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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M6 X 40 Cup Square Bolt DIN 603 A2 Stainless Steel
In stockM6 x 40mm coach bolt in A2 stainless steel to DIN 603. The domed round head and square neck lock against the timber face, preventing rotation during tightening - ideal for outdoor timber structures, fencing, gates,...RRP From £3.62RRP From £3.62 -
M10 X 120 Hexagon Head Bolt DIN 931 A4-80 A4 Stainless Steel
In stockThis M10 x 120mm 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 £18.05RRP From £18.05 -
M5 X 60 Cup Square Bolt DIN 603 A2 Stainless Steel
In stockThis M5 x 60mm coach bolt (cup square head bolt) is manufactured to DIN 603 in A2 stainless steel (304 grade). DIN 603 specifies a domed round head with a small square neck directly below the...RRP From £5.05RRP From £5.05 -
M12 X 300 Cup Square Bolt DIN 603 A4 Stainless Steel
In stockThis M12 x 300mm coach bolt (cup square head bolt) is manufactured to DIN 603 in A4 stainless steel (316 grade). DIN 603 specifies a domed round head with a small square neck directly below the...RRP From £23.14RRP From £23.14 -
M10 Cast Eye Bolt A4 Stainless Steel
In stockM10 eye bolt in A4 stainless steel. Cast loop head suits general-purpose anchoring, tie-downs, guide wires, and light hand-tension applications in workshops and plant rooms. A4 (316) marine grade gives outstanding resistance to saltwater and chloride...RRP From £6.48RRP From £6.48 -
M6 Cast Eye Bolt A4 Stainless Steel
In stockM6 eye bolt in A4 stainless steel. Cast loop head suits general-purpose anchoring, tie-downs, guide wires, and light hand-tension applications in workshops and plant rooms. A4 (316) marine grade gives outstanding resistance to saltwater and chloride...RRP From £2.70RRP From £2.70 -
M10 X 130 Cup Square Bolt DIN 603 A2 Stainless Steel
In stockM10 x 130mm coach bolt in A2 stainless steel to DIN 603. The domed round head and square neck lock against the timber face, preventing rotation during tightening - ideal for outdoor timber structures, fencing, gates,...RRP From £9.54RRP From £9.54 -
M8 X 60 Weld Stud Type PT ISO 13918 A2 Stainless Steel
In stockThis M8 x 60mm weld stud is manufactured to ISO 13918 in A2 stainless steel (304 grade). ISO 13918 specifies a threaded stud designed to be fixed by stud welding rather than through a drilled hole,...RRP From £9.09RRP From £9.09 -
M8 X 40 Weld Stud Type PT ISO 13918 A2 Stainless Steel
In stockThis M8 x 40mm weld stud is manufactured to ISO 13918 in A2 stainless steel (304 grade). ISO 13918 specifies a threaded stud designed to be fixed by stud welding rather than through a drilled hole,...RRP From £12.88RRP From £12.88 -
8 X 60 Eyebolt Wood Thread A4 Stainless Steel
Out of stockThis 8 x 60mm wood thread eye bolt is manufactured in A4 stainless steel (316 grade). The coarse thread cuts its own path into timber and the closed eye takes the line, giving a fixing that...RRP From £29.93RRP From £29.93 -
M8 X 25 Hammer Head Bolt A2 Stainless Steel
In stockThis M8 x 25mm hammer Head Bolt is manufactured in A2 stainless steel (304 grade).Typical applications Workshop, maintenance, and repair work Machinery assembly and equipment mounting General fabrication and engineering Brackets, frames, and shelving systems Available...RRP From £4.50RRP From £4.50 -
M8 X 20 Hammer Head Bolt A2 Stainless Steel
In stockThis M8 x 20mm hammer Head Bolt is manufactured in A2 stainless steel (304 grade).Typical applications Workshop, maintenance, and repair work Machinery assembly and equipment mounting General fabrication and engineering Brackets, frames, and shelving systems Available...RRP From £6.75RRP From £6.75 -
M8 X 40 Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel
In stockThis M8 x 40mm 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 £6.37RRP From £6.37 -
M6 X 150 Hexagon Head Bolt DIN 931 A4 Stainless Steel
In stockThis M6 x 150mm 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 £12.68RRP From £12.68 -
M16 X 120 Hexagon Head Bolt DIN 931 A4-80 A4 Stainless Steel
In stockThis M16 x 120mm 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 £21.60RRP From £21.60 -
M14 X 200 Hexagon Head Bolt DIN 931 A4 Stainless Steel
In stockThis M14 x 200mm 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 £35.89RRP From £35.89 -
M12 X 110 Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel
In stockThis M12 x 110mm 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 £13.97RRP From £13.97 -
M10 X 150 Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel
In stockThis M10 x 150mm 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 £12.12RRP From £12.12 -
3/8" UNC X 2.5" Hex Head Bolt A4 Stainless Steel
In stockThis 3/8" UNC x 2.5" part threaded hex bolt is manufactured in A4 stainless steel (316 grade). The unthreaded shank sits in the bearing hole rather than the thread, locating the joint accurately and presenting a...RRP From £28.29RRP From £28.29 -
1/2" UNC X 2.1/2" Hex Bolt A4 Stainless Steel
In stockThis 1/2" UNC x 2.1/2" part threaded hex bolt is manufactured in A4 stainless steel (316 grade). The unthreaded shank sits in the bearing hole rather than the thread, locating the joint accurately and presenting a...RRP From £12.41RRP From £12.41 -
M12 X 100 Eye Bolt DIN 444 A2 Stainless Steel
In stockThis M12 x 100mm eye bolt is manufactured to DIN 444 in A2 stainless steel (304 grade). DIN 444 specifies a bolt with a formed circular eye in place of a conventional head, providing a fixed...RRP From £9.03RRP From £9.03 -
M8 X 65 Cup Square Bolt DIN 603 A2 Stainless Steel
In stockThis M8 x 65mm coach bolt (cup square head bolt) is manufactured to DIN 603 in A2 stainless steel (304 grade). DIN 603 specifies a domed round head with a small square neck directly below the...RRP From £5.00RRP From £5.00 -
M6 X 80 Cup Square Bolt DIN 603 A2 Stainless Steel
In stockThis M6 x 80mm coach bolt (cup square head bolt) is manufactured to DIN 603 in A2 stainless steel (304 grade). DIN 603 specifies a domed round head with a small square neck directly below the...RRP From £4.22RRP From £4.22 -
M5 X 80 Cup Square Bolt DIN 603 A2 Stainless Steel
In stockThis M5 x 80mm coach bolt (cup square head bolt) is manufactured to DIN 603 in A2 stainless steel (304 grade). DIN 603 specifies a domed round head with a small square neck directly below the...RRP From £3.69RRP From £3.69 -
M5 X 45 Cup Square Bolt DIN 603 A4 Stainless Steel
In stockThis M5 x 45mm coach bolt (cup square head bolt) is manufactured to DIN 603 in A4 stainless steel (316 grade). DIN 603 specifies a domed round head with a small square neck directly below the...RRP From £5.44RRP From £5.44
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.