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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M8 Flat Washer, Form A DIN 125-A A2 Stainless Steel
In stockM8 flat washer in A2 stainless steel to DIN 125-A. Spreads clamping load under bolt heads and nuts, protecting timber, aluminium, and plastic substrates from damage. Good corrosion resistance for indoor and general outdoor assemblies. Free...RRP From £2.69RRP From £2.69 -
M10 Flat Washer, Form A DIN 125-A A4 Stainless Steel
In stockM10 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 £3.50RRP From £3.50 -
M5 Flat Washer, Form A DIN 125-A A2 Stainless Steel
In stockM5 flat washer in A2 stainless steel to DIN 125-A. Spreads clamping load under bolt heads and nuts, protecting timber, aluminium, and plastic substrates from damage. Good corrosion resistance for indoor and general outdoor assemblies. Free...RRP From £2.58RRP From £2.58 -
M10 Flat Washer, Form C BS4320-C A2 Stainless Steel
In stockM10 flat washer (Form C, large OD) in A2 stainless steel to BS4320-C. The large outer diameter covers oversized holes and spreads clamping load over a wider bearing area than a standard Form A washer of...RRP From £2.39RRP From £2.39 -
M8 Flat Washer, Form C BS4320-C A2 Stainless Steel
In stockM8 flat washer (Form C, large OD) in A2 stainless steel to BS4320-C. The large outer diameter covers oversized holes and spreads clamping load over a wider bearing area than a standard Form A washer of...RRP From £3.00RRP From £3.00 -
M6 Square Sect Spring Washer DIN 7980 A4 Stainless Steel
In stockThis M6 spring washer is manufactured to DIN 7980 in A4 stainless steel (316 grade). DIN 7980 specifies a split washer with a rectangular section and offset ends, for maintaining tension under vibration. The split ring...RRP From £2.71RRP From £2.71 -
M6 Flat Washer, Form C BS4320-C A4 Stainless Steel
In stockM6 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 £6.59RRP From £6.59 -
M6 Flat Washer, Form A DIN 125-A A4 Stainless Steel
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 £2.32RRP From £2.32 -
M6 Flat Washer, Form A DIN 125-A A2 Stainless Steel
In stockM6 flat washer in A2 stainless steel to DIN 125-A. Spreads clamping load under bolt heads and nuts, protecting timber, aluminium, and plastic substrates from damage. Good corrosion resistance for indoor and general outdoor assemblies. Free...RRP From £2.66RRP From £2.66 -
M8 X 40 Penny Washer A2 Stainless Steel
In stockThis M8 x 40mm 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 £3.15RRP From £3.15 -
M8 X 30 Penny Washer A4 Stainless Steel
In stockThis M8 x 30mm penny washer is manufactured in A4 stainless steel (316 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 £7.46RRP From £7.46 -
M6 X 50 Penny Washer A2 Stainless Steel
In stockThis M6 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 £8.51RRP From £8.51 -
M6 X 30 Penny Washer A2 Stainless Steel
In stockThis M6 x 30mm 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 £2.59RRP From £2.59 -
M6 Square Sect Spring Washer DIN 7980 Stainless Steel
In stockThis M6 spring washer is manufactured to DIN 7980 in stainless steel. DIN 7980 specifies a split washer with a rectangular section and offset ends, for maintaining tension under vibration. The split ring is compressed flat...RRP From £2.89RRP From £2.89 -
M6 Flat Washer DIN 433 A4 Stainless Steel
In stockThis M6 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 £5.30RRP From £5.30 -
M6 External Tooth Washer DIN 6798-A A2 Stainless Steel
In stockThis M6 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 £2.39RRP From £2.39 -
M5 External Tooth Washer DIN 6798-A A2 Stainless Steel
In stockThis M5 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 £2.33RRP From £2.33 -
M4 Flat Washer, Form C BS 4320-C A4 Stainless Steel
In stockThis M4 Form A flat washer is manufactured to BS 4320-C in A4 stainless steel (316 grade). BS 4320-C specifies the normal series flat washer - the standard size paired with the majority of metric bolt...RRP From £6.66RRP From £6.66 -
M12 X 35 Penny Washer A4 Stainless Steel
In stockThis M12 x 35mm penny washer is manufactured in A4 stainless steel (316 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 £4.21RRP From £4.21 -
M10 Internal Tooth Washer DIN 6797-J A2 Stainless Steel
In stockThis M10 external tooth lock washer is manufactured to DIN 6797-J in A2 stainless steel (304 grade). DIN 6797-J specifies a washer with twisted teeth around the outer edge, for resisting loosening under vibration. The twisted...RRP From £5.37RRP From £5.37 -
6.2 X 16 Bonded Sealing Washer A2 Stainless Steel
In stockThis 6.2 x 16mm bonded sealing washer is manufactured in A2 stainless steel (304 grade). As the fastener is tightened the elastomer is compressed into the joint face and around the shank, forming a seal that...RRP From £6.79RRP From £6.79 -
5/8" Flat Washer, Table 3 Light BS 3410 A2 Stainless Steel
In stockThis 5/8" Form A flat washer is manufactured to BS 3410 in A2 stainless steel (304 grade). BS 3410 specifies the normal series flat washer - the standard size paired with the majority of metric bolt...RRP From £24.10RRP From £24.10 -
5/16" Flat Washer, Table 3 Light BS 3410 A2 Stainless Steel
In stockThis 5/16" Form A flat washer is manufactured to BS 3410 in A2 stainless steel (304 grade). BS 3410 specifies the normal series flat washer - the standard size paired with the majority of metric bolt...RRP From £3.23RRP From £3.23 -
1/2" Flat Washer, Table 3 Light BS 3410 A2 Stainless Steel
In stockThis 1/2" Form A flat washer is manufactured to BS 3410 in A2 stainless steel (304 grade). BS 3410 specifies the normal series flat washer - the standard size paired with the majority of metric bolt...RRP From £7.12RRP From £7.12 -
M10 Rect Sect Spring Washer DIN 127-B A4 Stainless Steel
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 £3.54RRP From £3.54
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.