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View Full Version : Maximum minor thread diameter of UNF internal threads qcman 20th January 2007, 10:29 AM Can someone confirm for me the following max/min minor diameter of UNF internal threads? 1/4-28 1B = 0.220 max 0.211 min 1/4-28 2B = 0.220 max 0.211 min 1/4-28 3B = 0.219 max 0.211 min 10-32 2B = 0.164 max 0.156 min 10-32 3B = 0.1641 max 0.156 min Marc 25th January 2007, 09:15 AM Can anyone help with this question? AndyN 25th January 2007, 09:49 AM Yeah, if I can find my Machinery's Handbook! Andy Marc 25th January 2007, 09:58 AM Any help will be appreciated! Thanks, Andy! walking eagle 25th January 2007, 09:59 AM Those numbers are correct sir. AndyN 25th January 2007, 10:03 AM Found it (19th edition) - and those values are spot on! Andy John Nabors 24th February 2007, 01:10 PM qcman- May I suggest ordering a copy of ASME B1.1-2003? It contains all of the dimensional data for Unified screw threads. You can buy it online here: http://catalog.asme.org/Codes/PrintBook/B11_2003_Unified_Inch_Screw.cfm or by phone at 1-800-THE-ASME. I'm a firm believer in owning national standards. They tend to bring debates to a quick halt (although not always!!). Regards -John qcman 26th February 2007, 10:04 AM Thank you all :applause: |
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