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Washers

USS/SAE Flat Plain Washer

Dimensions of Preferred Sizes of Type A Plain Washers

Nominal Washer Size Series(1) A B C
Inside Diameter Outside Diameter Thickness
Basic Tolerance Basic Tolerance
Plus Minus Plus Minus Basic Max Min
No. 0 (0.060) ... 0.078 0.000 0.005 0.188 0.000 0.005 0.020 0.025 0.016
No. 2 (0.086) ... 0.094 0.000 0.005 0.250 0.000 0.005 0.020 0.025 0.016
No. 4 (0.112) ... 0.125 0.008 0.005 0.312 0.008 0.005 0.032 0.040 0.025
No. 6 (0.138) ... 0.156 0.008 0.005 0.375 0.015 0.005 0.049 0.065 0.036
No. 8 (0.164) ... 0.188 0.008 0.005 0.438 0.015 0.005 0.049 0.065 0.036
No. 10 (0.190) ... 0.219 0.008 0.005 0.500 0.015 0.005 0.049 0.065 0.036
3/16 (0.188) ... 0.250 0.015 0.005 0.562 0.015 0.005 0.049 0.065 0.036
No. 12 (0.216) ... 0.250 0.015 0.005 0.562 0.015 0.005 0.065 0.080 0.051
1/4 (0.250) N 0.281 0.015 0.005 0.625 0.015 0.005 0.065 0.080 0.051
1/4 (0.250) W 0.312 0.015 0.005 0.734(2) 0.015 0.007 0.065 0.080 0.051
5/16 (0.312) N 0.344 0.015 0.005 0.688 0.015 0.007 0.065 0.080 0.051
5/16 (0.312) W 0.375 0.015 0.005 0.875 0.030 0.007 0.083 0.104 0.064
3/8 (0.375) N 0.406 0.015 0.005 0.812 0.015 0.007 0.065 0.080 0.051
3/8 (0.375) W 0.438 0.015 0.005 1.000 0.030 0.007 0.083 0.104 0.064
7/16 (0.438) N 0.469 0.015 0.005 0.922 0.015 0.007 0.065 0.080 0.051
7/16 (0.438) W 0.500 0.015 0.005 1.250 0.030 0.007 0.083 0.104 0.064
1/2 (0.500) N 0.531 0.015 0.005 1.062 0.030 0.007 0.095 0.121 0.074
1/2 (0.500) W 0.562 0.015 0.005 1.375 0.030 0.007 0.109 0.132 0.086
9/16 (0.562) N 0.594 0.015 0.005 1.156(2) 0.030 0.007 0.095 0.121 0.074
9/16 (0.562) W 0.625 0.015 0.005 1.469(2) 0.030 0.007 0.109 0.132 0.086