GB/T 861.1-1987

Internal teeth lock washers

GB/T 861.2-1987

Serrated lock washers internal teeth

GB/T 862.2-1987

Serrated lock washers external teeth

GB/T 860-1987

Curved spring washers

GB/T 955-1987

Wave spring washers

GB/T 862.1-1987

Lock washers external teeth

GB/T 956.1-1987

Countersunk external toothed lock washers

GB/T 956.2-1987

Countersunk external serrated lock washers

GB/T 9074.27-1988

Serrated lock washer external teeth for assembly

GB/T 9074.28-1988

Countersunk external toothed lock washer for assembly