unit of measure
conversions equivalences

italiano misure english measure
Conversion table
Conversion factors in PDF

Whitworth threading

designation diameter kernel (mm) pitch (mm) n° of thread for inch
1/4 4.724 1.270 20
5/16 6.130 1.411  18
3/8 7.491 1.588  16 
7/16 8.788 1.814  14 
1/2 9.988 2.117  12 
5/8 12.917 2.309  11 
3/4 15.798 2.540  10 
7/8 18.611 2.822  9 
1 21.334 3.175  8 
1 1/8 23.927 3.629  7 
1 1/4 27.102 3.629  7 
1 3/8 29.503 4.233  6 
1 1/2 32.678 4.233  6 
1 5/8 34.769 5.080  5 
1 3/4 37.944 5.080  5 
1 7/8 40.397 5.644  4 1/2 
2 43.572 5.644  4 1/2 
2 1/4 49.018 6.350  4 
2 1/2 55.368 6.350  4 
2 5/8 58.543 6.350  4 
2 3/4 60.556 7.257  3 1/2 
3 66.906 7.257  3 1/2 
3 1/4 72.542 7.815  3 1/4 
3 1/2 78.892 7.815  3 1/4 
3 3/4 84.406 8.467  3 
4 90.756 8.467  3 
4 1/4 96.636 8.835  2 7/8 
4 1/2 102.986 8.835  2 7/8 
4 3/4 108.822 9.236  2 3/4 
5 115.172 9.236  2 3/4 
5 1/4 120.958 9.676  2 5/8 
5 1/2 127.308 9.676  2 5/8 
5 3/4 133.038 10.160  2 1/2 
6 139.388 10.160  2 1/2 

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