Inch sized fasteners and more
Table for UNC- coarse thread ANSI B1.1
⌀
Threads per Inch
pilot holeØ mm
Millimeter
Inch Decimal
Nr. 00
90
–
1,1938
0,0470
Nr. 1
64
1,55
1,8542
0,0730
Nr. 2
56
1,85
2,1844
0,0860
Nr. 3
48
2,10
2,5146
0,0990
Nr. 4
40
2,35
2,8448
0,1120
Nr. 5
40
2,65
3,1750
0,1250
Nr. 6
32
2,85
3,5052
0,1380
Nr. 8
32
3,45
4,1656
0,1640
Nr. 10
24
3,90
4,7625
0,1875
Nr. 12
24
4,50
5,4864
0,3125
1/4
20
5,20
6,3500
0,3750
5/16
18
6,60
7,9375
0,3125
3/8
16
8,00
9,5250
0,3750
7/16
14
9,40
11,1125
0,4375
1/2
13
10,75
12,7000
0,5000
9/16
12
12,25
14,2875
0,5625
5/8
11
13,50
15,8750
0,6250
11/16
11
–
17,4625
0,6875
3/4
10
16,50
19,0500
0,7500
13/16
10
–
20,6375
0,8125
7/8
9
19,50
22,2250
0,8750
15/16
9
–
23,8125
0,9375
1
8
22,25
25,4000
1,0000
1.1/8
7
25,00
28,5750
1,1250
1.1/4
7
28,25
31,7500
1,2500
1.3/8
6
30,75
34,9250
1,3750
1.1/2
6
34,00
38,1000
1,5000
1.5/8
5
–
41,2750
1,6250
1.3/4
5
39,50
44,4500
1,7500
1.7/8
4.1/2
–
47,6250
1,8750
2
4.1/2
45,25
50,8000
2,0000
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