Machinery's Handbook, 31st Edition
1700 Washers All dimensions are given in inches.*See ANSI/ASME B18.21.1-2009 (R2016) standard for sizes over 1 1 ∕ 2 to 3, inclusive, for regular and heavy helical spring lock washers and over 1 1 ∕ 2 to 2, inclusive, for extra-duty helical spring lock washers. When carbon steel helical spring lock washers are to be hot-dipped galvanized for use with hot-dipped galvanized bolts or screws, they are to be coiled to limits onto inch in excess of those specified in Table 2 and Table 1 for minimum inside diameter and maximum outside diameter. Galvanizing washers under 1 ∕ 4 inch nominal size are not recommended. Tooth Lock Washers: These washers serve to lock fasteners, such as bolts and nuts, to the component parts of an assembly, or increase the friction between the fasteners and the assembly. They are designated in a manner similar to helical spring lock washers, and are available in carbon steel. Dimensions are given in Table 3 and Table 4. Table 3. American National Standard Internal-External Tooth Lock Washers ANSI/ASME B18.21.1-2009 (R2016)
B A
B A
C
C
All dimensions are given in inches except whole numbers under “Size”
Type B
Type A
A
B
A
B
C
C
Inside Diameter Max. Min.
Outside Diameter
Inside Diameter Max. Min.
Outside Diameter
Thickness Max. Min.
Thickness Max. Min.
Size
Max.
Min.
Size
Max.
Min.
0.900 0.865 0.040 0.032 0.985 0.965 0.045 0.037 1.070 1.045 0.050 0.042 1.155 1.130 0.050 0.042 .985 .965 0.045 0.037 1.070 1.045 0.050 0.042 1.155 1.130 0.050 0.042 1.260 1.220 0.050 0.042 1.070 1.045 0.050 0.042 1.155 1.130 0.050 0.042 1.260 1.220 0.055 0.047 1.315 1.290 0.055 0.047 1.260 1.220 0.055 0.047 1.315 1.290 0.055 0.047 1.410 1.380 0.060 0.052 1.620 1.590 0.067 0.059 1.315 1.290 0.055 0.047 1.430 1.380 0.060 0.052 1.620 1.590 0.067 0.059 1.830 1.797 0.067 0.059 1.410 1.380 0.060 0.052 1.620 1.590 0.067 0.059 1.830 1.797 0.067 0.059 1.975 1.935 0.067 0.059
0.475 0.460 0.021 0.016 0.510 0.495 0.021 0.017 0.610 0.580 0.021 0.017 0.510 0.495 0.028 0.023 0.610 0.580 0.028 0.023 0.690 0.670 0.028 0.023 0.610 0.580 0.034 0.028 0.690 0.670 0.034 0.028 0.760 0.740 0.034 0.028 0.610 0.580 0.034 0.028 0.690 0.670 0.040 0.032 0.760 0.740 0.040 0.032 0.900 0.880 0.040 0.032 0.690 0.670 0.040 0.032 0.760 0.725 0.040 0.032 0.900 0.880 0.040 0.032 0.985 0.965 0.045 0.037 0.760 0.725 0.040 0.032 0.900 0.880 0.040 0.032 0.985 0.965 0.045 0.037 1.070 1.045 0.045 0.037
No. 4 (0.112) 0.123 0.115
5 ∕ 16 (0.312)
0.332 0.320
No. 6 (0.138) .150 .0141
3 ∕ 8 (0.375) 0.398 0.384
No. 8 (0.164) 0.176 0.168
7 ∕ 16 (0.438) 0.464 0.448
No. 10 (0.190) 0.204 0.195
1 ∕ 2 (0.500) 0.530 0.512
No. 12 (0.216) 0.231 0.221
9 ∕ 16 (0.562) .596 .576
1 ∕ 4 (0.250) 0.267 0.256
5 ∕ 8 (0.625) .663 .640
All dimensions are given in inches.
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