This standard prescribes the requirements for plain washers for general engineering purposes. It covers the dimensions, materials, and designation systems for machined and punched washers used with metric bolts, screws, and nuts.
Covers the dimensions and other requirements for plain washers for general engineering purposes.
Quick Reference Values
size range1.7 mm to 155 mm inside diameter
steel washer hardness100 to 250 HV
chamfer angle machined washers30 to 45 degrees
Practical Notes
Ensure washer material is galvanically compatible with the bolt to prevent corrosion.
Punched washers (Type A and B) are typical for structural steelwork, whereas machined washers are used in precision machinery.
Type A is used for normal clearance holes, while Type B is suited for large clearance or slotted holes.