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Best spot weld drill bit for a job you can name

Updated: October 2026

You want a best spot weld drill bit for a job you can name, and sorting by stars will not name it. A 4.5 from two reviews can sit above a named 8 mm bit with 192 reviews if the page only ranks the star. This short list uses the amazon.co.uk listings on our [spot weld drill comparison](/hub/drilling-and-accessories/spot-weld-drill): one solid bit, crown kits, and packs you should not treat as the cutter. Best here means the listing whose stated job matches yours, among these twelve shelves. The Products Compared editorial team did not run a workshop trial. A qualifying purchase can earn a commission at no extra cost to you.

You want a best spot weld drill bit for a job you can name, and sorting by stars will not name it. A 4.5 from two reviews can sit above a named 8 mm bit with 192 reviews if the page only ranks the star.

Our top picks

Sealey Sealey AK4734 8 mm spot weld drill

Best overall

Sealey Sealey AK4734 8 mm spot weld drill
8.6/10about £7.99
View offer
Topcloud Topcloud 9-piece 3/8 inch spot weld cutter

Alternative

Topcloud Topcloud 9-piece 3/8 inch spot weld cutter
8.1/10about £12.96
View offer
Gasea Gasea 6 mm and 8 mm spot weld bits

Best value

Gasea Gasea 6 mm and 8 mm spot weld bits
7.1/10about £7.79
View offer
On this page
  1. 1.Best for one 8 mm bit on ordinary panels
  2. 2.Best when you want spare crowns
  3. 3.What not to treat as the winner
  4. 4.If the panel is boron steel

Best for one 8 mm bit on ordinary panels

If you are drilling mild-steel panels and you want one bit, the conditional top pick in this set is the Sealey AK4734, about £7.99, with 4.6 from 192 reviews. Sealey's page states 8 mm, 80 mm overall, and HSS with 5% cobalt for galvanised and high-stress steels. It leads a single-bit job, not every job. UK reviews do not agree on life. Some estimate about 20 welds, about 40 to 50, or a whole restoration on the first bit. Others report a chip, a blunt edge after three, or a snap after three welds in steel they called 1.5 mm mild. A start hole stops the step point slipping. An Amazon surface field says Boron. The listing does not.

Best when you want spare crowns

A crown cuts a ring around the weld instead of milling the nugget flat. Two listings here are crown kits, and they are not the same buy. The BGS 1632, at about £16.92, prints 9.5 mm crowns, an 8 by 80 mm cobalt HSS drill, two pilot pins, and 700 to 2000 rpm. The star line is 4.5 from 444, and the written reviews are mostly headed outside the United Kingdom. The one UK-headed review says the set removed a sill. The pieces field says 1, against a ten-piece title. The Topcloud nine-piece kit, at about £12.96, has the larger UK review pile and no stated speed or millimetre size. The title says 3/8 inch. UK reviews name an MX-5, a Land Rover floor, and van panels, and they also describe walking and stripped threads. Choose Topcloud for that review pile. Choose BGS when you need 9.5 mm and 700 to 2000 rpm written down.
Sealey Sealey AK4734 8 mm spot weld drill

Testsieger

Sealey Sealey AK4734 8 mm spot weld drill
8.6/10about £7.99
View offer

What not to treat as the winner

A high star on a short count is not the top pick. Wjelet shows 4.6 from eight reviews: one spot-weld drill, two centre drills, and ten hole openers, at about £13.50. Eight ratings cannot outrank a named bit with 192 reviews. The Gosknor 12-piece set mixes spot-weld bits with five hole saws, at about £16.99, with 1.0 from one review and no text. Heyung's only UK-headed text says the bits do not work. VBVOO's 4.5 from two reviews has no review text. Two stars without a job are how a thin listing looks like a winner.

If the panel is boron steel

None of the twelve listings is the boron bit. Sealey's AK4740 is an 8 mm solid carbide bit for ultra-high-strength steel, also known as boron steels, at a list price of £47.94. That ASIN is not in this comparison. The AK4734 high-stress line does not borrow that sentence. If the vehicle information names boron or ultra-high-strength steel, hand the flange to a body shop. Wielander+Schill ask for a tungsten-carbide bit on their own drill, which is not an HSS bit from this shelf.

Common questions

Which listing is the sensible single bit for mild-steel panels?
In this set, the Sealey AK4734, at about £7.99 with 4.6 from 192 reviews. It is an 8 mm HSS bit with 5% cobalt claimed, 80 mm long on Sealey's page. UK reviews split on life, from a full restoration on one bit to a snap after a few welds. It is the top pick only for that single-bit job, and only with a start hole.
Who is the BGS 1632 for, given one UK write-up under 444 stars?
For you if you want 9.5 mm double-ended crowns, an 8 by 80 mm cobalt drill, two pilot pins, and a printed speed of 700 to 2000 rpm, at about £16.92. The one UK-headed review says a sill came off. Do not read 4.5 from 444 as 444 British jobs. The pieces field says 1, against a ten-piece title.
Why is 4.6 from eight reviews not the top pick?
Because eight reviews are a short file, and on Wjelet they sit on a mixed pack: one spot-weld cutter, two centre drills, and ten hole openers. Eight stars do not turn hole openers into spare crowns. The top pick in this set is the job match, not the highest star on the shortest count.
Which two listings should you skip if you wanted only cutters?
Wjelet, because ten of the thirteen pieces are hole openers, and the Gosknor 12-piece set, because five of the twelve pieces are hole saws, at about £16.99 with 1.0 from one review and no text. Heyung is a third poor fit: the only UK line says the bits do not cut.
What do you buy if the steel is boron?
Not one of these twelve. Sealey's AK4740 is the maker's 8 mm carbide bit for ultra-high-strength steel, also called boron, at a list price of £47.94, and it is outside this comparison. If you cannot confirm the steel, or the flange is structural, a body shop is the stop.

Related pages

Spot weld drill buying guide

Spot weld cutter vs bit

How to use a spot weld drill

Spot weld drill

Drill spot welds on a car panel and know the limit

Sources

Public UK sources used for this comparison. Listing prices are from amazon.co.uk on 15 October 2026.

  1. Laser Tools — spot weld cutters and drills (retrieved 15 October 2026)
  2. Sealey AK4734 HSS cobalt spot weld drill bit 8 mm (retrieved 15 October 2026)
  3. Mig Tig Arc — 8 mm spot weld drill bit (retrieved 15 October 2026)
  4. HSE — PUWER overview (retrieved 15 October 2026)
  5. HSE EIS16 — glove entanglement (retrieved 15 October 2026)
  6. HSE — using the right type of PPE (retrieved 15 October 2026)
  7. Consumer Rights Act 2015, section 9 (retrieved 15 October 2026)
  8. GOV.UK — General Product Safety Regulations 2005, Great Britain (retrieved 15 October 2026)