There is a slight difference between UNF threads and SAE fine
threads and your 1/2" - 20 tap has now change the threads to SAE fine. The
UNF bolt will now feel loose in those threads. Since you changed to an
SAE bolt, there is no problem as long as you stay with the SAE bolt.
I do not have a set of UNF tap and die so I use UNF bolts as taps.
I just use a Dremel tool to cut flutes down the length of the bolt threads
and then run that bolt through to clean the threads. You really should use
UNF bolts in the cleaned threads, but I have also used the UNF bolt tap to
clean the threads and then used SAE bolts.
Ron Fraser
-----Original Message-----
From: lgooch@satx.rr.com [mailto:lgooch@satx.rr.com]
Sent: Monday, June 13, 2005 9:34 PM
To: rfraser@bluefrog.biz; trippel@peoplepc.com; tigers@autox.team.net
Subject: RE: Front crossmember
I took my old front crossmember bolts to the bolt and screw company. They
did not have the exact length so I got them about 1/8 longer rather than
shorter. I did get grade 8. Just got through running them through a 1/2'
NF20 die (or is that a tap) to clean up the new threads, there was some
resistance but came out looking cleaner and seem to start into the holes
better. I guess the question is: does this sounds like a normal process or
are the new bolts suppose to go right in with hand tightening.
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