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Stock Diameters for Even Knurls

Knurls have a definite pitch, and they work best when the stock diameter is an approximate multiple of that pitch. Here is a calculator and an easy formula to find the next smaller diameter from the diameter of your work piece. The most material you ever have to remove is 0.023" for a 14-pitch knurl.

Calculator

Original Diameter Knurl Pitch Knurling Diameter
 

Calculation

Step Action Example
1 Multiply the current diameter (in inches) by the pitch factor shown below. 0.75" × 103.67 = 77.7525
2 Drop the decimals. 77
3 Divide by the pitch factor shown below. 77 ÷ 103.67 = 0.7427
4 Turn the blank down to the diameter found 0.743"

Pitch Factors

33 LPI Knurls

103.67
22 LPI Knurls

69.12
14 LPI Knurls

43.98

Spreadsheet

If you have Excel, here is a little spreadsheet that will calculate it all for you:

The formula in cell C4 is =ROUND(INT(A4*B4*PI())/B4/PI(),3)

 
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