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snowrunner51
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Join Date: Feb 2009
Posts: 2

Roll Form Threads

03/26/2009 10:03 AM

Hi guys

Can a whizz on this site plz tell me the correct inspection pins for a 1/4 28 roll form thread g8 pre plate in steel. We are having quite a time trying to find this spec for tolorance on minor dia.

Also can someone plz inform me as to the difference between a b8 and g8 tap.

Thanks a lot

Kevin
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Jim C
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Popular Science - Weaponology - New Member United States - Member - New Member Engineering Fields - Manufacturing Engineering - New Member

Join Date: Sep 2006
Location: Philly burbs USA
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Good Answers: 2
#1

Re: Roll Form Threads

03/27/2009 6:27 AM

1/4-28 UNF 2B tolerances are the same no matter the method you use, Roll taps or cut taps. I know that Roll taps require a closer tolerance in the minor dia.(tap drill isize) for them to work properly. but the end product should be the same in size (Ø.215) Jim C

http://www.balax.com/
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easleydoesit
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Join Date: Mar 2009
Posts: 2
#2

Re: Roll Form Threads

04/28/2009 5:20 PM

a G8 thread has a wider allowable tolerance band.
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