I don't understand your statement that SAE threads are different from
UNF.
Reading through my SAE handbook it specifically calls out the use of UNF
threads on SAE fasteners.
On Tue, 14 Jun 2005 00:28:28 -0400 " Ron Fraser" <rfraser@bluefrog.biz>
writes:
> 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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