Thread Tolerance for Flank Angle & Root Radius

[JimBongard]

Any idea where I can find the limits for the 60? Angle and Root Radius on a .4375-20 UNF-3A thread? I've searched the Handbook with no luck.

Thanks for any help in advance.

[JimBongard]

Any idea where I can find the limits for the 60? Angle and Root Radius on a .4375-20 UNF-3A thread? I've searched the Handbook with no luck.

Thanks for any help in advance.

[Drew Price]

http://lh6.ggpht.com/drewpprice/SNQbaZVM84I/AAAAAAAAAU8/tT88kM0SOi0/s800/Threads%20-%20Smith%20004.jpg

Courtesy of a printing in Smith's 'Nuts, Bolts, & Fasteners.'

Best,
Drew

[JimBongard]

Drew,

Thank you for your reply. Perhaps I am not seeing the obvious. I am interested in the actual tolerance for the flank angle i.e. 60?±X? and the same for the root radius.

Is the interpretation that these features exist within the profile of the spec?

If yes, then this become a pretty complicated tolerancing scheme.

[Brian Evans]

I just checked in Machinery's and it doesn't have tolerances for the specifications either. Looking at a mil spec catalog the call-out for thread is MIL-S-7742, which was replaced with SAE AS8879. A little googling didn't come up with a copy of that, but you can buy that spec document from SAE.

[billywight]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">the call-out for thread is MIL-S-7742, which was replaced with SAE AS8879. A little googling didn't come up with a copy of that, but you can buy that spec document from SAE. </div></BLOCKQUOTE>

Here's the Mil-Spec:

http://assist.daps.dla.mil/docimages/A/0000/0000/6581/0...06305770d12737791224 (http://assist.daps.dla.mil/docimages/A/0000/0000/6581/000000019144_000000011730_YTVZRXWRPJ.PDF?CFID=1468 2989&CFTOKEN=de6ff90b7a3d8914-8B6ECE21-1372-548A-D37C44AAB43917A7&jsessionid=06305770d12737791224)

Assist is awesome for looking up mil specs for free...

[gregm]

Thanks to the member who provided a link to MIL-S-7742D. Paying for public property irks me no end since we all have already paid for the creation of same via the government agencies that create them. How can selling them be legal?