Home restorer
You are separating wings, floors, and brackets, and you will centre-punch and stop when the top sheet releases. A named 8 mm solid bit matches ordinary panel welds better than a box of hole saws.
Spot weld drill comparison 2026
The best spot weld drills, compared.
Top pick: Sealey AK4734 8 mm spot weld drill – Named 8 mm by 80 mm bit, 4.6 from 192 reviews, and a 5% cobalt claim for galvanised and high-stress panels. Best value: Gasea 6 mm and 8 mm spot weld bits – 6 mm and 8 mm at about £7.79, with 4.4 from 57 reviews and a 5% cobalt claim. Updated October 2026.
Charlie White (Charlie DIYte)Expert source
A spot weld drill is a drill-mounted cutter for releasing factory spot welds in sheet metal, usually a car panel, so you can separate a skin without automatically drilling through the flange. An annular crown on a spring pin cuts a ring and leaves a button. Check a millimetre diameter, a real 5% cobalt sentence rather than a gold coat, spare faces, and a box of cutters rather than hole saws. Stars, prices, and any weld count are from the UK listing. If the metal is stainless sheet rather than a painted body panel, look at a [stainless steel drill bit](/hub/drilling-and-accessories/stainless-steel-drill-bit) instead. These cutters are not a general drill for stainless. Laser describes both as different tools: a 9.5 mm crown, and an 8 mm HSS bit with 5% cobalt.
A spot weld drill is a drill-mounted cutter for releasing factory spot welds in sheet metal, usually a car panel, so you can separate a skin without automatically drilling through the flange.
42 products checked · 64 hrs invested · +18,600 readers
12 of 12: Best spot weld drills compared
Swipe for more
1-2 of 12Best overall
Best value
8.5/10
6.1/10
8.0/10
7.5/10
5.5/10
8.1/10
7.1/10
5.9/10
6.0/10
5.8/10
4.1/10
1.8/10
∼ £8
∼ £14
∼ £17
∼ £13
∼ £8
∼ £13
∼ £8
∼ £11
∼ £7
∼ £13
∼ £11
∼ £17
4.6(192)
4.6(8)
4.5(444)
4.5(60)
4.5(2)
4.4(401)
4.4(57)
4.2(6)
4.1(8)
3.9(26)
3.4(3)
1.0(1)
Personal buying guide
Which spot weld drill fits this job?
Question 1 of 2
What are you trying to separate?
The best spot weld drills in detail
Our view
The Sealey AK4734 is one 8 mm solid bit, 80 mm long in the listing specifications, listed at about £7.99. The amazon.co.uk listing shows 4.6 from 192 reviews. The listing states HSS with 5% cobalt for most common vehicle panels, including galvanised and high-stress steels. UK reviewers often estimate the edge still cutting after about 20 welds, about 40 to 50, or more than 50, and one finished a large restoration without opening a second bit. Other UK reviews report a chipped edge after a few welds, a blunt bit after three, or a snap after three welds in what that reviewer called 1.5 mm mild steel. UK reviewers say a start hole stops the step point slipping, and they mention a cordless drill for control. The Amazon surface field says Boron, which the listing does not, so that line is not a boron method. In this comparison it is the top pick when you want a single named 8 mm bit, with that life split left in the open.
Pros
- Named AK4734 bit, 8 mm by 80 mm in the listing, with HSS and 5% cobalt claimed
- 4.6 from 192 reviews on the amazon.co.uk listing
- UK reviews include restorations finished on one bit and estimates of about 20 to 50-plus welds
- Step point, with UK reviews saying a start hole stops it slipping
Cons
- Several UK reviews report a chipped, blunt, or snapped edge after only a few welds
- One diameter only, so there is no second size in the box
- The Amazon surface field says Boron and the listing does not
- The dimension table conflicts with the 80 mm length in the listing
Best for: Ordinary vehicle panels where you want one named 8 mm solid bit and you already punch a start hole. UK reviews include classic-car rebuilds.
Less suitable: Jobs that need several diameters, spare crowns, or a boron-steel method. The listing does not state a speed.
Specifications
- Model
- Sealey AK4734 8 mm spot weld drill
- Brand
- Sealey
- Price
- ∼£8
- Customer rating
- 4.6/5(192)
- Type
- Solid bit
- Diameters
- 8 mm
- Material claim
- HSS with 5% cobalt
- Pieces
- 1
- Guide or centre
- Step point
- Spares
- No
- Kit contents
- Single bit
- Shank
- Round
- Weight
- 30 g
Common questions
What length is the AK4734?
The listing says 80 mm. An Amazon dimensions cell of 14 x 124 x 165 mm conflicts with that length. Use 80 mm from the specification line.
Does the listing say boron steel?
The listing says galvanised and high-stress steels. An Amazon surface cell says Boron. The product text does not.
Do UK reviews agree on how long it lasts?
Some UK reviews report tens of welds, or a whole job on one bit. Others report a chip, a blunt edge, or a snap after about three welds. Both are on the listing.
Our view
The Wjelet pack is listed at about £13.50 with 4.6 from 8 reviews, and the listing describes 13 pieces: one 3/8 inch spot-weld drill, two centre drills, and ten hole openers. The cutting diameter is stated as 9.53 mm. The spot-weld tool is uncoated high-speed steel with a hex shank and a double-sided blade claimed. The included-components field says NO, which clashes with that pack list. One UK reviewer reports at least 20 spot welds on one side of the bit and was happy with the cut. Another says the pieces match unnamed top brands they have used. The same UK text says it is easy to drill into the panel behind the weld if you go too far. Ten of the thirteen pieces are hole openers, so most of the price is not a spare cutter.
Pros
- Cutting diameter stated as 9.53 mm, with a hex shank
- Double-sided blade claimed on the spot-weld tool
- One UK review reports at least 20 spot welds on one side of the bit
- Two centre drills are in the listing if you want a start hole from the same pack
Cons
- Ten of the 13 pieces are hole openers, not spot-weld cutters
- Only eight reviews, and the UK text is two reviews
- The included-components field says NO against the listing pack list
- One UK review says it is easy to drill into the panel behind the weld
Best for: A small number of 9.53 mm spot welds when you also want hole openers in the same box and you will watch the depth.
Less suitable: Anyone who wanted a set of spare spot-weld crowns, a cobalt bit, or a star line backed by more than eight reviews.
Specifications
- Model
- Wjelet 13-piece spot weld and hole-opener set
- Brand
- Wjelet
- Price
- ∼£14
- Customer rating
- 4.6/5(8)
- Type
- Mixed kit
- Diameters
- 9.53 mm cutter
- Material claim
- Uncoated HSS
- Pieces
- 13
- Guide or centre
- Double-sided blade
- Kit contents
- Mixed with hole saws
- Shank
- Hex
- Weight
- 80 g
Common questions
Are all 13 pieces spot-weld bits?
No. The listing says one 3/8 spot-weld drill, two centre drills and ten hole openers.
Does it include a case?
A case is not stated on the listing.
What do the UK reviews warn about?
One UK review reports at least 20 welds on one side of the bit and says not to drill into the panel behind the weld.
Our view
The BGS 1632 is listed at about £16.92 with a UK star line of 4.5 from 444 ratings. The listing describes a 10-piece set: a 9.5 mm double-core milling cutter, an 8 by 80 mm cobalt HSS spot-weld drill, five double-ended 9.5 mm crowns, and two pilot pins. The pieces field says 1, which clashes with that list, so the listing contents are the ones used here. The listing states 700 to 2000 rpm, a band no other set in this comparison states. Written reviews on the page are mostly headed outside the United Kingdom, and the one UK-headed review says the set removed a sill and worked well. There is no UK-headed criticism on the listing, and weld counts from other countries are not used. Crown steel beyond the cobalt line on the solid drill is not stated. You are paying about £16.92 for the stated speed, the pins, and the spare crowns, not for a pile of British job reports.
Pros
- 9.5 mm double-ended crowns plus an 8 by 80 mm cobalt HSS drill
- Two pilot pins in the listing contents
- Stated speed of 700 to 2000 rpm, unique in this comparison
- 4.5 from 444 on the UK star line, with one UK review of a sill removal
Cons
- Only one UK-headed review is on the listing, so the written record is thin
- The pieces field says 1 while the title and listing say 10 pieces
- Crown steel grade beyond the cobalt HSS drill is not stated
- Aluminium use and a storage case are not answered on the listing
Best for: A crown job where you want 9.5 mm heads, an 8 mm cobalt drill, pilot pins, and a speed printed on the listing.
Less suitable: Buyers who want a long file of UK-headed reviews, or a lower price for a single 8 mm bit.
Specifications
- Model
- BGS 1632 10-piece spot weld drill set
- Brand
- BGS
- Price
- ∼£17
- Customer rating
- 4.5/5(444)
- Type
- Crowns plus solid drill
- Diameters
- 9.5 mm crowns, 8×80 mm
- Material claim
- Cobalt HSS on 8 mm drill
- Pieces
- 10
- Guide or centre
- 2 pilot pins
- Spares
- 5 double-ended crowns
- Stated speed
- 700–2000 rpm
- Kit contents
- Cutter kit
- Shank
- Straight
- Weight
- 200 g
Common questions
What speed does BGS state?
The listing says 700 to 2000 rpm for this set. That figure is not printed on the other listings in this comparison.
Does the set include a case?
A storage case is not stated on the listing.
Are the 444 reviews all from the UK?
The UK page shows 4.5 from 444. One review is headed United Kingdom and describes a sill. The long weld-count stories are headed in other countries and are not UK evidence.
Our view
The Bohaner pair is a 6 mm bit at 66 mm overall and an 8 mm bit at 79 mm overall, listed at about £12.99 with 4.5 from 60 reviews. The listing claims high-speed steel with 5% cobalt, a step point, and separation of spot-welded vehicle panels without distorting the sheet. One UK reviewer says the bits centre on the spot-weld dimple after other sets wandered, and estimates 80 to 90 spots on a restoration with the bits still working. Another used them to release a Mini quarter panel. Two UK reviews go the other way: dull after three spot welds, and soft metal that blunts every two or three welds, with the line that this is no HSS. No certificate on the listing settles that material dispute. At about £12.99 the pair costs more than other 6 mm and 8 mm cobalt claims in this set, so the stated lengths are the clear extra.
Pros
- Stated lengths: 6 mm by 66 mm and 8 mm by 79 mm
- Listing claims HSS with 5% cobalt and a step point
- One UK review estimates 80 to 90 spots on a restoration with the bits still working
- UK reviews include a Mini quarter panel and bits that centred after other sets wandered
Cons
- One UK review says dull after three spot welds
- Another calls the metal soft and not HSS, blunting every two or three welds
- About £12.99 is above other 6 mm and 8 mm pairs in this set
- No certificate on the listing resolves the material claim
Best for: Vehicle panels where you want a 6 mm and an 8 mm bit with the overall lengths printed, and you can live with a split UK record on edge life.
Less suitable: A buyer who needs the lowest price for two sizes, or a proved cobalt certificate rather than a listing sentence.
Specifications
- Model
- Bohaner 6 mm and 8 mm cobalt spot weld bits
- Brand
- Bohaner
- Price
- ∼£13
- Customer rating
- 4.5/5(60)
- Type
- Solid bits
- Diameters
- 6 mm and 8 mm
- Material claim
- HSS with 5% cobalt
- Pieces
- 2
- Guide or centre
- Step point
- Kit contents
- Bits only
- Shank
- Straight
- Weight
- 50 g
Common questions
What are the stated lengths?
The listing says 6 mm by 66 mm and 8 mm by 79 mm.
Is the cobalt claim agreed by reviews?
The listing says 5% cobalt. One UK review says the metal is soft and is not HSS. There is no certificate on the listing.
What job do UK reviews name?
One reviewer estimated 80 to 90 spots on a restoration. Another used the bits on a Mini quarter panel. Two reviews report a dull edge after about three welds.
Our view
The VBVOO set lists three solid bits at about £7.59, sized 6.5 mm, 8 mm, and 10 mm, with an overall length of 46 mm in the listing. The listing claims HSS with cobalt content, a titanium coating, and a self-centring tip, and it names door skins, quarter panels, and boot lids as the reason for the three sizes. The cobalt percentage is not stated. The amazon.co.uk star line is 4.5 from two reviews, and the listing contains no review text, so there is no UK account of how many welds a bit survived. The set-name field says 8 Piece 2mm Hex Drill Bit Set, which clashes with the title and the piece count of three. The size line also prints 10 mm as 3/8 inch, and 10 mm is not 3/8 inch. A straight shank is claimed to fit most corded and cordless drills.
Pros
- Three diameters claimed: 6.5 mm, 8 mm, and 10 mm
- Overall length of 46 mm stated in the listing
- Self-centring tip, cobalt content, and a titanium coating claimed
- Straight shank claimed for most corded and cordless drills
Cons
- Only two reviews, and no review text on the listing
- Cobalt percentage is not stated
- The set-name field describes a different 8-piece 2 mm hex set
- 10 mm is equated with 3/8 inch, which is the wrong conversion
Best for: A door skin, quarter panel, or boot lid where you want three short solid bits and you are willing to judge them yourself, because no review text is on the listing.
Less suitable: Anyone who wants a proved edge life, a cobalt percentage, or a listing whose set-name matches the title.
Specifications
- Model
- VBVOO 3-piece cobalt HSS spot weld bits
- Brand
- VBVOO
- Price
- ∼£8
- Customer rating
- 4.5/5(2)
- Type
- Solid bits
- Diameters
- 6.5, 8 and 10 mm
- Material claim
- HSS, cobalt, Ti coat
- Pieces
- 3
- Guide or centre
- Self-centring tip
- Kit contents
- Bits only
- Shank
- Straight
- Weight
- 10 g
Common questions
Does the set include a case?
A case is not stated on the listing.
Will it cut aluminium?
Aluminium is not answered on the listing. The text names common steel body panels.
Why does the set name mention a 2 mm hex set?
The set-name field says an 8-piece 2 mm hex set. The title, piece count and included-components line say three spot-weld bits at 6.5, 8 and 10 mm. Use the title.
Our view
The Topcloud kit is a nine-piece annular cutter sold as 3/8 inch, listed at about £12.96 with 4.4 from 401 reviews. A millimetre diameter is not in the spec table, and the steel is described only as high quality, with no grade and no cobalt claim. Double-sided blades are claimed. UK reviews name MX-5 panels, a Land Rover floor, van wings, and a van bracket. One reviewer was still on the first cutter after about 60 welds, including awkward angles, and another moved to a third collet after an estimated 200-plus welds in steel of at least 1 mm. The same UK texts say the cutter walks unless you centre-punch or drill a small pilot, that hard pressure makes the teeth brittle, and that too much pressure cuts both panels. More than one UK review reports a stripped arbor thread. One order arrived with no drill bit, one shaft arrived bent, and a VW T6.1 bracket needed three heads for eight welds because the welds were larger than the cutter.
Pros
- Nine-piece cutter kit at about £12.96 with double-sided blades claimed
- 4.4 from 401 reviews, with UK jobs named on cars and vans
- UK reviews include about 60 welds on one cutter and an estimated 200-plus across collets
- Spare cutter faces so a hobby job can continue after one face wears
Cons
- Cutter walks unless you centre-punch or drill a small pilot
- UK reviews report stripped arbor threads, a bent shaft, and one order with no drill bit
- Hard pressure is described as snapping teeth or cutting both panels
- No millimetre diameter, no steel grade, and no stated speed
Best for: Square-on spot welds in ordinary sheet where you want spare double-sided cutters and you will centre-punch before you start.
Less suitable: Welds larger than the cutter, cocked flanges, or any job that needs a stated millimetre size and a stated speed.
Specifications
- Model
- Topcloud 9-piece 3/8 inch spot weld cutter
- Brand
- Topcloud
- Price
- ∼£13
- Customer rating
- 4.4/5(401)
- Type
- Annular cutter kit
- Diameters
- 3/8 in, mm not stated
- Material claim
- Steel, grade not stated
- Pieces
- 9
- Guide or centre
- Guide pin in reviews
- Spares
- Double-sided blades
- Kit contents
- Cutter kit
- Weight
- 50 g
Common questions
Does the kit include a case?
A case is not stated on the listing.
Do you need a centre punch?
UK reviews say the cutter walks unless you centre-punch or drill a small pilot first.
What failed in UK reviews?
Stripped arbor threads, a bent shaft, brittle teeth, and cuts through both panels when the feed stays on. Other UK reviews report dozens of welds on one cutter.
Our view
The Gasea pair is listed at about £7.79 with 4.4 from 57 reviews. The listing claims a 6 mm bit and an 8 mm bit in HSS with 5% cobalt, for most common vehicle panels, including galvanised steel and high-strength steel. Lengths are not stated. Several UK reviews are one line, such as very good, awesome, or brilliant fit, and they do not name the panel. Two UK reviews are specific: about three uses on a classic Mini sill and then the bit was useless, and one bit went blunt before a single spot weld was drilled. The title spells cobalt as Cobale. A high-strength line in the listing is not a vehicle-maker approval, and a storage case is not stated. In this set it is the best value when you want those two diameters at the low end of the price band and you can send the bits back if the edge goes on the first panel.
Pros
- Two diameters, 6 mm and 8 mm, listed at about £7.79
- Listing claims HSS with 5% cobalt for common vehicle panels
- 4.4 from 57 reviews, a larger count than the other sub-£8 sets
- Straight shank on a two-piece set
Cons
- One UK review reports about three uses on a classic Mini sill, then a useless bit
- Another UK review says the bit was blunt before one spot weld was drilled
- Lengths are not stated, and the title spells cobalt as Cobale
- Many UK reviews are one line and do not describe the panel
Best for: A low-budget pair of 6 mm and 8 mm bits when you accept a mixed UK record and you do not need a stated length.
Less suitable: A structural sill, a boron panel, or any job where you need written lengths and a consistent edge life in the reviews.
Specifications
- Model
- Gasea 6 mm and 8 mm spot weld bits
- Brand
- Gasea
- Price
- ∼£8
- Customer rating
- 4.4/5(57)
- Type
- Solid bits
- Diameters
- 6 mm and 8 mm
- Material claim
- HSS with 5% cobalt
- Pieces
- 2
- Guide or centre
- Sharp tip claimed
- Kit contents
- Bits only
- Shank
- Straight
- Weight
- 40 g
Common questions
Which panel steels does the listing name?
The listing says most common vehicle panels, including galvanised steel and high-strength steel. That is a seller claim, not a vehicle-maker approval.
Is a case included?
A storage case is not stated on the listing.
What do the UK reviews say about life?
The listing shows 4.4 from 57 reviews. Two UK texts say the edge was gone after about three uses on a Mini sill, or before one weld was finished. Other UK texts are short praise with no job detail.
Our view
The JETHMA set is five uncoated high-speed steel bits with an 8 mm cutting diameter in the table, listed at about £11.49 and rated 4.2 from six reviews. The surface field names metal, steel, and aluminium, and the listing claims the set can separate a spot-welded panel without twisting the sheet. Other diameters are not stated, and a point style is not stated. Three UK-headed reviews are on the listing. One prefers these bits to a normal drill or to grinding. One calls them easy and says the weld came out without drilling both panels. One calls the five-pack cheap enough and also says they used about one bit every 10 spot welds. That ten-weld figure is one review, not a repeated pattern, and no UK text on the listing reports a snap.
Pros
- Five 8 mm bits so a blunt one has a spare in the box
- Uncoated HSS, with aluminium named on the surface field
- One UK review preferred them to a normal drill bit or to grinding
- One UK review says the weld came out without drilling both panels
Cons
- One UK review reports about one bit every 10 spot welds
- Only six reviews, three of them UK-headed text
- One diameter only, and no point style is stated
- No stated speed and no cobalt claim
Best for: Car-panel spot welds around 8 mm where you want several plain HSS bits and you expect to change bit as the edge goes.
Less suitable: A long restoration on one edge, a 6 mm weld, or a buyer who wants a cobalt percentage in the listing.
Specifications
- Model
- JETHMA 5-piece 8 mm HSS spot weld bits
- Brand
- JETHMA
- Price
- ∼£11
- Customer rating
- 4.2/5(6)
- Type
- Solid bits
- Diameters
- 8 mm
- Material claim
- Uncoated HSS
- Pieces
- 5
- Spares
- Five bits
- Kit contents
- Bits only
- Shank
- Straight
- Weight
- 80 g
Common questions
Does the listing claim aluminium?
Yes. The surface field says metal, steel and aluminium, and the listing repeats aluminium among other metals.
Can you stop before the second panel?
One UK review says the bits drill the weld without going through both panels. That is one review, not a guarantee.
How long did a UK reviewer say one bit lasted?
One UK review says about one bit every 10 welds. Another prefers them to grinding. The star line is 4.2 from 6 reviews.
Our view
The Gainsten set is three solid bits at about £7.48, and the amazon.co.uk listing shows 4.1 from eight reviews. The listing gives 6.5 mm, 8 mm, and 10 mm in high-speed carbon steel, with a titanium nitride finish and a brad point for starting the hole. The same text limits the bits to spot welds on most common vehicle panels, including galvanised and high-stress steels, and says they are not for other drilling. Two of the three UK-headed reviews say the bits did the job, and one of those says they hold an edge. The third UK review says the edge was blunt after two spot welds. No cobalt percentage is stated, and the size line prints 10 mm as 3/8 inch even though 3/8 inch is 9.525 mm. The model-number field says left-handed, but the title and the rest of the listing do not, so this set is not treated as a reverse bit.
Pros
- Three stated diameters: 6.5 mm, 8 mm, and 10 mm, at about £7.48
- Titanium nitride finish and a brad point claimed in the listing
- Straight shank, and the listing limits the bits to spot welds
- Two UK reviews say the bits did the job or held an edge
Cons
- One UK review reports a blunt edge after two spot welds
- Only eight reviews, with three short UK-headed texts on the listing
- 10 mm is printed as 3/8 inch, which is a wrong conversion
- The model field says left-handed and the listing bullets do not
Best for: A small panel job where you want 6.5 mm, 8 mm, and 10 mm solid bits in one cheap set and you can stop if the edge goes after a couple of welds.
Less suitable: Buyers who need a stated cobalt percentage, a confirmed left-handed bit, or a longer review history than eight ratings.
Specifications
- Model
- Gainsten 3-piece spot weld drill bits
- Brand
- Gainsten
- Price
- ∼£7
- Customer rating
- 4.1/5(8)
- Type
- Solid bits
- Diameters
- 6.5, 8 and 10 mm
- Material claim
- Carbon steel, TiN claimed
- Pieces
- 3
- Guide or centre
- Brad point claimed
- Kit contents
- Bits only
- Shank
- Straight
- Weight
- 20 g
Common questions
What sizes are in the Gainsten set?
The listing gives 6.5 mm, 8 mm and 10 mm. It also prints 10 mm as 3/8 inch. 3/8 inch is 9.525 mm, so that inch label does not match 10 mm.
Are these left-handed bits?
The model-number field says left-handed. The title and the rest of the listing do not. Treat left-hand use as not stated.
How are the UK reviews split?
The listing shows 4.1 from 8 reviews. Of the three UK texts, two say the bits did the job and one says they were blunt after two welds.
Our view
The Gosknor five-piece set is five 8 mm bits, also marked 5/16 inch, listed at about £12.99 with 3.9 from 26 reviews. The listing claims high-speed steel, a titanium coating, and a sharp centred design that minimises slipping, and it says the bits are for spot welds on vehicles, appliances, or metal sheet, not for other drilling. A length is not in the UK listing, and a case is not listed there. One UK review says a bit was still sharp after 40 welds. Another says one bit removed the welds the reviewer had expected to need more bits for. A third UK review calls the bit total rubbish and says it will not drill 1 mm steel. Those outcomes are not averaged into one life figure. Thick metal is an unanswered customer question, and five bits at this price sit beside cheaper single 8 mm bits that carry more UK text.
Pros
- Five 8 mm bits, also marked 5/16 inch
- Titanium coating and a centred tip claimed
- One UK review says still sharp after 40 welds
- Listing limits the bits to spot welds rather than general drilling
Cons
- One UK review says the bit will not drill 1 mm steel
- 3.9 from 26 reviews, below the stronger 8 mm listings
- Length is not stated in the UK listing, and a case is not listed
- About £12.99 for five bits with a split cutting record
Best for: Spot welds on thin vehicle or appliance sheet where you want several 8 mm coated bits and you can test the first one on a scrap flange.
Less suitable: Thick metal, which the listing does not answer, or a buyer who wants one named bit with a much larger UK review file.
Specifications
- Model
- Gosknor 5-piece 8 mm titanium spot weld bits
- Brand
- Gosknor
- Price
- ∼£13
- Customer rating
- 3.9/5(26)
- Type
- Solid bits
- Diameters
- 8 mm
- Material claim
- HSS, titanium coated
- Pieces
- 5
- Guide or centre
- Centred tip claimed
- Spares
- Five bits
- Kit contents
- Bits only
- Shank
- Straight
- Weight
- 45 g
Common questions
Will they cut thick metal?
Thick-metal capacity is not stated. The question is on the listing without an answer.
Is a case included?
The UK listing does not list a case. A case mentioned in a non-UK review is not part of this spec.
How do the UK reviews differ?
One UK review says still sharp after 40 welds. Another says the bit will not drill 1 mm steel. The star line is 3.9 from 26 reviews.
Our view
The Heyung set is five 8 mm solid bits, also printed as 5/16 inch, listed at about £10.99. The listing claims high-speed steel with a titanium-plated finish and a sharp centred design that minimises slippage, and it limits use to spot welds on vehicles, appliances, or thin sheet. Cobalt is not claimed. The amazon.co.uk line is 3.4 from three reviews. The only UK-headed review says the bits do not work and that the reviewer would rather use a piece of 8 mm bar. There is no UK praise on that listing, so a repeated fault pattern cannot be shown beyond one refusal to cut. Aluminium, and a question about whether the bits are easy to use, are unanswered. Five spare bits do not help if the first one does not cut the weld.
Pros
- Five 8 mm bits, also marked 5/16 inch, so the size is stated twice
- Titanium-plated finish and a centred tip claimed
- Listing limits use to spot welds on thin sheet
- Straight shank and a stated weight of 60 g
Cons
- The only UK review says the bits do not work
- 3.4 from three reviews, with no UK praise on the listing
- No cobalt claim
- Aluminium use is an unanswered customer question
Best for: Only a trial on scrap thin sheet if you already have the set, because the UK text does not show a finished weld.
Less suitable: A car panel you need to separate, or any buyer using the star line to choose a first spot-weld bit.
Specifications
- Model
- Heyung 5-piece 8 mm spot weld bits
- Brand
- Heyung
- Price
- ∼£11
- Customer rating
- 3.4/5(3)
- Type
- Solid bits
- Diameters
- 8 mm
- Material claim
- HSS, titanium-plated
- Pieces
- 5
- Guide or centre
- Centred tip claimed
- Spares
- Five solid bits
- Kit contents
- Bits only
- Shank
- Straight
- Weight
- 60 g
Common questions
Can these bits drill anything except a spot weld?
The listing says they are for spot welds only and not for other drilling.
Will they cut aluminium?
Aluminium is not stated. The question is on the listing without an answer.
What does the UK review say?
The only UK text says the bits do not work and that a plain 8 mm bar would be better. The star line is 3.4 from 3 reviews.
Our view
The Gosknor 12-piece set is listed at about £16.99 with 1.0 from one review, and the listing has no review text. The contents line is three spot-weld drill bits, two spot-weld drills, five hole saws, one Allen key, and one guide pin. The title names 6.5 mm, 8 mm, and 10 mm, and it equates 10 mm with 3/8 inch, which is not the same measurement. The listing claims high-speed steel, a double-sided hex shank, and a spring-loaded guide pin, plus thin stainless steel, iron, and aluminium sheet. Cobalt and a coating are not claimed, and a speed is not stated. A customer question about compatibility with all drills has no yes or no on the listing. Five of the twelve pieces are hole saws, so the pack is a mixed kit at the top of this price band with a single one-star rating and nothing written about a weld.
Pros
- Three diameters named in the title: 6.5 mm, 8 mm, and 10 mm
- A guide pin and an Allen key are in the contents line
- Double-sided hex shank and a spring-loaded guide pin claimed
- Listing names thin stainless, iron, and aluminium sheet
Cons
- 1.0 from one review, with no review text on the listing
- Five of the 12 pieces are hole saws
- About £16.99 is the top price in this set for an unreviewed mix
- 10 mm is equated with 3/8 inch, and drill compatibility is unanswered
Best for: Not a first buy for spot welds. The contents only suit you if you already wanted hole saws in the same box and you will judge the cutters yourself.
Less suitable: Anyone choosing a spot-weld cutter from stars, a cobalt bit, or a kit whose pieces are mostly crowns.
Specifications
- Model
- Gosknor 12-piece spot weld and hole-saw set
- Brand
- Gosknor
- Price
- ∼£17
- Customer rating
- 1.0/5(1)
- Type
- Mixed kit
- Diameters
- 6.5, 8 and 10 mm
- Material claim
- HSS
- Pieces
- 12
- Guide or centre
- Spring guide pin
- Spares
- Double-sided blades
- Kit contents
- Mixed with hole saws
- Shank
- Hex claimed
- Weight
- 113 g
Common questions
Does it fit every drill?
A universal fit is not stated. The listing claims a hex shank for grip and does not answer whether it fits every drill.
What metals does the listing name?
Thin stainless steel, iron and aluminium sheet. That is a listing claim.
Why is the rating 1.0?
The UK listing shows 1.0 from 1 review. There is no review text, so the reason is not stated.
How we compared
We compared 12 spot weld drills and cutters on amazon.co.uk and scored them from the listing facts in this set. Prices, stars, and review counts are the UK lines. There was no lab test. Public sources cover cutter geometry, eye protection, gloves near a rotating bit, and product safety. The five weights below sum to 100.
1
Geometry
25%A solid bit mills into the weld. A crown on a spring pin cuts a ring and leaves a button. Laser Tools treats those as different tools.
2
Diameter in millimetres
20%This set sells 6, 6.5, 8, 9.5 or 9.53, and 10 mm. Ten millimetres is not 3/8 inch (9.525 mm).
3
Material sentence
20%HSS with 5% cobalt is a stated percentage. A gold or titanium coat is a finish, not cobalt. A longer-life line in a listing is not a test.
4
True contents
20%The contents line has to be cutters, pins, and crowns. A 13-piece title can still be mostly hole openers.
5
UK review evidence
15%Stars and counts are the amazon.co.uk lines. Only reviews headed in the United Kingdom count as UK opinion. A weld count is that reviewer's estimate.
Independent review
Last updated: October 2026
8 sources checked
Spot weld drill buying guide
A spot weld drill only earns its place if the diameter, the material sentence, and the box contents match the panel in front of you. The notes below follow the order used for these twelve listings. Size, cobalt wording, and true contents are set out in the [spot weld drill buying guide](/hub/drilling-and-accessories/spot-weld-drill/sub/spot-weld-drill-buying-guide).
What is a spot weld drill?
A spot weld drill is a drill-mounted cutter for releasing factory spot welds in sheet metal, usually a car panel, so you can separate a skin without automatically drilling through the flange. A solid bit mills into the nugget. An annular crown on a spring pin cuts a ring and leaves a button. Laser Tools describes both as different tools: a 9.5 mm crown, and an 8 mm HSS bit with 5% cobalt. No ASIN in this set is a pneumatic spot-weld drill. Diameter is in millimetres.
Best for
- Home restorers separating wings, floors, and brackets
- A one-off bracket where one named 8 mm bit is enough
- A workshop that wants spare crowns and a stated speed
Not ideal for
- A structural joint, or steel identified as boron or ultra-high-strength
- A weld near fuel, brakes, or an airbag
- A flange already torn that still has to carry load
Mistakes to avoid
- 1
No centre punch
UK reviews of crown cutters say the tool walks unless you centre-punch or drill a small pilot. A step-point bit also slips less after a start hole. Punch, then stop when the top sheet releases.
- 2
Reading the piece count as cutters
Wjelet's 13-piece line is one spot-weld drill, two centre drills, and ten hole openers. The Gosknor 12-piece box includes five hole saws. Use the contents line, not the number in the title.
- 3
Copying one speed onto every bit
BGS 1632 states 700 to 2000 rpm. That band is not printed on the other listings. A gold coat, or a Boron cell that the Sealey text does not repeat, is not a test of the steel.
What to weigh up
Geometry and diameter
HighStart with the shape of the cutter, then the millimetre size. A solid bit with a flat or step face mills into the nugget. A 9.5 mm-class crown on a spring pin cuts around it and leaves a button. Laser Tools describes both as different tools, and this set has both: the Sealey AK4734 is one 8 mm solid bit, Topcloud is a nine-piece cutter titled 3/8 inch, and BGS 1632 states 9.5 mm crowns plus an 8 by 80 mm drill. The diameters actually sold here are 6, 6.5, 8, 9.5 or 9.53, and 10 mm.
Material sentence and true contents
HighRead the material line as a sentence, not as a colour. HSS with 5% cobalt is what Sealey writes for the AK4734, and Gasea and Bohaner use the same 5% wording. A titanium or gold coat is a finish. VBVOO claims cobalt content and does not state a percent. Gainsten's longer-life line is a listing claim, not a test. One UK Bohaner review calls the metal soft. There is no certificate on that listing to settle it. Then count what is actually in the box.
Which option suits you?
Three typical situations, each with a recommendation from this comparison.
Two sizes on a low budget
You want 6 mm and 8 mm in one cheap pair and you can return the bits if the edge goes on the first panel. Lengths are not stated on this listing.
Workshop wanting spare crowns
You want 9.5 mm heads, an 8 mm cobalt drill, pilot pins, and a speed printed on the listing. A bullet is still not approval for press-hardened steel.
Common questions about spot weld drills
Which spot weld drill is the top pick in this set?
The top pick for one named 8 mm solid bit is the Sealey AK4734, 80 mm long in the listing, at about £7.99. The amazon.co.uk line is 4.6 from 192 reviews, and the listing claims HSS with 5% cobalt for galvanised and high-stress vehicle panels. UK reviews include restorations finished on one bit and bits that chipped or snapped after a few welds. It is one diameter, not a multi-size kit.
How much does a spot weld drill cost on amazon.co.uk?
On these twelve amazon.co.uk shelves the prices run from about £7.48 to £16.99, checked on 15 October 2026. Entry, about £7.48 to £7.99, is Gainsten, VBVOO, Gasea, and Sealey. The middle, about £10.99 to £13.50, is Heyung, JETHMA, Topcloud, Bohaner, the Gosknor five-piece, and Wjelet. BGS 1632 is about £16.92 and the Gosknor 12-piece is about £16.99. These bands are this set, not a market census.
Should I buy a solid spot weld bit or a crown cutter?
A solid bit mills into the weld nugget. A crown on a spring pin cuts a ring and leaves a button. Laser Tools describes those as different tools. Sealey AK4734 is an 8 mm solid bit. Topcloud is a nine-piece cutter titled 3/8 inch, and BGS 1632 states 9.5 mm crowns plus an 8 by 80 mm cobalt drill. Use the solid bit for one ordinary panel weld, and a crown set when you want spare faces.
What does a 5% cobalt claim mean on a spot weld drill?
HSS with 5% cobalt is the sentence Sealey writes for the AK4734. Gasea and Bohaner use the same 5% wording. A gold or titanium coat is a finish, not a cobalt percentage. VBVOO claims cobalt content without a percent. No certificate in these listings settles a review that calls the steel soft. Treat the sentence as a listing claim. The Consumer Rights Act 2015, section 9, judges quality against the description and the price.
Do I need to centre-punch before I drill a spot weld?
Centre-punch the weld, or drill a small pilot. UK reviews say the Topcloud cutter walks if you do not. The Sealey AK4734 step point also slips less after a punch. Stop when the top sheet releases. The punch, and where a body shop should take over, is in how to centre-punch a spot weld. Keep gloves off the hand next to a rotating bit, and wear eye protection.
Is a 13-piece spot weld set thirteen spot weld bits?
No. Wjelet's 13-piece line is one 3/8 inch spot-weld drill, two centre drills, and ten hole openers, at about £13.50. The Gosknor 12-piece box lists three spot-weld bits, two spot-weld drills, five hole saws, an Allen key, and a guide pin. BGS 1632 describes 9.5 mm crowns, an 8 mm cobalt drill, and two pilot pins. Read the contents line, not the piece count in the title.
Will these spot weld bits drill boron or press-hardened steel?
Do not treat these bits as a boron or press-hardened method. Sealey says galvanised and high-stress steels, not boron. An Amazon surface cell on the AK4734 says Boron, and the listing does not, so that cell is a table clash. Mig Tig Arc's note on the 8 mm bit is mild steel, not boron. Call a body shop for a structural joint, steel identified as boron or ultra-high-strength, a weld near fuel, brakes, or an airbag, or a torn flange that still has to carry load.
What drill speed should I use for a spot weld?
The only stated speed in this comparison is BGS 1632 at 700 to 2000 rpm. That figure is not printed on the other listings, so do not copy it onto a different bit. Slow to medium is Mig Tig Arc's wording for the Sealey 8 mm bit, not a number you can transfer. UK Sealey reviews mention a cordless drill when they want control, and they stop when the top sheet releases.
Our verdict
Across these twelve amazon.co.uk listings, the top pick for one named 8 mm solid bit is the Sealey AK4734: about £7.99, 4.6 from 192 reviews, 80 mm in the listing, and HSS with 5% cobalt claimed for galvanised and high-stress steels. UK reviews still split between long restorations and an edge that chips, blunts, or snaps after a few welds. The best value is the Gasea 6 mm and 8 mm pair at about £7.79, with 4.4 from 57 reviews and a 5% cobalt claim, if you can send the bits back when the edge goes on the first panel. Crown kits such as Topcloud and BGS 1632 are the route when you want spare faces rather than a cheaper solid bit.
Best overallView offer
Sealey AK4734 8 mm spot weld drill
Named 8 mm by 80 mm bit, 4.6 from 192 reviews, and a 5% cobalt claim for galvanised and high-stress panels.
Best value
View offer
Gasea 6 mm and 8 mm spot weld bits
6 mm and 8 mm at about £7.79, with 4.4 from 57 reviews and a 5% cobalt claim.
Editorial
Editor
Spot weld drillsCar panel toolsamazon.co.uk listings
Products Compared publishes British-English buying guides based on amazon.co.uk listings and public UK sources. We do not run a lab and we do not invent test scores.
Updated: October 2026
8 sources checked
Guides to spot weld drills
Guides on what to look for, how to use a product, and common mistakes.
Best spot weld drillWho a single 8 mm bit, a crown set, or a mixed kit is for.Spot weld drill buying guideGeometry, millimetre size, the cobalt sentence, and true contents.Spot weld drill for car panelsWings, sills, floors, brackets, and the structural limit.Spot weld cutter vs bitWhen a crown fits, when a solid bit fits, and one conditional pick.How to use a spot weld drillPunch, slow feed, stop at the first sheet, then the body-shop handoff.
Related comparisons
Sources
Public UK sources used for this comparison. Listing prices are from amazon.co.uk on 15 October 2026.
- Laser Tools — spot weld cutters and drills (retrieved 15 October 2026)
- Sealey AK4734 HSS cobalt spot weld drill bit 8 mm (retrieved 15 October 2026)
- Mig Tig Arc — 8 mm spot weld drill bit (retrieved 15 October 2026)
- HSE — PUWER overview (retrieved 15 October 2026)
- HSE EIS16 — glove entanglement (retrieved 15 October 2026)
- HSE — using the right type of PPE (retrieved 15 October 2026)
- Consumer Rights Act 2015, section 9 (retrieved 15 October 2026)
- GOV.UK — General Product Safety Regulations 2005, Great Britain (retrieved 15 October 2026)
Expert source (DIY & tools): Charlie White (Charlie DIYte) (external profile) – public expert commentary used as a research source, not as a contributor to our pages.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars, and review counts are the UK listing lines. We did not run a lab test.