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5/8-24 UNJEF bottoming tap or ID thread tool

robert123

Stainless
Joined
Apr 8, 2012
Location
AR, USA
I need a tap this size. Does it exist or is it custom? I see quite a few 5/8-24 but no J thread. Or an ID threading tool on a lathe could work.
 

SeymourDumore

Diamond
Joined
Aug 2, 2005
Location
CT
As mentioned, for internal J threads the only variation from the standard is the minor diameter, which is larger to accommodate the root radius on the male thread.
As a result, there is no such thing as a UNJ tap.
Bore the minor to the spec ( for a .6250-24 UNJEF it is .5904-.5844 ) and tap with whatever will get you the depth.
 








 
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