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Best SPAX screws: the box for the job, and who skips

Updated: 22 October 2026

You want one SPAX box named for a job you can describe, and a clear reason to leave the others. The largest star sample is an exterior stainless screw, and the lowest price is a 30 mm yellow box whose card disagrees with itself. This page names a top pick and a best value inside the five listings on the [SPAX screws comparison](/hub/screws-and-accessories/spax-screws), then says who should open the other three. Scores are an editorial sort of listing facts, not a pull-out test. Peter F., DIY & tools editor, compared these amazon.co.uk cards on 21 October 2026. A qualifying purchase can earn a commission at no extra cost to you.

You want one SPAX box named for a job you can describe, and a clear reason to leave the others.

Our top picks

SPAX SPAX A2 4 x 40 mm

Best overall

SPAX SPAX A2 4 x 40 mm
9.0/10about £20.02
View offer
SPAX SPAX YELLOX 4 x 50 mm

Alternative

SPAX SPAX YELLOX 4 x 50 mm
8.2/10about £18.95
View offer
SPAX SPAX YELLOX 4 x 30 mm

Best value

SPAX SPAX YELLOX 4 x 30 mm
8.6/10about £4.27
View offer
On this page
  1. 1.Top pick when the weather will reach the screw
  2. 2.Best value for a short interior screw
  3. 3.Open the 4 x 50 mm box when you measured that length
  4. 4.The case and the bit kit

Top pick when the weather will reach the screw

The top pick is the SPAX A2 box, ASIN B000VD9T6M, when the screw will get wet. It is 200 stainless 4 x 40 mm screws, partial thread, at about £20.02, 4.8 from 4,208 ratings. The bullet says directly weather-exposed, and SPAX adds low resistance to salt and acids. Skip it for a dry carcass if you only own PZ2. UK reviews report T15 and a missing bit against a T20 title. Coastal salt or a deck is a different range, on SPAX stainless or yellow zinc.

Best value for a short interior screw

The best value is the 4 x 30 mm YELLOX box, ASIN B0057WZEIY: 200 full-thread Z2 screws at about £4.27, 4.7 from 1,209 ratings. UK reviews mention loft chipboard. One review got the wrong length, so measure before you drive a loft full of them. Finish types says powder coated, and an outside-diameter field says 8 mm. Skip it for rain, for 50 mm, or if you only own a star bit. The half-thickness rule is on the SPAX screws buying guide.
SPAX SPAX A2 4 x 40 mm

Testsieger

SPAX SPAX A2 4 x 40 mm
9.0/10about £20.02
View offer

Open the 4 x 50 mm box when you measured that length

The 4 x 50 mm YELLOX box, ASIN B0057XFTYM, is the longer interior screw at about £18.95, full thread, Z2, 4.7 from 1,782 ratings. UK reviews mention curtain poles, blinds, shelf brackets in ply, and a chest of drawers. Open it when you have measured about 50 mm. Leave it for a thin loft board, and leave it in the rain. Origin says China and a UK review says German made. The thread field says #0-80. One review mentions 35 mm.

The case and the bit kit

The 245-piece case, ASIN B00AJGJOTI, at about £20.80 lists 3.5 x 16 mm through 5 x 60 mm, 4.6 from 197 ratings. The colour field says gray. Open it when you do not know the next length and the case stays indoors. The Pozi kit, ASIN B00LXESS1U, at about £21.49 is the only box in this set whose bullets include SPAX bits. The line is 4.7 from 30 ratings. The title says 199, a bullet says 195, and the unit count says 198. Open it only if you wanted bits in the lid and you will count the compartments.

Common questions

Which box is the top pick, and for whom?
The top pick is B000VD9T6M, stainless A2, 4 x 40 mm, at about £20.02, when rain will reach a screw of that length. It is 4.8 from 4,208 ratings. It is the wrong pick for a dry carcass if you only own PZ2, and it is not an A4 coastal screw or a decking screw. You still buy the bit separately.
Which box is the best value, and what is wrong with the card?
The best value is B0057WZEIY, 200 of the 4 x 30 mm YELLOX screws at about £4.27, 4.7 from 1,209, for a short interior job. The card also says powder coated, prints an 8 mm outside diameter, and shares its rank with the 50 mm ASIN. One UK review got the wrong size. Measure on arrival.
Should you buy the 4 x 50 mm box instead of the 4 x 30 mm box?
Buy the 50 mm box when 30 mm will not give the bite you measured, and you are staying indoors with a PZ2 bit. It is about £18.95 against about £4.27, with 4.7 from 1,782 ratings. Do not buy it only because the sample is larger. The origin field says China, the thread field says #0-80, and a review mentions 35 mm.
Is the 245-piece case the one to keep in the house?
Keep it if your jobs jump between the sizes on the card, from 3.5 x 16 mm to 5 x 60 mm, and the screws stay indoors. It is about £20.80 and 4.6 from 197 ratings. It is a poor keep if you will only use 4 x 30 mm. The colour field says gray against yellow-zinc bullets.
Is the bit kit worth about £21.49 when only 30 people have rated it?
Not as the default. Thirty ratings and three UK texts are a thin sample next to 1,209 or 4,208. The bullets do include bits, which the single-length boxes do not, and one review calls the holder generic. The piece count is 199, 195 and 198. Buy it only if bits in the case are the reason you came.
What should you check the day the box arrives?
Check length against the title, because a 30 mm order has arrived short in a UK review and a 50 mm review mentions 35 mm. Check the recess, because the A2 title says T20 and reviews report T15 and a cross head. Check that a yellow box is yellow. Count the bit kit if you bought it, then drive one screw in scrap.

Related pages

How to use SPAX screws

SPAX screws

SPAX screws buying guide: finish, thread, then bit

SPAX screws for chipboard: 30 mm, 50 mm, or SPAX-M

SPAX stainless or yellow zinc: which screw outside

Sources

Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are the amazon.co.uk lines in the display file. There is no laboratory test, no salt-spray test, and no pull-out value. A yellow assortment is not treated as ETA-12/0114.

  1. SPAX universal screw, WIROX page (retrieved 22 October 2026)
  2. SPAX technical lexicon (retrieved 22 October 2026)
  3. SPAX stainless A2 universal (retrieved 22 October 2026)
  4. SPAX UKCA (retrieved 22 October 2026)
  5. ETA-12/0114 (15 October 2024) (retrieved 22 October 2026)
  6. GOV.UK construction products (retrieved 22 October 2026)
  7. HSE wood dust (retrieved 22 October 2026)
  8. Screwfix screws buying guide (retrieved 22 October 2026)