jussi Posted March 21, 2021 Report Share Posted March 21, 2021 I need to re tread a bolt on my jointer fence. It's a 1/2" - 14. I went and bought a set at harbor freight which had the requisite die size but when I got it home it's way too large. I must be missing something on how they designate sizing. Below is a pic of the nut and the die side by side. I want to order the correct one but am worried I'll get the wrong size again. Quote Link to comment Share on other sites More sharing options...
rainjer Posted March 21, 2021 Report Share Posted March 21, 2021 The 1/2-14 would be the tread size. The 1/2" would be the outside diameter of the threads and the 14 is the pitch = 14 threads per inch. How do you determine that is was the thread you needed? Quote Link to comment Share on other sites More sharing options...
jussi Posted March 21, 2021 Author Report Share Posted March 21, 2021 Because the nut does partially go in the bolt. About an inch in however it gets stuck. Plus I actually counted the treads. Quote Link to comment Share on other sites More sharing options...
jussi Posted March 21, 2021 Author Report Share Posted March 21, 2021 Quote Link to comment Share on other sites More sharing options...
Chestnut Posted March 21, 2021 Report Share Posted March 21, 2021 NPT stands for national pipe threads. Pipe threads are different than bolt threads. 1/2" refers to the inside pipe diameter and the outside is close to .9" I believe what you are looking for is 1/2"-13 NC or 7/16"-14 NC. 2 Quote Link to comment Share on other sites More sharing options...
rainjer Posted March 21, 2021 Report Share Posted March 21, 2021 34 minutes ago, jussi said: Because the nut does partially go in the bolt. About an inch in however it gets stuck. Plus I actually counted the treads. Are you sure you don't need metric bolts/nuts? 1 Quote Link to comment Share on other sites More sharing options...
Tom King Posted March 22, 2021 Report Share Posted March 22, 2021 Pipe threads are tapered along the length. I'd expect it to be 1/2-13. Here's a coarse (regular), and fine thread chart. https://www.atlrod.com/standard-thread-pitch-chart-nuts-bolts/ Quote Link to comment Share on other sites More sharing options...
Coop Posted March 22, 2021 Report Share Posted March 22, 2021 To be sure, take the nut to HD or Lowe’s and they have a bolt sample chart that you can screw it onto. Yep, what you have is a 1/2” pipe die as others have said. Quote Link to comment Share on other sites More sharing options...
jussi Posted March 22, 2021 Author Report Share Posted March 22, 2021 Thanks for the replies guys. You’re I didn’t realize there was a difference between pipe and nut / bolt treads. And rainjer might be right that it is metric treads. Quote Link to comment Share on other sites More sharing options...
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