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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M12 Flat Washer, Form A ISO 7089 A2 Stainless Steel
In stockThis M12 Form A flat washer is manufactured to ISO 7089 in A2 stainless steel (304 grade). ISO 7089 specifies the normal series flat washer - the standard size paired with the majority of metric bolt...RRP From £6.90RRP From £6.90 -
M12 Flat Washer, Form A ISO 7089 A4 Stainless Steel
In stockThis M12 Form A flat washer is manufactured to ISO 7089 in A4 stainless steel (316 grade). ISO 7089 specifies the normal series flat washer - the standard size paired with the majority of metric bolt...RRP From £5.75RRP From £5.75 -
M12 Flat Washer, Form B BS 4320-B A2 Stainless Steel
In stockThis M12 Form A flat washer is manufactured to BS 4320-B in A2 stainless steel (304 grade). BS 4320-B specifies the normal series flat washer - the standard size paired with the majority of metric bolt...RRP From £3.25RRP From £3.25 -
M12 Flat Washer DIN 9021 A4 Stainless Steel
In stockThis M12 penny washer is manufactured to DIN 9021 in A4 stainless steel (316 grade). DIN 9021 specifies a flat washer with an outside diameter substantially larger than the normal series, for spreading load across soft...RRP From £10.80RRP From £10.80 -
M12 Flat Washer DIN 433 A4 Stainless Steel
In stockThis M12 small series flat washer is manufactured to DIN 433 in A4 stainless steel (316 grade). DIN 433 specifies a flat washer with a reduced outside diameter compared with the normal series, for confined spaces...RRP From £14.11RRP From £14.11 -
M12 Flat Washer ISO 7093-1 A4 Stainless Steel
In stockThis M12 Form A flat washer is manufactured to ISO 7093-1 in A4 stainless steel (316 grade). ISO 7093-1 specifies the normal series flat washer - the standard size paired with the majority of metric bolt...RRP From £22.57RRP From £22.57 -
M12 Flat Washer, Form A DIN 125-A Duplex Stainless Steel
In stockThis M12 Form A flat washer is manufactured to DIN 125-A in stainless steel. DIN 125-A specifies the normal series flat washer - the standard size paired with the majority of metric bolt and nut combinations....RRP From £9.14RRP From £9.14 -
M12 Flat Washer DIN 9021 A2 Stainless Steel
In stockThis M12 penny washer is manufactured to DIN 9021 in A2 stainless steel (304 grade). DIN 9021 specifies a flat washer with an outside diameter substantially larger than the normal series, for spreading load across soft...RRP From £4.02RRP From £4.02 -
M12 External Tooth Washer DIN 6798-A A4 Stainless Steel
In stockThis M12 external tooth lock washer is manufactured to DIN 6798-A in A4 stainless steel (316 grade). DIN 6798-A specifies a washer with serrated teeth projecting around the outer edge, for resisting loosening under vibration. The...RRP From £13.62RRP From £13.62 -
M12 Flat Washer DIN 433 A2 Stainless Steel
In stockThis M12 small series flat washer is manufactured to DIN 433 in A2 stainless steel (304 grade). DIN 433 specifies a flat washer with a reduced outside diameter compared with the normal series, for confined spaces...RRP From £5.78RRP From £5.78 -
M12 External Tooth Washer DIN 6798-A A2 Stainless Steel
In stockThis M12 external tooth lock washer is manufactured to DIN 6798-A in A2 stainless steel (304 grade). DIN 6798-A specifies a washer with serrated teeth projecting around the outer edge, for resisting loosening under vibration. The...RRP From £4.35RRP From £4.35 -
M12 Double Tab Washer DIN 463 A4 Stainless Steel
In stockThis M12 double tab washer is manufactured to DIN 463 in A4 stainless steel (316 grade). DIN 463 specifies two tabs, one bent against the nut and one against the component, for locking where both nut...RRP From £17.28RRP From £17.28 -
M12 External Tooth Washer DIN 6797-A A2 Stainless Steel
In stockThis M12 external tooth lock washer is manufactured to DIN 6797-A in A2 stainless steel (304 grade). DIN 6797-A specifies a washer with twisted teeth around the outer edge, for resisting loosening under vibration. The twisted...RRP From £5.55RRP From £5.55 -
M12 Conical Spring Washer DIN 6796 A2 Stainless Steel
In stockThis M12 spring washer is manufactured to DIN 6796 in A2 stainless steel (304 grade). DIN 6796 specifies a split washer with a rectangular section and offset ends, for maintaining tension under vibration. The split ring...RRP From £3.96RRP From £3.96 -
M12 Curved Spring Washer DIN 128-A A4 Stainless Steel
In stockThis M12 curved spring washer is manufactured to DIN 128-A in A4 stainless steel (316 grade). DIN 128-A specifies a washer curved along its length to act as a light spring, for maintaining tension in a...RRP From £11.59RRP From £11.59 -
M12 Curved Spring Washer DIN 128-A Stainless Steel
In stockThis M12 curved spring washer is manufactured to DIN 128-A in stainless steel. DIN 128-A specifies a washer curved along its length to act as a light spring, for maintaining tension in a joint. The curve...RRP From £7.41RRP From £7.41 -
M12 Conical Spring Washer DIN 6796 A4 Stainless Steel
In stockThis M12 spring washer is manufactured to DIN 6796 in A4 stainless steel (316 grade). DIN 6796 specifies a split washer with a rectangular section and offset ends, for maintaining tension under vibration. The split ring...RRP From £26.14RRP From £26.14 -
M12 Crinkle Washer BS 4463 A2 Stainless Steel
In stockThis M12 crinkle washer is manufactured to BS 4463 in A2 stainless steel (304 grade). BS 4463 specifies a lightly corrugated ring giving spring under the head, for light-duty locking on small fixings. The corrugations compress...RRP From £7.72RRP From £7.72 -
M10 X 50 X 3 Penny Washer A2 Stainless Steel
In stockThis M10 x 50mm penny washer is manufactured in A2 stainless steel (304 grade). The oversized outer diameter spreads the clamping load across a much wider area than a standard washer, bridging oversized or slotted holes...RRP From £7.62RRP From £7.62 -
M12 Conical Seat Washer DIN 6319-D A2 Stainless Steel
In stockThis M12 conical seat washer is manufactured to DIN 6319-D in A2 stainless steel (304 grade). DIN 6319-D specifies a coned seat that lets the fixing sit at an angle, for joints where the bolt is...RRP From £23.34RRP From £23.34 -
M10 X 50 X 1.5 Penny Washer A2 Stainless Steel
In stockThis M10 x 50mm penny washer is manufactured in A2 stainless steel (304 grade). The oversized outer diameter spreads the clamping load across a much wider area than a standard washer, bridging oversized or slotted holes...RRP From £6.51RRP From £6.51 -
M10 X 50 Square Plate Washer A4 Stainless Steel
In stockThis M10 x 50mm square plate washer is manufactured in A4 stainless steel (316 grade). The large square footprint spreads clamping load across a far wider area than a round washer, stopping the nut or bolt...RRP From £21.35RRP From £21.35 -
M10 X 40 X 5 Square Plate Washer A4 Stainless Steel
In stockThis M10 x 40mm square plate washer is manufactured in A4 stainless steel (316 grade). The large square footprint spreads clamping load across a far wider area than a round washer, stopping the nut or bolt...RRP From £15.36RRP From £15.36 -
M10 X 40 X 3 Square Plate Washer A4 Stainless Steel
Out of stockThis M10 x 40mm square plate washer is manufactured in A4 stainless steel (316 grade). The large square footprint spreads clamping load across a far wider area than a round washer, stopping the nut or bolt...RRP From £6.41RRP From £6.41 -
M10 X 50 Square Plate Washer A2 Stainless Steel
Out of stockThis M10 x 50mm square plate washer is manufactured in A2 stainless steel (304 grade). The large square footprint spreads clamping load across a far wider area than a round washer, stopping the nut or bolt...RRP From £13.38RRP From £13.38
Stainless steel washers in A2 (304) and A4 (316), from M1.6 to M64, plus imperial BA and No. gauge sizes. A few flat washers also come in duplex (1.4462) stainless.
- Flat washers: Form A (DIN 125-A and ISO 7089), Forms B, C and D (BS 4320), large diameter washers to DIN 9021 and ISO 7093, small washers to DIN 433, and imperial washers to BS 3410.
- Penny washers with a wide outside diameter to spread load into timber and soft materials.
- Spring and lock washers: rectangular and square section spring washers (DIN 127-B and DIN 7980), curved (DIN 128-A) and conical (DIN 6796) spring washers, internal and external tooth washers, crinkle and wavy washers, and tab washers.
- Specialist washers: bonded sealing washers, square plate washers, taper washers, cup washers, and conical seat and spherical washers.
Frequently asked questions
What types of stainless steel washer does Simfix stock?
Flat washers in Forms A, B, C and D, large and small diameter washers, penny washers, spring washers in rectangular, square, curved and conical forms, tooth, crinkle, wavy and tab lock washers, and specialist washers including bonded sealing, square plate, taper and cup washers. Most come in both A2 (304) and A4 (316).
What is a Form C washer used for?
A Form C washer (BS 4320) has a larger outside diameter than a standard Form A washer, which spreads the clamping load over a wider area. Use it where the material under the bolt head is soft, thin, or has an oversized clearance hole, such as softwood decking or thin sheet. Simfix stocks Form C washers in A2 from M4 to M30, and in A4 in M4, M5, M6, M8, M12, M14, M16, M20, M24, M27, M30, M33 and M36.
Does a spring washer stop a bolt coming loose?
A rectangular section spring washer (DIN 127-B) gives some resistance to loosening under light vibration, by staying under compression as the bolt settles. For joints exposed to significant vibration, such as trailers or machinery, a nyloc (nylon insert) nut gives more reliable resistance than a spring washer alone. Simfix stocks both.
What sizes of stainless steel washer does Simfix stock?
Form A flat washers run from M1.6 to M64 in both A2 (304) and A4 (316). Form B goes up to M39, Form C up to M36, rectangular section spring washers up to M42, and penny washers from M3 to M12. Not every size is held in both grades, and each product listing is a single size.
Sizes, grades and pack quantities vary by product type. Check the individual product listing for the exact specification and current availability.