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 X 50 Square Plate Washer A2 Stainless Steel
Out of stockThis M12 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 £14.27RRP From £14.27 -
M12 X 50 X 5 Penny Washer A2 Stainless Steel
In stockThis M12 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 £13.20RRP From £13.20 -
M12 X 45 Penny Washer A2 Stainless Steel
Out of stockThis M12 x 45mm 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 £11.46RRP From £11.46 -
M12 X 40 Penny Washer A4 Stainless Steel
In stockThis M12 x 40mm 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 £6.74RRP From £6.74 -
M12 X 50 X 1.5 Penny Washer A2 Stainless Steel
In stockThis M12 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 £7.95RRP From £7.95 -
M12 X 40 Square Plate Washer A4 Stainless Steel
In stockThis M12 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 £25.60RRP From £25.60 -
M12 X 35 Penny Washer A2 Stainless Steel
In stockThis M12 x 35mm 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 £3.78RRP From £3.78 -
M12 X 40 Penny Washer A2 Stainless Steel
In stockThis M12 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 £6.32RRP From £6.32 -
M12 X 30 Penny Washer A2 Stainless Steel
In stockThis M12 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 £4.39RRP From £4.39 -
M12 Taper Washer A4 Stainless Steel
In stockThis M12 taper washer is manufactured in A4 stainless steel (316 grade). The taper compensates for the slope of a channel or joist flange so the bolt head or nut bears square to the fastener axis,...RRP From £27.79RRP From £27.79 -
M12 Square Sect Spring Washer DIN 7980 Stainless Steel
In stockThis M12 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 £3.23RRP From £3.23 -
M12 Turned Cup Washer NF E 27-619 Stainless Steel
In stockThis M12 turned cup washer is manufactured to NF E 27-619 in stainless steel. NF E 27-619 specifies a machined dished washer that receives a countersunk head, for a flush countersunk finish on a surface too...RRP From £35.21RRP From £35.21 -
M12 Wavey Washer DIN 137-B Stainless Steel
In stockThis M12 wave washer is manufactured to DIN 137-B in stainless steel. DIN 137-B specifies a ring waved along its circumference to act as a light spring, for taking up play and light axial preload. The...RRP From £5.57RRP From £5.57 -
M12 Washer For Bolt DIN 7349 A2 Stainless Steel
In stockThis M12 heavy flat washer is manufactured to DIN 7349 in A2 stainless steel (304 grade). DIN 7349 specifies a thick flat washer for use with bolts under high load, for distributing heavy clamping forces. The...RRP From £7.24RRP From £7.24 -
M12 Single Tab Washer DIN 93 A4 Stainless Steel
In stockThis M12 single tab washer is manufactured to DIN 93 in A4 stainless steel (316 grade). DIN 93 specifies a washer with one tab that is bent up against the nut flat, for a positive mechanical...RRP From £8.63RRP From £8.63 -
M12 Retaining Ring Washer DIN 6799 Martensitic Stainless Steel
In stockThis M12 retaining ring washer is manufactured to DIN 6799 in stainless steel. DIN 6799 specifies a sprung E-shaped ring that snaps into a shaft groove, for locating a component on a shaft without a thread....RRP From £17.34RRP From £17.34 -
M12 Internal Tooth Washer DIN 6798-J A4 Stainless Steel
In stockThis M12 internal tooth lock washer is manufactured to DIN 6798-J in A4 stainless steel (316 grade). DIN 6798-J specifies a washer with serrated teeth projecting inward around the bore, for resisting loosening where the teeth...RRP From £6.06RRP From £6.06 -
M12 Square Sect Spring Washer DIN 7980 A4 Stainless Steel
In stockThis M12 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 £2.61RRP From £2.61 -
M12 Single Tab Washer DIN 93 A2 Stainless Steel
In stockThis M12 single tab washer is manufactured to DIN 93 in A2 stainless steel (304 grade). DIN 93 specifies a washer with one tab that is bent up against the nut flat, for a positive mechanical...RRP From £6.99RRP From £6.99 -
M12 Flat Washer, Form D BS 4320-D A2 Stainless Steel
In stockThis M12 Form A flat washer is manufactured to BS 4320-D in A2 stainless steel (304 grade). BS 4320-D specifies the normal series flat washer - the standard size paired with the majority of metric bolt...RRP From £6.86RRP From £6.86 -
M12 Internal Tooth Washer DIN 6798-J A2 Stainless Steel
In stockThis M12 internal tooth lock washer is manufactured to DIN 6798-J in A2 stainless steel (304 grade). DIN 6798-J specifies a washer with serrated teeth projecting inward around the bore, for resisting loosening where the teeth...RRP From £3.76RRP From £3.76 -
M12 Internal Tooth Washer DIN 6797-J A2 Stainless Steel
In stockThis M12 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 £5.55RRP From £5.55 -
M12 Safety Locking Washer, Type S A2 Stainless Steel
In stockThis M12 safety locking washer is manufactured in A2 stainless steel (304 grade). The cam faces between the pair are steeper than the thread pitch, so any attempt to turn the nut has to lift the...RRP From £3.62RRP From £3.62 -
M12 Flat Washer, Form B BS 4320-B A4 Stainless Steel
In stockThis M12 Form A flat washer is manufactured to BS 4320-B in A4 stainless steel (316 grade). BS 4320-B specifies the normal series flat washer - the standard size paired with the majority of metric bolt...RRP From £3.07RRP From £3.07 -
M12 Rect Sect Spring Washer DIN 127-B Stainless Steel
In stockThis M12 spring washer is manufactured to DIN 127-B in stainless steel. DIN 127-B specifies a split washer with a rectangular section and offset ends, for maintaining tension under vibration. The split ring is compressed flat...RRP From £3.07RRP From £3.07
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.