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

[neil at dbelltech.com]

Rich;

I think you've pointed out one of the problems; a 3/8-16 bolt thread is not
0.375" major diameter. That would be 100% thread and that would be next to
impossible to mate with a nut at maximum spec thread. Most threaded joints
are somewhat less than 100%-- most thread guides give you a drill size for
tapping a particular thread size and different size drills give you a
different % of thread. Same for threading a rod, the diameter of the rod
determines the % of thread. A taper will definitely help get the die started
but make sure it starts straight!

Regards, Neil  Tucson, AZ

-----Original Message-----
From: land-speed-bounces at autox.team.net
[mailto:land-speed-bounces at autox.team.net] On Behalf Of Rich Fox
Sent: Monday, June 18, 2007 3:28 PM
To: Dale Krumheuer; land-speed at autox.team.net
Subject: Re: [Land-speed] Not LSR Question, Need to cut threads to make a
3/8 bolt

Without grabing my Machinery handbook I can say that the major diameter of a

3/8-16 bolt is about .370. Very close to 3/8. Not sure what is going on..
----- Original Message ----- 
From: "Dale Krumheuer" <dmirror3 at yahoo.com>
To: <land-speed at autox.team.net>
Sent: Monday, June 18, 2007 1:25 PM
Subject: [Land-speed] Not LSR Question,Need to cut threads to make a 3/8 
bolt


> This sounds so eay yet I don't want to buy the wrong size steel rod stock 
> (again). I need to cut thread to fit 3/8" 16. I blundered and bought 3/8 
> inch stock yet its obviously too large for my die. What size stock should 
> I use ?
> Feeling quite humble,
> Dale Krumheuer