Special Offers
-
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
-
M12 X 120 Cup Square Bolt DIN 603 A4 Stainless Steel
In stockThis M12 x 120mm 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 £21.72RRP From £21.72 -
M8 Cast Eye Bolt A4 Stainless Steel
In stockM8 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 £4.52RRP From £4.52 -
M8 Cast Eye Bolt A2 Stainless Steel
In stockM8 eye bolt in A2 stainless steel. Cast loop head suits general-purpose anchoring, tie-downs, guide wires, and light hand-tension applications in workshops and plant rooms. A2 (304 grade) gives good corrosion resistance for indoor and non-coastal...RRP From £4.10RRP From £4.10 -
M6 Cast Eye Bolt A2 Stainless Steel
In stockM6 eye bolt in A2 stainless steel. Cast loop head suits general-purpose anchoring, tie-downs, guide wires, and light hand-tension applications in workshops and plant rooms. A2 (304 grade) gives good corrosion resistance for indoor and non-coastal...RRP From £2.71RRP From £2.71 -
M8 X 40 Cup Square Bolt DIN 603 A2 Stainless Steel
In stockM8 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 £2.52RRP From £2.52 -
M6 X 75 Cup Square Bolt DIN 603 A2 Stainless Steel
In stockM6 x 75mm 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 £4.97RRP From £4.97 -
M10 X 1 Plug Pitch DIN 908 A4 Stainless Steel
In stockThis M10 x 1mm plug Pitch is manufactured to DIN 908 in A4 stainless steel (316 grade).Typical applications Boat fittings, rigging, and deck hardware Dock, pontoon, and coastal installations Exposed structures in salt-laden or chloride-rich air...RRP From £18.10RRP From £18.10 -
M30 X 1.5 Threaded Plugs DIN 908 A2 Stainless Steel
Out of stockThis M30 x 1.5mm threaded plug is manufactured to DIN 908 in A2 stainless steel (304 grade). DIN 908 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or...RRP From £30.23RRP From £30.23 -
M20 X 1.5 Threaded Plugs DIN 908 A4 Stainless Steel
In stockThis M20 x 1.5mm threaded plug is manufactured to DIN 908 in A4 stainless steel (316 grade). DIN 908 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or...RRP From £25.00RRP From £25.00 -
M18 X 1.5 Threaded Plugs DIN 908 A2 Stainless Steel
In stockThis M18 x 1.5mm threaded plug is manufactured to DIN 908 in A2 stainless steel (304 grade). DIN 908 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or...RRP From £23.63RRP From £23.63 -
M16 X 1.5 Threaded Plugs DIN 908 A4 Stainless Steel
Out of stockThis M16 x 1.5mm threaded plug is manufactured to DIN 908 in A4 stainless steel (316 grade). DIN 908 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or...RRP From £33.42RRP From £33.42 -
M12 X 1.5 Threaded Plugs DIN 910 A4 Stainless Steel
In stockThis M12 x 1.5mm threaded plug is manufactured to DIN 910 in A4 stainless steel (316 grade). DIN 910 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or...RRP From £27.94RRP From £27.94 -
M12 X 1.5 Threaded Plugs DIN 908 A4 Stainless Steel
In stockThis M12 x 1.5mm threaded plug is manufactured to DIN 908 in A4 stainless steel (316 grade). DIN 908 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or...RRP From £22.38RRP From £22.38 -
3/8" Threaded Plugs DIN 908 A4 Stainless Steel
In stockThis 3/8" threaded plug is manufactured to DIN 908 in A4 stainless steel (316 grade). DIN 908 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or drain. Screwed...RRP From £27.69RRP From £27.69 -
1/8" Threaded Plugs DIN 908 A4 Stainless Steel
In stockThis 1/8" threaded plug is manufactured to DIN 908 in A4 stainless steel (316 grade). DIN 908 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or drain. Screwed...RRP From £17.65RRP From £17.65 -
1/4" Threaded Plugs DIN 910 A4 Stainless Steel
In stockThis 1/4" threaded plug is manufactured to DIN 910 in A4 stainless steel (316 grade). DIN 910 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or drain. Screwed...RRP From £23.46RRP From £23.46 -
1/4" Threaded Plugs DIN 908 A4 Stainless Steel
In stockThis 1/4" threaded plug is manufactured to DIN 908 in A4 stainless steel (316 grade). DIN 908 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or drain. Screwed...RRP From £21.79RRP From £21.79 -
1/2" Threaded Plugs DIN 910 A4-70 A4 Stainless Steel
In stockThis 1/2" threaded plug is manufactured to DIN 910 in A4 stainless steel (316 grade). DIN 910 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or drain. Screwed...RRP From £21.59RRP From £21.59 -
1/2" Threaded Plugs DIN 910 A4 Stainless Steel
In stockThis 1/2" threaded plug is manufactured to DIN 910 in A4 stainless steel (316 grade). DIN 910 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or drain. Screwed...RRP From £20.97RRP From £20.97 -
1/2" Threaded Plugs DIN 908 A4 Stainless Steel
Out of stockThis 1/2" threaded plug is manufactured to DIN 908 in A4 stainless steel (316 grade). DIN 908 specifies a solid externally threaded body, often with a sealing face, for closing a tapped port or drain. Screwed...RRP From £4.02RRP From £4.02 -
1" Threaded Plug DIN 908 A4 Stainless Steel
In stockThis 1" threaded Plug is manufactured to DIN 908 in A4 stainless steel (316 grade).Typical applications Boat fittings, rigging, and deck hardware Dock, pontoon, and coastal installations Exposed structures in salt-laden or chloride-rich air Any fixing...RRP From £24.88RRP From £24.88 -
M8 X 50 Weld Stud Type PT ISO 13918 Stainless Steel
In stockThis M8 x 50mm weld stud is manufactured to ISO 13918 in stainless steel. ISO 13918 specifies a threaded stud designed to be fixed by stud welding rather than through a drilled hole, giving a threaded...RRP From £14.25RRP From £14.25 -
M8 X 45 Weld Stud Type PT ISO 13918 Stainless Steel
In stockThis M8 x 45mm weld stud is manufactured to ISO 13918 in stainless steel. ISO 13918 specifies a threaded stud designed to be fixed by stud welding rather than through a drilled hole, giving a threaded...RRP From £12.72RRP From £12.72 -
M8 X 35 Weld Stud Type PT ISO 13918 Stainless Steel
In stockThis M8 x 35mm weld stud is manufactured to ISO 13918 in stainless steel. ISO 13918 specifies a threaded stud designed to be fixed by stud welding rather than through a drilled hole, giving a threaded...RRP From £20.62RRP From £20.62 -
M8 X 30 Weld Stud Type PT ISO 13918 Stainless Steel
Out of stockThis M8 x 30mm weld stud is manufactured to ISO 13918 in stainless steel. ISO 13918 specifies a threaded stud designed to be fixed by stud welding rather than through a drilled hole, giving a threaded...RRP From £24.11RRP From £24.11
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.