Tap drill sizes for UNJF threads
Tap drill sizes for UNJF threads
(OP)
Anybody know where I can get info on this?
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Tap drill sizes for UNJF threads
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RE: Tap drill sizes for UNJF threads
Mark Stapleton
Watermark Design, LLC
Charlotte, NC
www.h2omarkdesign.com
RE: Tap drill sizes for UNJF threads
http://www.tucows.com/preview/356149
RE: Tap drill sizes for UNJF threads
Don't think I've ever seen roll taps successfully used for UNJ threads. Acceptable roll tap life generally requires an increase in finished minor diameter size (less % full thread) than permitted by UNJ thread minor diameter limits. Class 3B thread tolerance requirements and typical "aerospace" materials generally aren't "roll tap friendly" either.
RE: Tap drill sizes for UNJF threads
nr 4 2.4
nr 6 3
nr 8 3.55
nr 10 4.15
1/4 5.55
5/16 7
3/8 8.6
taken from Emuge catalogue