Washer Specifications
Washers are essential components used to distribute load, prevent loosening, and protect contact surfaces in bolted joints. This page outlines commonly used washer types—such as flat washers, square washers, and various locking washers—along with their associated dimensional standards, hardness ranges, and material specifications. Reference data below is based on ASME, ASTM, and DIN standards to support technical planning and procurement decisions. Click the button below to view our full range of washer products.
Dimension Standard
| Washer type | Washer Standard |
|---|---|
| Plain washer (Flat washer, USS washer, SAE washer, Fender washer) | ASME B18.21.1, ASTM F436, DIN125, DIN126, DIN134, ISO7098, DIN433, DIN6916, DIN9021 |
| Spring lock washer | ASME B18.21.1, DIN127, DIN7980 |
| Tooth lock washer | ASME B18.21.1, DIN6797 |
| Square washer | ASME B18.2.6, DIN434, DIN435, DIN436, DIN6917 |
Grade Specification
| Standard for Washer | Hardness | Material |
|---|---|---|
| ASME B18.22.1 USS | Low carbon steel | |
| ASME B18.22.1 SAE | Low carbon steel | |
| F436 | Zinc plated 38-45HRC， HDG 26-45HRC | C1045+ heat treatment |
| DIN125A | CLASS 140HV, 140min HV; CL200HV, 200-300HV; 300HV, 300-400HV | Low carbon steel |
| DIN125B | Low carbon steel | |
| DIN127A | C1070/65Mn | |
| DIN127B | C1070/65Mn | |
| DIN9021 | ≦16mm 140-250HV;﹥16mm 140-250HV | Low carbon steel |
Washer FAQ
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