Description
Washer M3, Stainless Steel A4, ISO 7089 — BOLTON SKU 60886.
About the Washer M3, Stainless Steel A4, ISO 7089
This Washer M3 Stainless Steel A4 ISO 7089 part is a plain flat washer of the normal series, product grade A, as defined by ISO 7089. For the M3 size the standard specifies a 3.2 mm inside diameter, a 7.0 mm outside diameter and a 0.5 mm thickness, dimensions that match ISO metric M3 bolts and screws. A flat washer of this type distributes the clamping load of the fastener head or nut over a larger bearing area, protects the mating surface from scoring during tightening and helps maintain preload on softer or painted surfaces. The A4 austenitic stainless material is molybdenum-alloyed for improved resistance to chlorides and marine atmospheres, making it the natural pairing for A4 screws and nuts.
Key specifications
| Standard | ISO 7089 (plain washer, normal series, grade A) |
|---|---|
| Nominal size | M3 |
| Inside diameter | 3.2 mm |
| Outside diameter | 7.0 mm |
| Thickness | 0.5 mm |
| Material | Stainless steel A4 |
Typical applications
M3 plain washers are fitted under screw heads and nuts throughout instrument, enclosure and light mechanical assembly work to spread bearing load and protect finished surfaces. In A4 stainless they are used alongside A4 fasteners in corrosion-sensitive installations such as coastal plants and external equipment housings, keeping the whole fastened joint in a single corrosion-resistant grade.
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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