[Cl...] Posted October 23, 2024 Share Posted October 23, 2024 I'm hoping someone here has experience measuring screw threads. I'm using the O-inspect camera to measure the Major/Minor diameters. Pitch/Pitch diameter, lead angle. I just can't find the tolerances for these dimensions. I have the nominals, but don't have the tolerances They are not on the print. My engineer doesn't have them, and I haven't been able to find them online either. Any help would be greatly appreciated. 1/4 - 32 UNEF-2A Link to comment Share on other sites More sharing options...
[Da...] Posted October 23, 2024 Share Posted October 23, 2024 https://torqbolt.com/unef-unified-natio ... ifications I found some information at this site, but it won't let me copy it to share. Hope this helps. Link to comment Share on other sites More sharing options...
[To...] Posted October 23, 2024 Share Posted October 23, 2024 Please sign in to view this quote. Courtesy Machinery's Handbook Screw Thread Systems Table 4 In the time it took for me to take pictures and upload, Mr. Fitzgerald snuck in for the gold. (in metric....LOL)Screenshot 2024-10-23 131615.jpg Link to comment Share on other sites More sharing options...
[Cl...] Posted October 23, 2024 Author Share Posted October 23, 2024 Thanks guys! I couldn't find anything like this? Link to comment Share on other sites More sharing options...
[Je...] Posted October 23, 2024 Share Posted October 23, 2024 You should be able to find nearly all thread standards/tolerances within the Machinerys Handbook. Link to comment Share on other sites More sharing options...
[Cl...] Posted October 23, 2024 Author Share Posted October 23, 2024 After searching for over an hour I finally found what I needed at Theoreticalmachinist.com. Link to comment Share on other sites More sharing options...
[To...] Posted October 23, 2024 Share Posted October 23, 2024 Please sign in to view this quote. spelling?Screenshot 2024-10-23 153617.jpg Link to comment Share on other sites More sharing options...
[Cl...] Posted October 23, 2024 Author Share Posted October 23, 2024 Yep. Typing too fast. Link to comment Share on other sites More sharing options...
[Wo...] Posted October 23, 2024 Share Posted October 23, 2024 I always use theoretical machinist website for imperial threads http://theoreticalmachinist.com/Threads ... erial.aspx It shows the thread wire size applicable to given pitch, which is nice because I immediately know if I have a stylus size within that range. Edit: Whoops, did not notice you've already found it. Link to comment Share on other sites More sharing options...
[DW...] Posted October 24, 2024 Share Posted October 24, 2024 I believe thread standards are covered in the ANSI/ASME B1.XX series. PDF downloads are available for all of them with an easy google search. Link to comment Share on other sites More sharing options...
[Ch...] Posted October 24, 2024 Share Posted October 24, 2024 I thought everyone and their dog used engineersedge.com https://www.engineersedge.com/hardware/ ... sizes1.htm Link to comment Share on other sites More sharing options...
[To...] Posted October 24, 2024 Share Posted October 24, 2024 Please sign in to view this quote. You could have at least posted the Inch link....LOL Link to comment Share on other sites More sharing options...
[Ow...] Posted October 25, 2024 Share Posted October 25, 2024 I'll concur, the Machinist Handbook is priceless. However, the PDF copy I have at work (a few years old) is cumbersome, to say the least, to search for anything. Does anybody else have this problem or is there an on-line version that can be accessed with a paid subscription that would be easier? At home, I have the 15th edition book made in 1956, it's 3" thick but, I still use it occasionally. A few other web pages for threads. https://amesweb.info/Screws/metric-thre ... lator.aspx https://www.machiningdoctor.com/threadinfo/?tid=83 Link to comment Share on other sites More sharing options...
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