The best decking screws, compared.
Top pick: HOME IT A4 6 x 100 mm Best value: TIMCO Classic 4.5 x 70 mm – Cheapest box of 200 that reaches 70 mm without a bent-batch pattern, at about £8.50. Updated October 2026.
Decking screws hold timber deck boards to joists. This amazon.co.uk shelf also includes heavier hex frame screws for posts and sleepers, and those are a different fixing. Most packs here are green-coated carbon steel, 4.5 mm, in boxes of 200. Judge a pack by metal and exposure, a drive that survives the driver you already own, and a length of at least 2.5 times the board thickness, with two screws at each joist crossing. The [decking screws buying guide](/hub/screws-and-accessories/decking-screws/sub/decking-screws-buying-guide) sets length, metal, drive and pack before a shortlist. A decking screw fixes a timber board to a joist. Their metal-fixings note gives 50 mm screws for 20 mm boards and 75 mm for 30 mm boards.
Decking screws hold timber deck boards to joists. This amazon.co.uk shelf also includes heavier hex frame screws for posts and sleepers, and those are a different fixing.
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Personal buying guide
Question 1 of 2
What are you fixing?
HOME IT's pack is the only A4 stainless option in this set, with 50 countersunk TX20 wood screws for £13.49 and a listing aimed at decking and timber cladding. A4 (316-type) is the grade BSSA names for chloride exposure, so on paper it suits coastal decks and oak better than any green screw here. The size is unclear: the title says 6 x 100 mm, while the size and diameter fields say 4.2 x 55 mm. The 4.9 stars come from 13 reviews, and none of the saved texts is labelled United Kingdom; several are German or describe other kits. One of those texts says some 4.2 x 55 mm screws were not straight. No driver bit is listed. Check the size on the live listing before you order.
Pros
Cons
Best for: Coastal, estuarine or oak decks where you need A4 stainless and can confirm the size first.
Less suitable: Inland softwood decks on a budget, and buyers who need UK review evidence before they order.
Specifications
Common questions
Are these A4 or a coated steel?
The material field says A4 stainless steel (AISI 316). The finish field says blank.
Which size should you trust?
The title and size field say 6.0 x 100 mm. The thread-size and fastener-size fields say 4.2 x 55 mm, and the diameter field says 4.2 mm.
Are the review texts from the UK?
The listing line is 4.9 from 13. The review prose in the extract is not labelled United Kingdom.
AJ Timber's 200 mm hex screws are frame fixings, not deck-board screws: 50 green M6 coach screws with an 8 mm hex head and fixed washer for £27.49. They hold 4.8 stars from 580 amazon.co.uk reviews, the highest star line among packs with hundreds of reviews. UK buyers use them for joists to posts, railway sleepers, raised beds, retaining walls and a pergola, and several are on their second or third box. One reviewer reports no corrosion after more than three years. They will not self-drill full depth through oak sleepers, and reviewers recommend a pilot smaller than the shank plus an impact driver. The bullet does not list a bit, and buyers disagree about whether one arrived. The 1,000-hour salt-spray claim is a test figure, not a life in years.
Pros
Cons
Best for: Sleeper beds, retaining walls, joist-to-post joints and pergolas built from treated softwood.
Less suitable: Fixing deck boards, oak sleepers without a pilot, and coastal frames that need stainless.
Specifications
Common questions
Are these deck-board screws?
The title calls them decking frame fixing screws, 200 mm, and the fastener type is coach screw. UK reviews use them on posts and sleepers.
What corrosion claim is printed?
The bullet says the plating withstands up to 1,000 hours salt spray in accordance with BS EN 9227:2012.
Does the 50-pack bullet include a driver bit?
No. Some UK reviews say a bit arrived and one says the advertised bit was missing.
This ForgeFix box puts 200 green 4.5 x 60 mm Pozi screws into a typical inland softwood deck for £5.84, about 3p a screw. Across 2,831 amazon.co.uk reviews it holds 4.7 stars and ranks third in Decking & Fencing Hardware on the saved listing. UK buyers use it on new decks, on replacement boards and on general garden timber, and several say they came back for another box. The 60 mm length suits boards up to about 24 mm by the 2.5 times rule, and Egertons still puts 60 mm on 32 mm softwood when 25 mm reaches the joist. The recurring complaint is the Pozi recess: one or two heads strip when an impact driver meets a knot, while pre-drilled boards gave no trouble in one review. The spec table calls the head flat although the title says countersunk. It is coated carbon steel, so coastal decks and oak need stainless.
Pros
Cons
Best for: Inland decks on treated softwood boards up to about 32 mm, fixed with two screws per joist and a driver set to a sensible clutch.
Less suitable: Coastal decks, oak or other hardwood, hollow composite boards, or anyone who strips Pozi heads with a heavy impact driver.
Specifications
Common questions
What size is the ForgeFix DS4560 box?
The size field says 4.5 x 60 mm, the diameter fields say 4.5 mm, and the pack is 200 screws.
Which drive does the listing name?
The drive system field says Pozidriv, and the highlight says a countersunk Pozi drive. The head-type field says Flat.
Does the listing say they suit composite decking?
The raw file asks the question and does not answer it. UK reviews in the extract talk about timber decking.
The 50 mm ForgeFix box is the cheapest board screw here, with 200 green Pozi screws for £5.21 and 4.7 stars from 2,652 amazon.co.uk reviews. UK buyers mostly use it on fence slats, shiplap, trellis and light garden timber, and several drive it into softwood without a pilot hole. The length is the catch for decking: the TDCA rule of 2.5 times the board thickness makes 50 mm right for a 20 mm board, not the 28 to 32 mm boards most garden decks use. Reviews call the metal softer than other brands, and heads can chew up if the bit is worn. One buyer found a driver bit in the box and another did not, and the listing names only the screws. The material field says copper, which does not match the carbon-steel range.
Pros
Cons
Best for: Thin boards of about 20 mm, fence slats, trellis and repairs where a 50 mm screw already reaches 30 mm of joist.
Less suitable: Standard 28 to 32 mm deck boards, hardwood, coastal sites, or buyers who expect a bit in the box.
Specifications
Common questions
How long are these ForgeFix screws?
The size field says 4.5 x 50 mm and the pack contains 200.
What does the material field say?
It says Copper. The finish is green treated, and the highlight describes green anti-corrosive decking screws. Those lines disagree.
Is a driver bit in the box?
The included-components line names the screws, not a bit. One UK review says a bit was missing and another says a bit was in the box.
This is the 25-pack of the same AJ Timber 200 mm hex frame screw, at £15.99 with an 8 mm driver bit named in the bullet. It has 4.7 stars from 353 amazon.co.uk reviews. UK buyers use it on softwood sleepers of about 195 x 95 mm after a shallow pilot hole, and several used the supplied bit in an impact driver. It is not a deck-board screw, so do not use it for boards. One reviewer could not self-bore it through 250 mm of timber, and others ask whether a pilot is needed; the reviews say yes for heavy stock. At about 64p a screw it costs more per screw than the 50-box, which suits a small sleeper bed better than a full retaining wall.
Pros
Cons
Best for: A small sleeper bed, a step or a few joist-to-post fixings where 25 screws are enough.
Less suitable: Board fixing, large retaining walls where the 50-box is cheaper per screw, and oak without a pilot.
Specifications
Common questions
Does this box include a bit?
The bullet says a free 8 mm driver bit. UK reviews mention using that bit with an impact driver.
What hardness does the spec field show?
The item hardness field says Grade 8.8. The listing does not explain that label.
Will they self-bore thick timber?
One UK review says they will not self-bore through 250 mm. Other reviews use a shallow pilot in softwood sleepers.
The TIMCO Classic 70 mm box is the length most UK readers need for a 28 mm softwood board, with 200 green screws for £8.50. It has 4.7 stars from 197 amazon.co.uk reviews, and UK buyers use it to fix new decking and to replace old boards where the extra length pulled them down tight. Several reviews describe a fast, easy drive, and the 27 UK texts show no pattern of snapped heads or rust. One repeat buyer found the tips blunter than an earlier box, and another says you need a decent drill or bit. The listing does not name the drive type, so check the recess before you buy bits. A finish field says zinc although the title says exterior green. It costs about 1p more per screw than the ForgeFix 75 mm box, but the reviews report fewer batch faults.
Pros
Cons
Best for: New or replacement 28 mm softwood deck boards inland, fixed two to a joist with a good drill-driver.
Less suitable: Coastal decks, oak, composite boards, or buyers who need the drive type confirmed before ordering.
Specifications
Common questions
How long is 70TDECK?
The size and fastener-size fields say 4.5 x 70 mm, 200 screws.
Green or zinc?
The title says exterior green. A finish field says zinc. Both are in the raw file.
Why do reviewers mention length?
UK reviews say the extra length helped when replacing old decking boards.
ForgeFix's 75 mm box brings 200 green Pozi screws for £7.51, the length the TDCA gives for a 30 mm board. It holds 4.6 stars from 2,552 amazon.co.uk reviews, and the listing claims ribs under a double-countersunk head and an exterior organic coating. UK buyers report a smooth drive in softwood and no rust during garden work, mostly on fence rails and outdoor timber. Batch quality is the weak point: one review says about a quarter of a box bent and would not drive true, another calls it a poor batch, and one box came short. Several reviews say the Pozi recess is shallow and the bit jumps out. One buyer says they work better as a general outdoor screw than as a deck-board screw. If you have thick boards on an inland deck, check the first handful before you start a full run.
Pros
Cons
Best for: Thick 30 mm softwood boards, joist framing and fence rails inland, where a long coated Pozi screw is enough.
Less suitable: Buyers who want consistent batches, impact-driver users who strip Pozi heads, hardwood and coastal decks.
Specifications
Common questions
What length is DS4575?
The size field says 4.5 x 75 mm, in a box of 200.
What coating does the bullet claim?
An exterior-grade green organic coating against weather and the chemicals in pressure-treated timber.
What did UK reviews say about the heads?
Reviews describe a shallow Pozi recess, cam-out, stripped heads, and one batch in which many screws were bent.
TIMCO's Classic 4.5 x 50 mm box gives you 200 green exterior screws for £6.66 and has 4.6 stars from 529 amazon.co.uk reviews. The listing claims a 25° sharp point, a helix shank and ribs under the head, and UK buyers say it starts easily and blends into green-treated timber. One fence was still standing with no rust after about a year. The longer-term reviews are less kind: one buyer saw about 1 in 50 heads shear within a year, another noticed snapped screws when boards lifted, and one says the recess fails under an impact driver. Like the 50 mm ForgeFix, it only meets the 2.5 times rule on a board of about 20 mm. The spec table lists a #0-80 thread and a 60 g weight, neither of which fits a box of 4.5 mm screws.
Pros
Cons
Best for: Thin boards, fence work and light garden timber where you drive with a drill-driver rather than an impact driver.
Less suitable: Standard 28 to 32 mm deck boards, impact-driver users, and anyone who wants a long service record before buying.
Specifications
Common questions
What size is 50TDECK?
The size field says 4.5 x 50 mm and the piece count is 200. A thread-size field also says #0-80.
Does this listing state the drive?
The bullets name ribs, a helix shank, and a 25° point. They do not say Pozi or Torx.
What long-term fault shows up in UK reviews?
Reviews describe heads shearing, screws snapping, and a recess that fails with an impact driver.
Zynthor's pack holds 50 green 4.8 x 75 mm screws with a T25 star drive and a type-17 tip for £8.99, about 18p each. The highlight says a T25 bit is included, and the listing claims six ribs under the head and a serrated thread. It has 4.5 stars from 30 amazon.co.uk reviews, but only nine review texts exist, so there is little evidence about rust, snapping or cam-out. One UK buyer drove them without a pilot hole and was happy; another never received the parcel. The listing says you can drive without pre-drilling, while the TDCA still wants pilots at board ends and in hardwood. A pack of 50 covers only about 25 joist crossings at two screws each, so it suits a repair more than a new deck.
Pros
Cons
Best for: Small repairs or a few replacement boards where you want a Torx drive and do not need 200 screws.
Less suitable: A whole new deck, hardwood or coastal sites, or buyers who want a long review record.
Specifications
Common questions
Is a driver bit included?
The item highlight says a T25 star bit is included.
How many screws are in the pack?
The piece count is 50, at 4.8 x 75 mm.
Does the bullet say you must pre-drill?
It says the type-17 tail can be driven directly without pre-drilling. That is the listing claim.
METALLIXITY sells 200 #9 x 2-1/2 inch screws, roughly 63 mm, with a T25 drive, a type-17 cutter point and a Torx bit for £23.79. The 4.3 stars from 45 reviews mix United Kingdom, US and Canadian buyers, so only part of that record speaks for UK decks. UK reviewers used them on deck frames, feather-edge fencing and raised-bed sleepers, and some prefer the star drive to cross heads. One buyer received no bit and another expected 4 inch screws, because the listing carries several lengths. The unit count field says 100 while the title says 200. The 1,000-hour salt-spray line names no standard, and salt-spray hours do not predict years outdoors. At about 12p a screw it costs four times the ForgeFix boxes for a similar length.
Pros
Cons
Best for: Buyers who want a Torx-drive board or frame screw and accept a premium over coated Pozi boxes.
Less suitable: Budget decks, anyone who needs metric sizes confirmed, and coastal decks that need stainless.
Specifications
Common questions
What size does the title use?
The title and size field say #9 x 2-1/2 inch, not a millimetre size.
Is a Torx bit included?
The bullet says one Torx bit. One review says no Torx bit was supplied.
Are the written reviews all from the UK?
No. The extract includes United Kingdom, United States, and Canada.
Zynthor's hex screws are 6.7 x 63 mm green carbon-steel fixings with a washer head, sold in a pack of 50 with a socket driver bit for £12.99. The listing aims them at sleepers, fences, pergolas, raised beds and timber frames, and also mentions decking boards. There is no customer-review line in the saved extract, so nobody has reported grip, rust or snapped heads. The listing itself recommends a pilot hole in hardwood, dense timber and near edges. The item-dimensions line of 10 x 10 x 10 mm does not fit a 63 mm screw, so treat the spec table with care. For a shorter sleeper fixing it is cheaper per screw than the 200 mm AJ Timber packs, but you are buying on the listing alone.
Pros
Cons
Best for: Short sleeper and frame joints in softwood where you will pre-drill and accept a listing with no reviews.
Less suitable: Deck boards that need flush heads, hardwood without a pilot, and buyers who want proven review evidence.
Specifications
Common questions
Is a bit included?
The bullet says the pack includes 50 screws and one matching socket driver bit.
Does the listing say to pre-drill?
Yes for hardwood, dense timber, and fixing near edges.
What is the star rating?
The raw file has no customer-review line, so the rating is not available.
Scores run from 0 to 100 and are not a laboratory test. The amazon.co.uk star line is pulled towards a category average of 4.2 with a weight of 100 reviews, then scaled. A 4.9 from 13 reviews therefore does not become 98, and a listing with no review line is scored on listing facts only. Length is checked against the TDCA rule of at least 2.5 times the board thickness. Drive, review-reported defects, listing conflicts and review origin then move the score. The 200 mm hex coach screws lose points because they are frame fixings, not deck-board screws, and they cannot take a badge here. The top pick is the ForgeFix 4.5 x 60 mm box. The best value is the TIMCO Classic 4.5 x 70 mm box. The weights below sum to 100. Eight public sources sit under the page. Prices and stars are the amazon.co.uk extracts saved on 15 and 16 October 2026.
Length and job
25%Board-to-joist is the job this category ranks. Length is at least 2.5 times the board thickness. 50 mm loses points because it only covers boards of about 20 mm. 70 to 75 mm gains a little for 28 to 30 mm boards. The 200 mm hex screws are scored on their reviews, then reduced because they frame posts and sleepers.
Metal and coating
20%Green organic-coated carbon steel suits ordinary inland treated softwood. A4 stainless is the grade for coastal, estuarine or chloride exposure, and for tannin-rich timber such as oak. A salt-spray hour figure is not a number of years outdoors.
Drive
15%Torx or a named bit earns a small credit. A Pozi or unnamed recess that UK reviews say cams out or strips loses points. An unnamed drive on the listing is left as a gap, not guessed.
Defects and conflicts
20%Bent batches, sheared heads, snapped shanks, short boxes and missing bits come off the score when UK review texts report them. Size, material, finish, count or weight fields that contradict the title also come off.
Review evidence
20%The star line is weighted for volume. Texts not labelled United Kingdom, or mixed with US and Canadian buyers, reduce the weight of that line. A listing with no review line gets no star points.
Start with the job. Boards need a deck-board screw. Posts and sleepers need a hex frame screw. Then match length to board thickness, metal to exposure, and drive to the bit you already own. Prices in this set run from about £5.21 to £27.49 on amazon.co.uk.
A decking screw fixes a timber board to a joist. The heavier hex screws on the same amazon.co.uk shelf fix posts and sleepers. They are not board screws. The Timber Decking and Cladding Association says length should be at least 2.5 times the board thickness, with two screws at each crossing, at the quarter points, and about 25 mm from the board ends. Heads should finish flush. Their metal-fixings note gives 50 mm screws for 20 mm boards and 75 mm for 30 mm boards.
The AJ Timber 200 mm hex packs and the Zynthor 6.7 x 63 mm hex screw are for posts, sleepers and frames. A hex washer head does not finish flush in a deck board. Keep them off the board face.
TDCA’s 2.5 times rule makes 50 mm right for a board of about 20 mm, not the 28 to 32 mm boards most garden decks use. The ForgeFix and TIMCO 50 mm boxes are the cheap end of this set for that reason.
Oak and similar tannin-rich species attack the wrong metal. Hollow composite is not a job for these timber screws. Ecodek says not to face-screw hollow boards, and many composite warranties require that brand’s clips or screws.
Length comes first because a cheap box of the wrong length does not hold a board. TDCA wants at least 2.5 times the board thickness. The metal-fixings note gives 50 mm for 20 mm boards and 75 mm for 30 mm boards. Egertons suggests 4.5 x 60 mm or 5 x 65 mm for 32 mm softwood, with at least 25 mm in the joist. In this set that splits the 50 mm ForgeFix and TIMCO boxes from the 60, 70 and 75 mm board screws. Metal follows the site.
Pozi is the ForgeFix drive in this set, and UK reviews describe cam-out, shallow recesses and sheared heads under an impact driver. Torx T25 is on METALLIXITY and the Zynthor 4.8 x 75 mm pack. HOME IT uses TX20. The AJ screws use an 8 mm hex. TIMCO Classic does not name a drive, so check the recess before you buy bits. A named bit in the bullet is not the same as a bit every reviewer received. Pack size comes after length and metal. Boxes of 200 coated screws sit about £5.21 to £8.50.
Three typical situations, each with a recommendation from this comparison.
You are fixing treated softwood boards inland and you want a box of 200 coated 4.5 mm screws, plus a spacing method. The ForgeFix 4.5 x 60 mm box is about £5.84, with 4.7 from 2,831 reviews. It suits boards up to about 32 mm when 25 mm reaches the joist. Pozi heads can strip on a knot, and it is not stainless.
You are replacing old boards or fixing fences, and you care about heads that strip. The TIMCO Classic 4.5 x 70 mm box is about £8.50 for 200, with 4.7 from 197 reviews and no snap or rust pattern in the saved UK texts. The drive type is not named, and a finish field says zinc while the title says green.
You are building a sleeper bed, a retaining wall or a pergola, and you must not confuse a frame screw with a board screw. The AJ Timber 200 mm hex 50-pack is about £27.49, with 4.8 from 580 reviews. UK buyers use it on posts and sleepers. It will not self-drill full depth through oak.
For inland softwood deck boards, the top pick is the ForgeFix 4.5 x 60 mm box of 200 at about £5.84. It has the highest score among deck-board screws here, 4.7 from 2,831 amazon.co.uk reviews, and Egertons puts 60 mm on 32 mm softwood with 25 mm in the joist. Pozi heads can strip under an impact driver, and the head-type field says flat while the title says countersunk. The best value is the TIMCO Classic 4.5 x 70 mm box at about £8.50 for 200. It is the cheapest box of 200 that reaches 70 mm without a bent-batch pattern in the reviews. The ForgeFix 75 mm box is cheaper but has bent screws, a short box and shallow Pozi recesses in UK reviews. The ForgeFix 50 mm box is the cheapest overall and too short for standard boards.
TIMCO Classic 4.5 x 70 mm
Cheapest box of 200 that reaches 70 mm without a bent-batch pattern, at about £8.50.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources on deck fixings, stainless grades, salt spray, permitted development and eye protection. Listing prices and star counts are from the amazon.co.uk extracts kept for this comparison on 15 and 16 October 2026. Prices move.
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. Scores use the 11 listings kept on 15 and 16 October 2026. They are not a laboratory test.
