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Thread Depth Calculations
TPI | 29 degree | 29.5 degree | 30 degree | Minor = Major - |
4 | 0.1855 | 0.1865 | 0.1875 | 0.3067 |
5 | 0.1484 | 0.1492 | 0.1500 | 0.2454 |
6 | 0.1237 | 0.1243 | 0.1250 | 0.2045 |
7 | 0.1060 | 0.1066 | 0.1071 | 0.1753 |
8 | 0.0927 | 0.0932 | 0.0938 | 0.1534 |
9 | 0.0824 | 0.0829 | 0.0833 | 0.1363 |
10 | 0.0742 | 0.0746 | 0.0750 | 0.1227 |
11 | 0.0675 | 0.0678 | 0.0682 | 0.1115 |
12 | 0.0618 | 0.0622 | 0.0625 | 0.1022 |
13 | 0.0571 | 0.0574 | 0.0577 | 0.0944 |
14 | 0.0530 | 0.0533 | 0.0536 | 0.0876 |
15 | 0.0495 | 0.0497 | 0.0500 | 0.0818 |
16 | 0.0464 | 0.0466 | 0.0469 | 0.0767 |
17 | 0.0436 | 0.0439 | 0.0441 | 0.0722 |
18 | 0.0412 | 0.0414 | 0.0417 | 0.0682 |
19 | 0.0391 | 0.0393 | 0.0395 | 0.0646 |
20 | 0.0371 | 0.0373 | 0.0375 | 0.0613 |
21 | 0.0353 | 0.0355 | 0.0357 | 0.0584 |
22 | 0.0337 | 0.0339 | 0.0341 | 0.0558 |
23 | 0.0323 | 0.0324 | 0.0326 | 0.0533 |
24 | 0.0309 | 0.0311 | 0.0312 | 0.0511 |
25 | 0.0297 | 0.0298 | 0.0300 | 0.0491 |
26 | 0.0285 | 0.0287 | 0.0288 | 0.0472 |
27 | 0.0275 | 0.0276 | 0.0278 | 0.0454 |
28 | 0.0265 | 0.0266 | 0.0268 | 0.0438 |
29 | 0.0256 | 0.0257 | 0.0259 | 0.0423 |
30 | 0.0247 | 0.0249 | 0.0250 | 0.0409 |
31 | 0.0239 | 0.0241 | 0.0242 | 0.0396 |
32 | 0.0232 | 0.0233 | 0.0234 | 0.0383 |
33 | 0.0225 | 0.0226 | 0.0227 | 0.0372 |
34 | 0.0218 | 0.0219 | 0.0221 | 0.0361 |
35 | 0.0212 | 0.0213 | 0.0214 | 0.0351 |
36 | 0.0206 | 0.0207 | 0.0208 | 0.0341 |
37 | 0.0201 | 0.0202 | 0.0203 | 0.0332 |
38 | 0.0195 | 0.0196 | 0.0197 | 0.0323 |
39 | 0.0190 | 0.0191 | 0.0192 | 0.0315 |
40 | 0.0186 | 0.0186 | 0.0187 | 0.0307 |
eg. 0.500 major diameter 20 TPI the minor is 0.4387
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