I would suggest you put a slight point on the bolt to get by the bad
threads; a thread file might work OK here too. As Theo states the threads
for UNF are slightly different from SAE threads. If you have another same
bolt available I would cut grooves in the length of the bolt threads to make
it a thread chaser to clean the threads in the frame. If you have just the
one bolt then be less aggressive and shorter with the grooves and run the
bolt in a out a few times cleaning the grooves each time until clean.
Ron Fraser
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Smit, Theo
Sent: Tuesday, July 13, 2010 10:48 AM
To: Would U. Believe
Cc: tigers@autox.team.net
Subject: Re: [Tigers] Crossmember Installation Headache: Advice Needed
Please!
Those bolts are not easily found because of their length and the grip length
(the amount of the bolt that is threaded). Also, they're British fine thread
which is almost but not quite the same as SAE: the threads are angled at 55
degrees and the roots and tips of the threads are rounded rather than sharp.
So your (SAE) die will change the thread shape somewhat - the less that you
thread on those bolts with the die, the better.
Good luck,
Theo
________________________________________
From: Would U. Believe [mcdangerous@verizon.net]
Sent: Monday, July 12, 2010 7:05 PM
To: Smit, Theo
Subject: Re: [Tigers] Crossmember Installation Headache: Advice Needed
Please!
Well, as it turns out, in a short time after work, with fresh eyes and a
fresh mind, I was able to get the third bolt in and the fourth hole is lined
up. Unfortunately, I flattened the beginning threads of the fourth bolt
yesterday and will have to use a die to freshen them (or find another bolt.
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