Buck
UNF is the Unified bolt series that the US and Great Britain put
together during WW II so they would be compatible. There is a slight angle
of the thread difference between them. The British Whitworth thread
series is the odd ball to us in the states.
The stock 1/2 UNF bolt has 20 threads per inch and the length of the
threaded part is 1 5/8". Any replacement bolt has to have the same thread
number and thread length equal to or more than the original bolt.
I don't recall anyone damaging the lower threads but it is very
possible. I would more suspect damage at the upper threads because the top
of the threaded tube is exposed to the elements and generally has rust
there.
Ron Fraser
-----Original Message-----
From: CLAUDIA TRIPPEL [mailto:TRIPPEL@peoplepc.com]
Sent: Monday, June 13, 2005 11:44 AM
To: Ron Fraser
Subject: Re: Front crossmember
Ron,
Don't those bolts have a weird thread ratio? i.e Don't they require
more threaded length than you'd get if you bought an off the shelf 3-1/4"
bolt. I seem to remember that if you used an off the shelf bolt the
unthreaded part of the bolt would hit the lower threads before the head of
bolt was close to contact. Most don't realize what's happening and force
the bolt in further damaging the lower threads. Anyway that's a fuzzy
recolletion.
Buck Trippel
----- Original Message -----
From: " Ron Fraser" <rfraser@bluefrog.biz>
To: <65Tiger@comcast.net>; "'PHILLIP SILK'" <musta32188@msn.com>;
<tigers@autox.team.net>
Sent: Monday, June 13, 2005 7:15 AM
Subject: RE: Front crossmember
> The parts manual list the bolts as 1/2 UNF x 3 1/4 - quantity 4
>
> Ron Fraser
>
> -----Original Message-----
> From: owner-tigers@autox.team.net [mailto:owner-tigers@autox.team.net]
> On Behalf Of 65Tiger@comcast.net
> Sent: Monday, June 13, 2005 1:32 AM
> To: PHILLIP SILK; tigers@autox.team.net
> Subject: Re: Front crossmember
>
>
> Phillip,
> The cross member is bolted to the frame through tube nuts which are
> welded to the frame. There is a tech tip on how to reinforce the tube
> nuts to
the
> frame. Per my measurements there is 1 5/8 inches from the (bottom of
> the) frame to the tube nut on the forward spot and 1 7/8 inches from
> the frame
to
> the tube nut on the back spot. Hence, you would use the longer bolt
> on
the
> back. I also replaced my original bolts with Grade 8 bolts of the
> same length. Be sure to check out that tech tip!
>
> Curtis
>
> -------------- Original message --------------
>
> > And another question...
> >
> > I have noticed that the bolts attaching my front
> > crossmember/subframe appear to be different lengths (as it appears
> > still attached). Is that normal,
or
>
> > did the previous owner possibly put it together with what was lying
> around?
> >
> > Thanks.
> >
> > Phillip
>
>
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