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

[Dale Krumheuer]

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



  
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