Description
Washer M10-A4 10×20 Steel Grade A ISO 7089 — BOLTON SKU 56359.
About the Washer M10-A4 10×20 Steel Grade A ISO
This Washer M10-A4 10×20 Steel Grade A item is a plain flat washer manufactured to ISO 7089, the international standard for normal-series flat washers without chamfer, equivalent in pattern to DIN 125 form A. Sized for M10 fasteners, the ISO 7089 washer for this thread carries a nominal clearance hole of 10.5 mm, an outside diameter of 20 mm and a thickness of 2 mm — matching the 10×20 size code in the designation. Product grade A denotes the tighter tolerance class of the standard, and the washer is supplied in steel; ISO 7089 washers are produced in defined hardness classes, commonly 200 HV for standard steel parts. A flat washer of this pattern spreads the bolt-head or nut bearing load over a larger area and protects the clamped surface during tightening.
Key specifications
| Standard | ISO 7089 (pattern equivalent: DIN 125 A) |
|---|---|
| Nominal size | M10 |
| Inside diameter | 10.5 mm nominal |
| Outside diameter | 20 mm |
| Thickness | 2 mm |
| Product grade | A |
| Material | Steel |
Typical applications
Used under M10 bolt heads and nuts across structural, machinery and equipment assembly to distribute clamping load and prevent damage to the joint face. Stocked as a standard hardware item in maintenance stores and fastener kits alongside M10 bolts and nuts.
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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