F436 Structural Flat Washer, Plain (inch)

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Nominal Size (Bolt Size)    Outer Diameter    Inner Diameter    Thickness
1/4 inch    0.594 in (15.08 mm)       0.265 in (6.73 mm)    0.052 in (1.32 mm)
5/16 inch    0.718 in (18.26 mm)    0.328 in (8.33 mm)    0.058 in (1.47 mm)
3/8 inch    0.844 in (21.43 mm)    0.406 in (10.31 mm)    0.062 in (1.57 mm)
1/2 inch    1.000 in (25.40 mm)    0.500 in (12.70 mm)    0.062 in (1.57 mm)
5/8 inch    1.250 in (31.75 mm)    0.625 in (15.88 mm)    0.062 in (1.57 mm)
3/4 inch    1.500 in (38.10 mm)    0.750 in (19.05 mm)    0.062 in (1.57 mm)
1 inch    2.000 in (50.80 mm)    1.000 in (25.40 mm)    0.062 in (1.57 mm)