Description
Flat Washer M10 x 10.5 x 21 mm, Stainless Steel A4, DIN 125 — BOLTON SKU 64414.
About the Flat Washer M10 x 10.5 x 21
This Flat Washer M10 x 10.5 x 21 mm is a plain washer to the DIN 125 pattern in A4 stainless steel. It has a 10.5 mm inside diameter to clear an M10 fastener and a 21 mm outside diameter, distributing the bolt load over a wider bearing area and protecting the joint surface from marking as the fastener is tightened. A4 is the marine grade of the austenitic stainless-steel fastener classes (316 type), specified where fastenings face chlorides, salt spray or chemical exposure beyond what the general-purpose A2 grade tolerates. Plain washers to the DIN 125 pattern are the default flat washer used under metric hex and socket-head fasteners. Matching the washer grade to the bolt and nut grade preserves the corrosion resistance of the complete fastener stack. BOLTON supplies this washer against request for quotation, with certificates of conformity available where required.
Key specifications
| Nominal size | M10 |
|---|---|
| Inside diameter | 10.5 mm |
| Outside diameter | 21 mm |
| Material | Stainless steel A4 (316 type) |
| Pattern | DIN 125 plain washer |
Typical applications
Used under M10 bolt heads and nuts in coastal, marine and chemically aggressive environments — external structures, deck and dockside equipment, and process plant — where an A4 washer is fitted with A4 bolts and nuts so no element of the joint becomes the corrosion weak point.
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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