Special Offers
-
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
-
Flat Washer, Form C BS4320-C A4 Stainless Steel (M10)
1000+ in stockM10 flat washer (Form C, large OD) in A4 stainless steel (316 marine grade) to BS4320-C. The large outer diameter spreads load over a wider area than a standard Form A washer - useful for oversized...RRP From £2.76RRP From £2.76 -
Dome Nut DIN 1587 A4 Stainless Steel (M6)
1000+ in stockM6 dome nut in A4 stainless steel to DIN 1587. The domed cap covers the exposed end of a bolt thread for a safe, finished appearance - used on outdoor furniture, signage, architectural fixings, and play...RRP From £4.20RRP From £4.20 -
A4 Cast Eye Bolt Stainless Steel (M8)
1000+ 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 £8.39RRP From £8.39 -
A4 Cast Eye Bolt Stainless Steel (M6)
1000+ 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 £7.19RRP From £7.19 -
Poz Pan Tapping Screw DIN 7981-C A4 Stainless Steel (4.2 X 16)
1000+ in stock4.2mm x 16mm Pozidriv pan head self-tapping screw in A4 marine grade stainless steel to DIN 7981-C. Thread-forming point cuts its own thread into suitable plastics, UPVC, aluminium and other compatible thin-gauge substrates without pre-tapping. A4...RRP From £9.40RRP From £9.40 -
Rect Sect Spring Washer DIN 127-B A4 Stainless Steel (M10)
1000+ in stockM10 spring washer in A4 stainless steel to DIN 127-B. Exerts continuous axial spring load on the nut face once tightened, resisting loosening under vibration and dynamic loading without thread locking compound. A4 (316) marine grade...RRP From £2.70RRP From £2.70 -
Flat Washer, Form A DIN 125-A A4 Stainless Steel (M6)
1000+ in stockM6 flat washer in A4 stainless steel (316 marine grade) to DIN 125-A. Distributes clamping load under bolt heads and nuts, protecting timber, aluminium, and coated substrates from crushing or marking. A4 (316) resists saltwater and...RRP From £2.27RRP From £2.27 -
Dome Nut DIN 1587 A4 Stainless Steel (M8)
1000+ in stockM8 dome nut in A4 stainless steel to DIN 1587. The domed cap covers the exposed end of a bolt thread for a safe, finished appearance - used on outdoor furniture, signage, architectural fixings, and play...RRP From £4.80RRP From £4.80 -
Dome Nut DIN 1587 A4 Stainless Steel (M5)
1000+ in stockM5 dome nut in A4 stainless steel to DIN 1587. The domed cap covers the exposed end of a bolt thread for a safe, finished appearance - used on outdoor furniture, signage, architectural fixings, and play...RRP From £3.60RRP From £3.60 -
Hexagon Full Nut DIN 934 A4-80 A4 Stainless Steel (M10)
1000+ in stockM10 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M10 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies,...RRP From £9.60RRP From £9.60 -
Hexagon Full Nut DIN 934 A4-80 A4 Stainless Steel (M8)
1000+ in stockM8 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M8 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies,...RRP From £6.00RRP From £6.00 -
Hexagon Full Nut DIN 934 A4-80 A4 Stainless Steel (M6)
1000+ in stockM6 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M6 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies,...RRP From £4.80RRP From £4.80 -
Hexagon Full Nut DIN 934 A4-80 A4 Stainless Steel (M5)
1000+ in stockM5 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M5 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies,...RRP From £4.32RRP From £4.32 -
Hexagon Full Nut DIN 934 A4 Stainless Steel (M4)
1000+ in stockM4 hex nut in A4 marine grade stainless steel to DIN 934. Full-height hexagon form, compatible with all M4 bolts, machine screws, and threaded rod to metric coarse pitch. Suitable for general indoor and outdoor assemblies,...RRP From £3.60RRP From £3.60 -
Hex Socket Countersunk Screw ISO 10642 A4 Stainless Steel (M5 X 16)
1000+ in stockM5 x 16mm countersunk socket screw in A4 marine grade stainless steel to ISO 10642. Hex key driven with a flush countersunk head - suited to machinery panels, access covers, and cabinetwork where a clean surface...RRP From £3.84RRP From £3.84 -
Hexagon Socket Button Screw ISO 7380-1 A4 Stainless Steel (M4 X 16)
1000+ in stockM4 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 £3.79RRP From £3.79 -
Hexagon Head Set Screw DIN 933 A4-70 A4 Stainless Steel (M8 X 20)
1000+ in stockM8 x 20mm 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 M8 fastening across light engineering,...RRP From £6.68RRP From £6.68 -
Hexagon Head Set Screw DIN 933 A4-70 A4 Stainless Steel (M6 X 40)
1000+ in stockM6 x 40mm 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 M6 fastening across light engineering,...RRP From £5.92RRP From £5.92 -
Hexagon Head Set Screw DIN 933 A4-70 A4 Stainless Steel (M10 X 100)
1000+ in stockM10 x 100mm fully threaded hex bolt in A4 marine stainless steel, manufactured to DIN 933 at property class A4-70. The full-length thread makes it versatile for through-bolting and general M10 fastening across light engineering, joinery,...RRP From £13.63RRP From £13.63 -
A4 Cast Eye Bolt Stainless Steel (M10)
1000+ 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 £11.99RRP From £11.99 -
Poz Pan Tapping Screw DIN 7981-C A4 Stainless Steel (4.8 X 38)
1000+ in stock4.8mm x 38mm Pozidriv pan head self-tapping screw in A4 marine grade stainless steel to DIN 7981-C. Thread-forming point cuts its own thread into suitable plastics, UPVC, aluminium and other compatible thin-gauge substrates without pre-tapping. A4...RRP From £12.95RRP From £12.95 -
Poz Pan Tapping Screw DIN 7981-C A4 Stainless Steel (4.8 X 25)
1000+ in stock4.8mm x 25mm Pozidriv pan head self-tapping screw in A4 marine grade stainless steel to DIN 7981-C. Thread-forming point cuts its own thread into suitable plastics, UPVC, aluminium and other compatible thin-gauge substrates without pre-tapping. A4...RRP From £12.62RRP From £12.62 -
Poz Pan Tapping Screw DIN 7981-C A4 Stainless Steel (4.8 X 19)
1000+ in stock4.8mm x 19mm Pozidriv pan head self-tapping screw in A4 marine grade stainless steel to DIN 7981-C. Thread-forming point cuts its own thread into suitable plastics, UPVC, aluminium and other compatible thin-gauge substrates without pre-tapping. A4...RRP From £12.48RRP From £12.48 -
Poz Pan Tapping Screw DIN 7981-C A4 Stainless Steel (4.2 X 32)
1000+ in stock4.2mm x 32mm Pozidriv pan head self-tapping screw in A4 marine grade stainless steel to DIN 7981-C. Thread-forming point cuts its own thread into suitable plastics, UPVC, aluminium and other compatible thin-gauge substrates without pre-tapping. A4...RRP From £9.80RRP From £9.80 -
Poz Pan Tapping Screw DIN 7981-C A4 Stainless Steel (4.2 X 25)
1000+ in stock4.2mm x 25mm Pozidriv pan head self-tapping screw in A4 marine grade stainless steel to DIN 7981-C. Thread-forming point cuts its own thread into suitable plastics, UPVC, aluminium and other compatible thin-gauge substrates without pre-tapping. A4...RRP From £9.62RRP From £9.62
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.