Special Offers
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Hex Head Self Driller DIN 7504-K A2 Stainless Steel (6.3 X 25)
1000+ in stockRRP From £8.20 -
Cup Square Bolt DIN 603 A2 Stainless Steel (M6 X 40)
1000+ in stockRRP From £5.70 -
Nylon Insert Nut DIN 985 A2 Stainless Steel (M8)
1000+ in stockRRP From £2.88 -
Socket Set Flat Point Screw ISO 4026 A2 Stainless Steel (M6 X 8)
1000+ in stockRRP From £3.00
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Hexagon Socket Button Screw ISO 7380-1 A4 Stainless Steel (M6 X 16)
1000+ in stockM6 x 16mm button head socket screw in A4 marine grade stainless steel to ISO 7380-1. The wide, low-profile dome head distributes load across a larger bearing surface than a cap screw, ideal for furniture, signage,...RRP From £4.03RRP From £4.03 -
Hexagon Socket Button Screw ISO 7380-1 A4 Stainless Steel (M5 X 20)
1000+ in stockM5 x 20mm button head socket screw in A4 marine grade stainless steel to ISO 7380-1. The wide, low-profile dome head distributes load across a larger bearing surface than a cap screw, ideal for furniture, signage,...RRP From £4.13RRP From £4.13 -
Hexagon Socket Button Screw ISO 7380-1 A4 Stainless Steel (M5 X 16)
1000+ in stockM5 x 16mm button head socket screw in A4 marine grade stainless steel to ISO 7380-1. The wide, low-profile dome head distributes load across a larger bearing surface than a cap screw, ideal for furniture, signage,...RRP From £4.03RRP From £4.03 -
Hexagon Socket Button Screw ISO 7380-1 A4 Stainless Steel (M4 X 12)
1000+ in stockM4 x 12mm button head socket screw in A4 marine grade stainless steel to ISO 7380-1. The wide, low-profile dome head distributes load across a larger bearing surface than a cap screw, ideal for furniture, signage,...RRP From £3.68RRP From £3.68 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M8 X 40)
1000+ in stockM8 x 40mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £6.77RRP From £6.77 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M8 X 30)
1000+ in stockM8 x 30mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £6.43RRP From £6.43 -
Hexagon Socket Cap Screw ISO 4762 A4-80 A4 Stainless Steel (M8 X 20)
1000+ in stockM8 x 20mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £6.08RRP From £6.08 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M6 X 30)
1000+ in stockM6 x 30mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....Sale price From £4.45RRP £5.23Sale price From £4.45RRP £5.23 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M6 X 25)
1000+ in stockM6 x 25mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £5.05RRP From £5.05 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M6 X 20)
1000+ in stockM6 x 20mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £4.88RRP From £4.88 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M5 X 25)
1000+ in stockM5 x 25mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £5.05RRP From £5.05 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M5 X 20)
1000+ in stockM5 x 20mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £4.88RRP From £4.88 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M5 X 16)
1000+ in stockM5 x 16mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £4.75RRP From £4.75 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M4 X 20)
1000+ in stockM4 x 20mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £4.28RRP From £4.28 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M4 X 16)
1000+ in stockM4 x 16mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £4.15RRP From £4.15 -
Hexagon Socket Cap Screw ISO 4762 A4 Stainless Steel (M4 X 12)
1000+ in stockM4 x 12mm socket cap screw in A4 marine grade stainless steel to ISO 4762. Driven with a hex key, the cylindrical head suits machinery, jig frames, and precision assemblies where a spanner has no clearance....RRP From £4.01RRP From £4.01 -
Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel (M12 X 100)
1000+ in stockM12 x 100mm part-threaded hex bolt in A4 stainless steel, manufactured to DIN 931 at property class A4-70. The plain shank reduces stress concentration at the thread run-out, suited to shear-loaded joints and structural through-bolting. A4...RRP From £19.88RRP From £19.88 -
Hexagon Head Bolt DIN 931 A4-80 A4 Stainless Steel (M12 X 80)
1000+ in stockM12 x 80mm part-threaded hex bolt in A4 stainless steel, manufactured to DIN 931 at property class A4-80. The plain shank reduces stress concentration at the thread run-out, suited to shear-loaded joints and structural through-bolting. A4...RRP From £19.03RRP From £19.03 -
Hexagon Head Bolt DIN 931 A4-80 A4 Stainless Steel (M10 X 80)
1000+ in stockM10 x 80mm part-threaded hex bolt in A4 stainless steel, manufactured to DIN 931 at property class A4-80. The plain shank reduces stress concentration at the thread run-out, suited to shear-loaded joints and structural through-bolting. A4...RRP From £14.23RRP From £14.23 -
Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel (M10 X 60)
1000+ in stockM10 x 60mm part-threaded hex bolt in A4 stainless steel, manufactured to DIN 931 at property class A4-70. The plain shank reduces stress concentration at the thread run-out, suited to shear-loaded joints and structural through-bolting. A4...RRP From £13.37RRP From £13.37 -
Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel (M8 X 80)
1000+ in stockM8 x 80mm part-threaded hex bolt in A4 stainless steel, manufactured to DIN 931 at property class A4-70. The plain shank reduces stress concentration at the thread run-out, suited to shear-loaded joints and structural through-bolting. A4...RRP From £10.63RRP From £10.63 -
Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel (M8 X 60)
1000+ in stockM8 x 60mm part-threaded hex bolt in A4 stainless steel, manufactured to DIN 931 at property class A4-70. The plain shank reduces stress concentration at the thread run-out, suited to shear-loaded joints and structural through-bolting. A4...RRP From £9.77RRP From £9.77 -
Hexagon Head Set Screw DIN 933 A4-70 A4 Stainless Steel (M12 X 60)
1000+ in stockM12 x 60mm fully threaded hex bolt in A4 marine grade stainless steel, manufactured to DIN 933 at property class A4-70. The full-length thread makes it versatile for through-bolting and general M12 fastening across light engineering,...RRP From £16.45RRP From £16.45 -
Hexagon Head Set Screw DIN 933 A4-80 A4 Stainless Steel (M12 X 40)
1000+ in stockM12 x 40mm fully threaded hex bolt in A4 marine grade stainless steel, manufactured to DIN 933 at property class A4-80. The full-length thread makes it versatile for through-bolting and general M12 fastening across light engineering,...RRP From £15.77RRP From £15.77 -
Hexagon Head Set Screw DIN 933 A4-80 A4 Stainless Steel (M10 X 60)
1000+ in stockM10 x 60mm fully threaded hex bolt in A4 marine grade stainless steel, manufactured to DIN 933 at property class A4-80. The full-length thread makes it versatile for through-bolting and general M10 fastening across light engineering,...RRP From £12.25RRP From £12.25
A4 (316) is marine grade stainless steel. The molybdenum in the alloy resists the chloride pitting that attacks ordinary stainless in salt air, so A4 is the grade to specify anywhere salt, chlorine or constant damp is part of the environment.
This collection brings together every A4 (316) fastener Simfix stocks, covering hex bolts, carriage bolts, socket caps, machine screws, wood screws, self-tapping screws, nuts and washers, all manufactured to DIN, ISO or BS standards.
When to choose A4 (316)
- Boats, jetties, pontoons and rigging hardware
- Coastal buildings, balconies and anything within reach of salt spray
- Swimming pools and changing rooms, where chlorine is present
- Bathrooms, wet rooms and kitchens that stay humid
When A2 (304) is enough
For indoor work, workshops, and garden structures away from the coast, A2 (304) stainless steel gives full corrosion resistance at a lower cost. A4 is worth the uplift where chlorides are present, not as a blanket upgrade.
Every size is available in DIY and Trade pack quantities.