[Land-speed] Not LSR Question, Need to cut threads to make a 3/8 bolt

[Rich Fox]

Yeah that's what it says in the Machinist's Practical Guide. But pull a head 
bolt from a Small block Ford and see if it's really .4375. The one I tried 
wasn't Chrysler rod bolt--.373. Life is sometimes that way. Roller formed 
bolts are rarely at full size in my experience. As long as the pitch 
diameter is correct a few thou. on the OD isn't something to get excited 
about.
----- Original Message ----- 
From: "don thigpen" <piggy at accessatc.net>
To: <neil at dbelltech.com>; "'Rich Fox'" <v4gr at rcn.com>; "'Dale Krumheuer'" 
<dmirror3 at yahoo.com>; <land-speed at autox.team.net>
Sent: Monday, June 18, 2007 8:20 PM
Subject: Re: [Land-speed] Not LSR Question, Need to cut threads to make a 
3/8 bolt


>a 3/8 bolt thread does have a major diameter of .375 , unless of course you 
>have a very low class of fit and even then it is speced at .375 and the nut 
>is speced accordingly . please dont put a bolt in my vehicle that is 
>undersized as it will not hold its threads , if it is a 3/8 bolt make it 
>3/8 , if 1/4 make it 1/4 ,etc . KEEP CHEAP UNDERSIZED FASTENERS ON 
>LAWNMOWERS
> if  i had my other puter up i could send you a real nice chart with fits 
> and major and minor dia's of bolts and nuts but the other puter is broken
>
> don t
> evo power & machine