Description
M2 Stainless Steel Washer, ISO 7089 A2 — BOLTON SKU 72642.
About the M2 Stainless Steel Washer ISO 7089
This item is listed under the internal reference m2 stainless steel washer mpn and is a plain washer manufactured to ISO 7089, the standard covering plain washers of the normal series in product grade A. For the M2 size the standard specifies a 2.2 mm nominal inside diameter, a 5 mm nominal outside diameter and a 0.3 mm nominal thickness, with the finished part falling inside the tolerance bands the standard places around those figures. ISO 7089 covers nominal thread diameters from 1.6 mm to 64 mm and defines hardness classes of 200 HV and 300 HV for steel washers; this part is supplied in A2 austenitic stainless steel rather than plated carbon steel, making it the corrosion-resistant option within the range. BOLTON’s quotation records that this A2 item was offered where A4 stainless was not available. The two grades differ in molybdenum content and therefore in their resistance to chloride attack, so confirm which grade the drawing calls for before substituting.
Key specifications
| Standard | ISO 7089 — plain washers, normal series, product grade A |
|---|---|
| Nominal thread size | M2 |
| Inside diameter (d1) | 2.2 mm nominal |
| Outside diameter (d2) | 5 mm nominal |
| Thickness (h) | 0.3 mm nominal |
| Material | A2 austenitic stainless steel |
| Form | Flat, plain (Form A) |
Typical applications
M2 plain washers are used under screw heads and nuts on small mechanical assemblies, instrument panels, electronic enclosures and light bracketry, spreading the clamping load across the joint face and protecting soft or coated surfaces from scoring as the fastener is turned. At 0.3 mm thick the washer adds negligible stack height, which matters where grip length is tight on a short M2 screw. The A2 grade suits indoor, humid and light outdoor duty; where the assembly sees salt spray or marine exposure, A4 is normally specified instead.
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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