(520) 505-4420
(520) 505-4420
Taps-Dies-Gages
TAP DRILL SIZES
(inches)
CUT THREADS |
FORMED |
||||||
THREAD |
UP TO 2/3 MAJ DIA * | 2/3 TO 1 1/2 MAJ DIA * | 1 1/2 TO 3 MAJ DIA * | ||||
Min |
Max |
Min |
Max |
Min |
Max |
||
| 1.40 UNM | 0.0439 |
0.0455 |
0.0450 |
0.0471 |
0.0460 |
0.0481 |
0.0498 |
| 1.20 UNM | 0.0379 |
0.0393 |
0.0388 |
0.0406 |
0.0397 |
0.0415 |
0.0438 |
| 1.10 UNM | 0.0340 |
0.0354 |
0.0349 |
0.0367 |
0.0358 |
0.0376 |
0.0397 |
| 1.00 UNM | 0.0300 |
0.0314 |
0.0309 |
0.0327 |
0.0319 |
0.0337 |
0.0358 |
| 0.90 UNM | 0.0270 |
0.0283 |
0.0279 |
0.0295 |
0.0287 |
0.0304 |
0.0318 |
| 0.80 UNM | 0.0241 |
0.0252 |
0.0248 |
0.0263 |
0.0256 |
0.0270 |
0.0283 |
| 0.70 UNM | 0.0211 |
0.0221 |
0.0217 |
0.0231 |
0.0224 |
0.0237 |
0.0248 |
| 0.60 UNM | 0.0181 |
0.0190 |
0.0187 |
0.0198 |
0.0193 |
0.0204 |
0.0212 |
| 0.55 UNM | 0.0170 |
0.0178 |
0.0176 |
0.0186 |
0.0181 |
0.0191 |
0.0195 |
| 0.50 UNM | 0.0150 |
0.0158 |
0.0156 |
0.0166 |
0.0161 |
0.0171 |
|
| 0.45 UNM | 0.0141 |
0.0147 |
0.0145 |
0.0154 |
0.0149 |
0.0158 |
|
| 0.40 UNM | 0.0121 |
0.0127 |
0.0125 |
0.0134 |
0.0130 |
0.0138 |
|
| 0.35 UNM | 0.0105 |
0.0111 |
0.0109 |
0.0117 |
0.0113 |
0.0121 |
|
| 0.30 UNM | 0.0089 |
0.0095 |
0.0093 |
0.0100 |
0.0096 |
0.0104 |
|
| 00-90 | 0.0358 |
0.0380 |
0.0374 |
0.0395 |
0.0385 |
0.0405 |
0.0426 |
| 00-96 | 0.0371 |
0.0385 |
0.0381 |
0.0400 |
0.0390 |
0.0409 |
0.0429 |
| 00-112 | 0.0386 |
0.0398 |
0.0394 |
0.0410 |
0.0402 |
0.0419 |
0.0435 |
| 000-120 | 0.0261 |
0.0273 |
0.0270 |
0.0280 |
0.0277 |
0.0293 |
0.0306 |
| 0000-160 | 0.0151 |
0.0160 |
0.0157 |
0.0170 |
0.0164 |
0.0176 |
0.0184 |
Because these small taps are fragile, it is recommended that 75% thread be adopted only for soft materials and short threaded holes. As the length of the hole increases, the percentage of thread should be decreased. The depth of the hole to be threaded (*) as a function of the major diameter is provided in three groups and each group has a minimum and maximum for tap drill size. The minimum diameter should be used for soft and ductile materials and the maximum drill diameter for harder and more difficult materials. In many cases the hole diameter does not correspond to a numbered drill, so the closest millimeter drill should be selected.
The tap drill sizes shown for form taps are only a recommendation as a starting point. Depending on the material being tapped and the depth of the tapped hole, the hole size may have to be slightly increased or decreased to obtain good thread form and good tap life.
MTS
3613 Yucca Lane
Lake Havasu City, AZ 86404
Phone: (928) 505-4420
Fax: (928) 505-4421
E-Mail: MTS@minithread.com
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