Measure Thread Count & Diameter

 

photo of bolt and rule

 

Measure the diameter by laying the bolt on a rule. Line one edge up with the 1" mark and reading the fraction mark on the other edge.  In the photo the bolt is 3/8".



 

 

 

photo of bolt threads and rule

Line any thread up with the 1" mark then count the number of threads to the 2" mark.  Remember that the thread lined up with 1" mark is zero so the first thread counted is the one immediately to the right of 1".   In this case there are 14 threads per inch.


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