Flat washer dimensions are shown in the following chart according to ASME B18.21.1-2009 standard. Flat washers from #0 to 3 inches nominal size with A and
B types are covered in the chart.
Type A flat washers serve to minimize embedding and to help tightening. The
Type B flat washers fulfill the customary purpose of
distributing load over larger areas of lower strength
Some important notes from the ASME B18.21.1:
- Flat washers shall be made of low carbon steel, stainless steel, non-ferrous
metal, plastic, or other material as specified by the purchaser. The tolerances
given by the calculator are intended for metallic washers only.
- Hardened flat washers shall conform to the chemical and mechanical
requirements in ASTM F 436.