Inch sized fasteners and more
Table for UNEF- extra fine thread ANSI B1.1
⌀
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
28
–
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
–
41,2750
1,6250
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