This is a type of washer used at the tightening position of bolts or nuts. Due to its conical (dish-shaped) form, it creates a spring-like elastic effect, helping to prevent loosening in bolted joints.
※ It is classified into 2 types according to bolt shape:
Type 1 (1種): used for standard bolts Type 2 (2種): used for socket head cap screws → They differ in outer diameter
※ Classified by load:
Light-duty type: suitable for tightening force of 4T class bolts Heavy-duty type: suitable for tightening force of 8T class bolts
※ Difference from “皿バネ (disc spring)”:
皿バネ座金: a washer used in bolted fastening applications 皿バネ: a conical spring used in stacks to achieve specific load–deflection characteristics according to design requirements
