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1921_lj9oI2_B18.21.1-lock.jpg
Dimensions in inches: source ASME B18.21.1 -2009-Table 1 Regular series
Nominal washer size
A max
A min
B max
T
mean
section thickness
(t1+t)/2
W min
No.2 (0.086)
0.094 0.088 0.172 0.020 0.035
No.3 (0.099)
0.107 0.101 0.195 0.025 0.040
No.4 (0.112)
0.120 0.114 0.209 0.025 0.040
No.5 (0.125)
0.133 0.127 0.236 0.031 0.047
No.6 (0.138)
0.148 0.141 0.250 0.031 0.047
No.8 (0.164)
No.10 (0.190)
No.12 (0.216)
1/4- (0.250)
5/16- (0.3125)
3/8- (0.375)
7/16-(0.4375)
1/2- (0.5)
9/16- (0.5625)
5/8- (0.625)
11/16- (0.6875)
3/4- (0.75)
13/16-(0.8125)
7/8- (0.875)
15/16 (0.9375)
1- (1)
1-1/16 (1.0625)
1-1/8 (1.125)
1-3/16 (1.875)
1- 1/4 (1.25)
1 - 5/16 (1.3125)
1 - 3/8 (1.375)
1 - 7/16 (1.4375)
1 - 1/2 (1.5)
1 - 5/8 (1.625)
1 - 3/4 (1.75)
1 - 7/8 (1.875)
2 (2)
2 - 1/4 (2.5)
2 - 1/2 (2.5)
2 - 3/4 (2.75)
3 (3)