UNEF- extra fine thread ANSI B1.1

Ø Threads per Inch pilot holeØ mm Millimeter Inch
Decimal
Nr. 12 32   5,4864 0,2160
1/4 32   6,3500 0,2500
5/16 32   7,9375 0,3125
3/8 32   9,5250 0,3750
7/16 28   11,1125 0,4375
1/2 28   12,7000 0,5000
9/16 24   14,2875 0,5625
5/8 24   15,8750 0,6250
11/16 24   17,4625 0,6875
3/4 20   19,0500 0,7500
13/16 20   20,6375 0,8125
7/8 20   22,2250 0,8750
15/16 20   23,8125 0,9375
1 20   25,4000 1,0000
1.1/8 18   28,5750 1,1250
1.1/4 18   31,7500 1,2500
1.3/8 18   34,9250 1,3750
1.1/2 18   38,1000 1,5000
1.5/8 18   41,2750 1,6250