Dash Size Thread Pitch Male Thread O.D.

mm | inch
Female Thread I.D.

mm | inch
12 1.5 12 | .472 10.5 | .473
14 1.5 14 | .551 12.5 | .492
16 1.5 16 | .630 14.5 | .571
18 1.5 18 | .709 16.5 | .650
20 1.5 20 | .787 18.5 | .728
22 1.5 22 | .866 20.5 | .807
24 1.5 24 | .945 22.5 | .886
30 1.5 30 | 1.181 28.5 | 1.122
33 1.5 33 | 1.299 31.5 | 1.240
36 1.5 36 | 1.417 34.5 | 1.358
42 1.5 42 | 1.654 40.5 | 1.594