Thread Roll Blank Preparation
Machine Diameters, Chamfer Diameters, Minimum Relief Width & Chamfer angles
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