Special Offers
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6.3 X 25 Hex Head Self Drilling Screw DIN 7504-K A2 Stainless Steel
In stockRRP From £11.21 -
M8 Flat Washer, Form A DIN 125-A A2 Stainless Steel
In stockRRP From £2.69 -
M8 Nylon Insert Nut DIN 985 A2 Stainless Steel
In stockRRP From £3.23 -
M10 Hexagon Full Nut DIN 934 A2 Stainless Steel
In stockRRP From £3.99
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M20 X 90 Hexagon Head Bolt DIN 931 A4-80 A4 Stainless Steel
In stockThis M20 x 90mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £25.28RRP From £25.28 -
M20 X 80 Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel
In stockThis M20 x 80mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £19.82RRP From £19.82 -
M20 X 75 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 75mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £7.76RRP From £7.76 -
M20 X 95 Hexagon Head Bolt DIN 931 A4-80 A4 Stainless Steel
In stockThis M20 x 95mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £33.80RRP From £33.80 -
M20 X 70 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 70mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £7.10RRP From £7.10 -
M20 X 60 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 60mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £12.72RRP From £12.72 -
M20 X 65 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 65mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £13.25RRP From £13.25 -
M20 X 60 Hexagon Head Bolt DIN 931 A4-80 A4 Stainless Steel
In stockThis M20 x 60mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £13.76RRP From £13.76 -
M20 X 60 Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel
In stockThis M20 x 60mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £17.25RRP From £17.25 -
M20 X 435 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 435mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £2.82RRP From £2.82 -
M20 X 380 Hexagon Head Bolt DIN 931 A4 Stainless Steel
Out of stockThis M20 x 380mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £128.62RRP From £128.62 -
M20 X 360 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 360mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £10.93RRP From £10.93 -
M20 X 340 Hexagon Head Bolt DIN 931 A4 Stainless Steel
In stockThis M20 x 340mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £21.13RRP From £21.13 -
M20 X 320 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 320mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £9.42RRP From £9.42 -
M20 X 360 Hexagon Head Bolt DIN 931 A4 Stainless Steel
Out of stockThis M20 x 360mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £19.87RRP From £19.87 -
M20 X 300 Hexagon Head Bolt DIN 931 A4 Stainless Steel
In stockThis M20 x 300mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £47.66RRP From £47.66 -
M20 X 300 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 300mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £15.44RRP From £15.44 -
M20 X 280 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 280mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £19.45RRP From £19.45 -
M20 X 270 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 270mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £20.46RRP From £20.46 -
M20 X 260 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 260mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £23.92RRP From £23.92 -
M20 X 260 Hexagon Head Bolt DIN 931 A4 Stainless Steel
In stockThis M20 x 260mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £41.86RRP From £41.86 -
M20 X 250 Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel
In stockThis M20 x 250mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £40.91RRP From £40.91 -
M20 X 280 Hexagon Head Bolt DIN 931 A4 Stainless Steel
In stockThis M20 x 280mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £48.68RRP From £48.68 -
M20 X 250 Hexagon Head Bolt DIN 931 A2 Stainless Steel
In stockThis M20 x 250mm part threaded hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £23.60RRP From £23.60 -
M20 X 250 Hexagon Head Bolt DIN 931 A4-80 A4 Stainless Steel
In stockThis M20 x 250mm part threaded hex bolt is manufactured to DIN 931 in A4 stainless steel (316 grade). DIN 931 specifies a hex head bolt with a plain shank beneath the head and thread over...RRP From £20.48RRP From £20.48
Stainless steel bolts in A2 (304) and A4 (316): part threaded hex head bolts from M5 to M48, cup square (carriage) bolts, eye bolts, U-bolts, hanger bolts and hammer head bolts, plus throughbolts and drop-in anchors for concrete and weld studs.
Hex head bolts are made to ISO 4014 and DIN 931, and many A4 sizes come in both property class A4-70 and the stronger A4-80. Imperial hex bolts come in UNC, UNF and BSW threads. Cup square bolts are made to DIN 603 in A2 and A4 from M5 to M16. Fully threaded hex set screws have their own Hexagon Set Screws collection.
Choose A2 for indoor and inland outdoor use; choose A4 near the coast or wherever salt is present.
Frequently asked questions
What bolts does Simfix stock in A2 and A4 stainless steel?
Part threaded hex head bolts (ISO 4014 and DIN 931) from M5 to M48, cup square bolts (DIN 603) from M5 to M16, eye bolts, U-bolts, hanger bolts, hammer head bolts, throughbolts, drop-in anchors and weld studs. Hex head bolts, cup square bolts and eye bolts come in both A2 (304) and A4 (316); the throughbolts and drop-in anchors are A4 only.
What is the difference between a hex head bolt and a hex set screw?
A hex head bolt (ISO 4014 or DIN 931) has a plain, unthreaded section of shank under the head and threads only along the lower part. A hex set screw (ISO 4017 or DIN 933) is threaded along its full length. Use a part threaded bolt where the plain shank sits in the shear plane; use a set screw for blind holes or thin material.
What is a cup square bolt used for?
A cup square bolt, also called a coach bolt or carriage bolt, has a domed head and a square shoulder under it that bites into the wood and stops the bolt spinning while you tighten the nut. Simfix stocks them to DIN 603 in A2 (304) and A4 (316), M5 to M16, for decking, fencing, gates and other timber joints.
Are Simfix eye bolts rated for lifting?
Only use an eye bolt for lifting when the specific product has a documented working load limit and instructions for the intended lift. A shape, standard number or CE label alone does not establish the rating for your application. Check load direction, installation and the manufacturer’s instructions before use.
Should I choose A2 or A4 stainless steel bolts?
Choose A2 (304) for indoor use and general outdoor and inland work. Choose A4 (316) near the sea, around swimming pools or anywhere exposed to salt or chlorides. The difference is molybdenum: A4 contains 2% to 3% molybdenum, which resists the chloride pitting that A2 does not.
Sizes, grades and pack quantities vary by product type. Check the individual product listing for the exact specification and current availability.