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SAE-AS8879 Threaded Hole Gaging - .4375UNF-3B and .4375-UNJF-3B


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Some Related Topic Tags (Not all threads are Tagged)
holes in parts - depth and diameter, sae (society of automotive engineers), sae as8879 - screw thread unj profiles, threads (of fasteners such as nuts and bolts)
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  Post Number #1  
Old 30th December 2011, 07:18 AM
exithere

 
 
Total Posts: 10
Please Help! SAE-AS8879 Threaded Hole Gaging - .4375UNF-3B and .4375-UNJF-3B

Question on thread gaging. Can a .4375UNF-3B and a .4375-UNJF-3B be used to check a hole threaded to AS8879??

Last edited by Marc; 30th December 2011 at 08:05 AM. Reason: Fixed the UNF and UNJF.

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  Post Number #2  
Old 30th December 2011, 07:36 AM
exithere

 
 
Total Posts: 10
Re: SAE-AS8879 Threaded Hole Gaging - A 7/16-20UNF-3B

.4375UNF-3B versus .4375-UNJF-3B. Sorry, still looking for first coffee
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  Post Number #3  
Old 30th December 2011, 08:14 AM
exithere

 
 
Total Posts: 10
Re: SAE-AS8879 Threaded Hole Gaging - .4375UNF-3B and .4375-UNJF-3B

The best I am able to recall/interpret is that threading to AS8879, the major difference is to external threads with the modified root radius. With internal threads, as long as there is not a modification to the call out on the print, the acceptance characteristics of a .4375-20UNF-3B and a .4375-20UNJF-3B plug gage are the same. Am looking for confirmation I hope.
  Post Number #4  
Old 30th December 2011, 08:25 AM
Stijloor's Avatar
Stijloor

 
 
Total Posts: 15,197
Re: SAE-AS8879 Threaded Hole Gaging - .4375UNF-3B and .4375-UNJF-3B

Quote:
In Reply to Parent Post by exithere View Post

The best I am able to recall/interpret is that threading to AS8879, the major difference is to external threads with the modified root radius. With internal threads, as long as there is not a modification to the call out on the print, the acceptance characteristics of a .4375-20UNF-3B and a .4375-20UNJF-3B plug gage are the same. Am looking for confirmation I hope.
A few of our Members are thread gaging experts. Because of the Holidays, a response may be delayed. Be patient with us.

Stijloor.
  Post Number #5  
Old 26th January 2012, 09:52 AM
aduck

 
 
Total Posts: 3
Please Help! Re: SAE-AS8879 Threaded Hole Gaging - .4375UNF-3B and .4375-UNJF-3B

hi, wanted to see if you ever found the answer to the question? we have call out of .375-24 UNJF-3B with AS8879. Was wondering the same thing you were?
  Post Number #6  
Old 26th January 2012, 10:19 AM
JAltmann's Avatar
JAltmann

 
 
Total Posts: 169
Re: SAE-AS8879 Threaded Hole Gaging - .4375UNF-3B and .4375-UNJF-3B

No, you need the UNJF model gage. They are truncated slightly different to check the clearance of the controlled root radius.
Thank You to JAltmann for your informative Post and/or Attachment!
  Post Number #7  
Old 26th January 2012, 10:25 AM
Stijloor's Avatar
Stijloor

 
 
Total Posts: 15,197
Re: SAE-AS8879 Threaded Hole Gaging - .4375UNF-3B and .4375-UNJF-3B

Quote:
In Reply to Parent Post by JAltmann View Post

No, you need the UNJF model gage. They are truncated slightly different to check the clearance of the controlled root radius.
James,

Do you have a source where such a gage can be purchased?

Thank you!

Stijloor.
  Post Number #8  
Old 26th January 2012, 10:41 AM
JAltmann's Avatar
JAltmann

 
 
Total Posts: 169
Re: SAE-AS8879 Threaded Hole Gaging - .4375UNF-3B and .4375-UNJF-3B

Quote:
In Reply to Parent Post by Stijloor View Post

James,

Do you have a source where such a gage can be purchased?

Thank you!

Stijloor.
I usually purchase from Thread Tech, Inc. www.threadcheck.com Make sure you specify the "J" version.

I am not affliated with them.
Thanks to JAltmann for your informative Post and/or Attachment!
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