ASME B18.21.1 External Tooth Lock Washers
ASME B18.21.1 External Tooth Lock Washers
Standard covers the dimensional requirements, physical properties, and related test methods for helical
spring-lock washers (#0 through 3 in.), tooth-lock washers (#2 through 1 3/4 in.), and plain washers (#0
through 3 in.).
The inclusion of dimensional data in ASME B18.21.1 Standard is not intended to imply that all
products described are stock production items. Consumers should consult with suppliers concerning the
availability of products.
ASME B18.21.1 External Tooth Lock Washers Dimensions (mm)
| Nominal Size | Inside Diameter, A | Outside Diameter, B | Thickness, C | |||
|---|---|---|---|---|---|---|
| Max. | Min. | Max. | Min. | Max. | Min. | |
| ASME B18.21.1 #3 (0.099) | 2.769 | 2.591 | 5.969 | 5.588 | 0.406 | 0.254 |
| ASME B18.21.1 #4 (0.112) | 3.124 | 2.921 | 6.604 | 6.223 | 0.457 | 0.305 |
| ASME B18.21.1 #5 (0.125) | 3.454 | 3.277 | 7.239 | 6.858 | 0.508 | 0.356 |
| ASME B18.21.1 #6 (0.138) | 3.810 | 3.581 | 8.128 | 7.747 | 0.559 | 0.406 |
| ASME B18.21.1 #8 (0.164) | 4.470 | 4.267 | 9.677 | 9.271 | 0.584 | 0.457 |
| ASME B18.21.1 #10 (0.190) | 5.182 | 4.953 | 10.414 | 10.033 | 0.610 | 0.457 |
| ASME B18.21.1 #12 (0.216) | 5.867 | 5.613 | 12.065 | 11.684 | 0.686 | 0.508 |
| ASME B18.21.1 1⁄4 (0.250) | 6.782 | 6.502 | 12.954 | 12.548 | 0.711 | 0.584 |
| ASME B18.21.1 5⁄16 (0.3125) | 8.433 | 8.128 | 15.494 | 14.935 | 0.864 | 0.711 |
| ASME B18.21.1 3⁄8 (0.375) | 10.109 | 9.754 | 17.628 | 17.018 | 1.016 | 0.813 |
| ASME B18.21.1 7⁄16 (0.4375) | 11.786 | 11.379 | 19.304 | 18.796 | 1.016 | 0.813 |
| ASME B18.21.1 1⁄2 (0.500) | 13.462 | 13.030 | 22.860 | 22.352 | 1.143 | 0.940 |
| ASME B18.21.1 9⁄16 (0.5625) | 15.138 | 14.630 | 25.019 | 24.384 | 1.143 | 0.940 |
| ASME B18.21.1 5⁄8 (0.625) | 16.840 | 16.281 | 27.178 | 26.543 | 1.270 | 1.067 |
| ASME B18.21.1 11⁄16 (0.6875) | 18.491 | 17.882 | 29.337 | 28.702 | 1.270 | 1.067 |
| ASME B18.21.1 3⁄4 (0.750) | 20.193 | 19.507 | 32.004 | 30.988 | 1.397 | 1.194 |
| ASME B18.21.1 13⁄16 (0.8125) | 21.869 | 21.158 | 33.401 | 32.766 | 1.397 | 1.194 |
| ASME B18.21.1 7⁄8 (0.875) | 23.546 | 22.784 | 35.814 | 35.052 | 1.524 | 1.321 |
| ASME B18.21.1 1 (1.000) | 26.924 | 26.035 | 41.148 | 40.386 | 1.702 | 1.499 |
ASME B18.21.1 External Tooth Lock Washers Dimensions (Inch)
| Nominal Size | Inside Diameter, A | Outside Diameter, B | Thickness, C | |||
|---|---|---|---|---|---|---|
| Max. | Min. | Max. | Min. | Max. | Min. | |
| ASME B18.21.1 #3 (0.099) | 2.769 | 2.591 | 5.969 | 5.588 | 0.406 | 0.254 |
| ASME B18.21.1 #4 (0.112) | 3.124 | 2.921 | 6.604 | 6.223 | 0.457 | 0.305 |
| ASME B18.21.1 #5 (0.125) | 3.454 | 3.277 | 7.239 | 6.858 | 0.508 | 0.356 |
| ASME B18.21.1 #6 (0.138) | 3.810 | 3.581 | 8.128 | 7.747 | 0.559 | 0.406 |
| ASME B18.21.1 #8 (0.164) | 4.470 | 4.267 | 9.677 | 9.271 | 0.584 | 0.457 |
| ASME B18.21.1 #10 (0.190) | 5.182 | 4.953 | 10.414 | 10.033 | 0.610 | 0.457 |
| ASME B18.21.1 #12 (0.216) | 5.867 | 5.613 | 12.065 | 11.684 | 0.686 | 0.508 |
| ASME B18.21.1 1⁄4 (0.250) | 6.782 | 6.502 | 12.954 | 12.548 | 0.711 | 0.584 |
| ASME B18.21.1 5⁄16 (0.3125) | 8.433 | 8.128 | 15.494 | 14.935 | 0.864 | 0.711 |
| ASME B18.21.1 3⁄8 (0.375) | 10.109 | 9.754 | 17.628 | 17.018 | 1.016 | 0.813 |
| ASME B18.21.1 7⁄16 (0.4375) | 11.786 | 11.379 | 19.304 | 18.796 | 1.016 | 0.813 |
| ASME B18.21.1 1⁄2 (0.500) | 13.462 | 13.030 | 22.860 | 22.352 | 1.143 | 0.940 |
| ASME B18.21.1 9⁄16 (0.5625) | 15.138 | 14.630 | 25.019 | 24.384 | 1.143 | 0.940 |
| ASME B18.21.1 5⁄8 (0.625) | 16.840 | 16.281 | 27.178 | 26.543 | 1.270 | 1.067 |
| ASME B18.21.1 11⁄16 (0.6875) | 18.491 | 17.882 | 29.337 | 28.702 | 1.270 | 1.067 |
| ASME B18.21.1 3⁄4 (0.750) | 20.193 | 19.507 | 32.004 | 30.988 | 1.397 | 1.194 |
| ASME B18.21.1 13⁄16 (0.8125) | 21.869 | 21.158 | 33.401 | 32.766 | 1.397 | 1.194 |
| ASME B18.21.1 7⁄8 (0.875) | 23.546 | 22.784 | 35.814 | 35.052 | 1.524 | 1.321 |
| ASME B18.21.1 1 (1.000) | 26.924 | 26.035 | 41.148 | 40.386 | 1.702 | 1.499 |
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