ASME B18.21.1 Hi Collar Helical Spring Lock Washers
| Nominal Washer Size | Inside Diameter | Outside Diameter | Washer Section | |||
|---|---|---|---|---|---|---|
| Width | Thickness a | |||||
| Min. | Max. | Max. | Min. | Min. | ||
| ASME B18.21.1 - No. 4 | 0.112 | 0.114 | 0.12 | 0.173 | 0.022 | 0.022 |
| ASME B18.21.1 - No. 5 | 0.125 | 0.127 | 0.133 | 0.202 | 0.03 | 0.03 |
| ASME B18.21.1 - No. 6 | 0.138 | 0.141 | 0.148 | 0.216 | 0.03 | 0.03 |
| ASME B18.21.1 - No. 8 | 0.164 | 0.167 | 0.174 | 0.267 | 0.042 | 0.047 |
| ASME B18.21.1 - No. 10 | 0.19 | 0.193 | 0.2 | 0.294 | 0.042 | 0.047 |
| ASME B18.21.1 - 1⁄4 | 0.25 | 0.252 | 0.26 | 0.363 | 0.047 | 0.078 |
| ASME B18.21.1 - 5⁄16 | 0.3125 | 0.314 | 0.322 | 0.457 | 0.062 | 0.093 |
| ASME B18.21.1 - 3⁄8 | 0.375 | 0.377 | 0.385 | 0.55 | 0.076 | 0.125 |
| ASME B18.21.1 - 7⁄16 | 0.4375 | 0.44 | 0.45 | 0.644 | 0.09 | 0.14 |
| ASME B18.21.1 - 1⁄2 | 0.5 | 0.502 | 0.512 | 0.733 | 0.103 | 0.172 |
| ASME B18.21.1 - 5⁄8 | 0.625 | 0.628 | 0.64 | 0.917 | 0.125 | 0.203 |
| ASME B18.21.1 - 3⁄4 | 0.75 | 0.753 | 0.765 | 1.105 | 0.154 | 0.218 |
| ASME B18.21.1 - 7⁄8 | 0.875 | 0.878 | 0.89 | 1.291 | 0.182 | 0.234 |
| ASME B18.21.1 - 1 | 1 | 1.003 | 1.015 | 1.478 | 0.208 | 0.25 |
| ASME B18.21.1 - 1 1⁄8 | 1.125 | 1.129 | 1.144 | 1.663 | 0.236 | 0.313 |
| ASME B18.21.1 - 1 1⁄4 | 1.25 | 1.254 | 1.272 | 1.79 | 0.236 | 0.313 |
| ASME B18.21.1 - 1 3⁄8 | 1.375 | 1.379 | 1.399 | 2.031 | 0.292 | 0.375 |
| ASME B18.21.1 - 1 1⁄2 | 1.5 | 1.504 | 1.524 | 2.159 | 0.292 | 0.375 |
| ASME B18.21.1 - 1 3⁄4 | 1.75 | 1.758 | 1.778 | 2.596 | 0.383 | 0.469 |
| ASME B18.21.1 - 2 | 2 | 2.008 | 2.028 | 2.846 | 0.383 | 0.469 |
| ASME B18.21.1 - 2 1⁄4 | 2.25 | 2.262 | 2.287 | 3.345 | 0.508 | 0.508 |
| ASME B18.21.1 - 2 1⁄2 | 2.5 | 2.512 | 2.537 | 3.559 | 0.508 | 0.508 |
| ASME B18.21.1 - 2 3⁄4 | 2.75 | 2.762 | 2.787 | 4.095 | 0.633 | 0.633 |
| ASME B18.21.1 - 3 | 3 | 3.012 | 3.037 | 4.345 | 0.633 | 0.633 |
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