E
exithere
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 a moderator:
E
exithere
Re: SAE-AS8879 Threaded Hole Gaging - A 7/16-20UNF-3B
.4375UNF-3B versus .4375-UNJF-3B. Sorry, still looking for first coffee
.4375UNF-3B versus .4375-UNJF-3B. Sorry, still looking for first coffee
E
exithere
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.
A
aduck
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?
J
JAltmann
No, you need the UNJF model gage. They are truncated slightly different to check the clearance of the controlled root radius.
J
JAltmann
I usually purchase from Thread Tech, Inc. www.threadcheck.com Make sure you specify the "J" version.
I am not affliated with them.
A
aduck
A
aduck
Our source that does some of our calibration, told us to be careful who we buy the gages off of. He has had to reject brand new gages. How are the gages you bought from Thread Tech? Our source is not familar with them.