Thread Roll Blank
Preparation
Machine Diameters, Chamfer Diameters,
Minimum Relief Width & Chamfer angles
| Size |
Machine |
Chamfer |
| Thread |
Dia. |
Dia. |
| |
|
|
| .1120-40 |
.100/.105 |
.072 |
| |
|
|
| .1380-32 |
.122/.127 |
.085 |
| |
|
|
| .1380-40 |
.125/.130 |
.090 |
| |
|
|
| .1640-32 |
.142/.153 |
.112 |
| |
|
|
| .1900-32 |
.172/.177 |
.140 |
| |
|
|
| .2500-20 |
.223/.228 |
.168 |
| |
|
|
| .2500-28 |
.230/.235 |
.187 |
| |
|
|
| .3125-18 |
.280/.285 |
.220 |
| |
|
|
| .3125-24 |
.290/.295 |
.240 |
| |
|
|
| .3750-16 |
.339/.344 |
.272 |
| |
|
|
| .3750-24 |
.352/.357 |
.305 |
| |
|
|
| .4375-20 |
.410/.415 |
.350 |
| |
|
|
| .5000-13 |
.455/.460 |
.375 |
| |
|
|
| .5000-20 |
.470/.475 |
.415 |
| |
|
|
| .5625-18 |
.530/.535 |
.470 |
| |
|
|
| .6250-11 |
.570/.575 |
.480 |
| |
|
|
| .6250-18 |
.592/.597 |
.530 |
| |
|
|
| .7500-10 |
.690/.695 |
.595 |
| |
|
|
| .7500-16 |
.712/.717 |
.645 |
| |
|
|
| .8750-14 |
.831/.836 |
.755 |
| |
|
|
| 1.000-12 |
.950/.955 |
.870 |
| |
|
|
| 1.000-14 |
.958/.963 |
.880 |
| |
|
|
| 1.125-12 |
1.075/1.081 |
.990 |
| |
|
|
| |
|
|
|
|
|
|
Sizes given are adequate for
both UNF & UNJF class 3A & 2A. Blanks will be centerless or cylindrical
ground and thread rolled to you specifications.
Rolled Threads - General information
 |
Thread sizes not
listed: |
A. Machine diameter to be .005/.010" above maximum pitch
diameter to be rolled.
B. Chamfer diameter to be minor diameter less one/half of a
thread pitch.
|
|
Minimum complete
threads or perfect thread length callouts, should be turned one and three
fourths to two thread pitches in length beyond complete thread length
specified.
|
|
|
Material that is
heat-treated above 150,000 KSI before thread rolling has a direct effect
on roll die life. Contact your thread roll source before
proceeding. |
|
|
Acceptable 45
degree chamfers will result from a 30 degree lead angle in most cases.
However, very close tolerance relief and lead angles may have to be
machined after thread roll. |
|
|
To insure
consistent quality therad rolling, turned blank length should be held
within +
.005". |
J.D.OTT COMPANY, INC.
2244 6th Avenue South
Seattle Wa. 98134 Tel. (206)
749-0777