TABLE 3

Imperial mild steel round washers are flat, low-carbon steel washers sized in fractional inches to accompany traditional imperial thread forms like UNC, UNF, BSW (Whitworth), and BSF.

These are categorised according to BS 3410 where washers are divided into specific tables that govern their dimensional scope and intended utility:

  • Table 3 (Light & Heavy Series): The standard "everyday" imperial engineering washer, functionally tracking like a metric Form A or Form B. They are optimized for general shop floor mechanics and light-to-medium clamp loads.
TABLE 3