Description
Washer Flat M3 Stainless Steel A2-70 ISO 7089 / DIN 125 — BOLTON SKU 65561.
About the Washer Flat M3 Stainless Steel A2-70
This washer flat size m3 stainless steel item is a plain Form A washer made to ISO 7089, the international standard that fasteners.eu lists as equivalent to DIN 125-1 and DIN 125-2. For nominal size M3 the standard fixes an inside diameter of 3.2 mm, an outside diameter of 7 mm and a thickness of 0.5 mm, so the washer seats on an M3 screw or bolt and spreads the clamp load over a wider bearing area than the fastener head alone. ISO 7089 covers steel washers in 140 HV, 200 HV and 300 HV hardness classes as well as stainless A2 and A4, brass, aluminium and plastic variants; this line is the austenitic stainless option, listed by the supplier under the A2-70 designation. Grade documentation and any batch traceability are confirmed at quotation.
Key specifications
| Attribute | Value |
|---|---|
| Standard | ISO 7089 (plain washer, Form A) |
| Equivalent standard | DIN 125-1 / DIN 125-2 |
| Nominal size | M3 |
| Inside diameter (d1) | 3.2 mm |
| Outside diameter (d2) | 7 mm |
| Thickness (h) | 0.5 mm |
| Material | A2 austenitic stainless steel (listed as A2-70) |
Typical applications
At M3 the washer is a small-hardware item used under panel screws, bracket fixings, PCB standoffs, cover plates and light structural or enclosure assemblies where the fastener head would otherwise bear directly on thin sheet or a soft substrate. The A2 stainless option is chosen where the joint sees humidity, wash-down or outdoor exposure and a plated carbon-steel washer would corrode ahead of the surrounding structure. Because the 0.5 mm thickness is fixed by the standard, it is also a predictable shim under M3 heads where a small, repeatable stack-up allowance is needed.
Supplied by BOLTON Technical Equipment Supplies against request for quotation. Add this item to your RFQ basket to request pricing, lead time and documentation requirements (e.g. CoC, datasheets or test reports where applicable).
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