----- Original Message -----
From: "Tom Note" <tom628@verizon.net>
To: "TR List" <triumphs@autox.team.net>
Sent: Monday, July 07, 2008 10:10 PM
Subject: [TR] brake hub bolts
> Are British fine thread bolts different in thread form or pitch from AN
> or
> SAE bolts?
> I'm replacing the brake rotors on our TR6,and thought I'd replace the old
> original hub bolts with new AN6-24 (3/8-24) aircraft bolts. But they won't
> fit. The bolt will start. and then stop after about 1/2 turn.
> As close as I can tell w/o a thread gage the pitch appears to be the same.
> Both thread into a 3/8-24 nut, though the Brit bolt appears to fit just
> slightly looser.
> So, the AN bolt won't work, yet if I try an SAE grade 8 bolt of the same
> size it works fine, just like the Brit bolt. (Shoulder-to-thd. ratio is
> not
> right tho.)
> Just wondered if others have come across this, and what the reason for it
> is.
>
> Thanks,
> Tom
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