Thread Roll Blank Preparation
Machine Diameters, Chamber Diameters, Minimum Relief Width & Chamber angles
|
Size |
Machine |
Chamber |
|
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. Chamber 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 chambers 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