Inch sized fasteners and more
Table for BSF Whitworth fine thread BS 84
⌀
Threads per Inch
pilot holeØ mm
Millimeter
Inch Decimal
3/16
32
3,90
4,7625
0,1875
7/32
28
4,70
5,5563
0,2188
1/4
26
5,40
6,3500
0,2500
9/32
26
–
7,1438
0,2813
5/16
22
6,80
7,9375
0,3125
3/8
20
8,30
9,5250
0,3750
7/16
18
7,70
11,1125
0,4375
1/2
16
11,10
12,7000
0,5000
9/16
16
12,70
14,2875
0,5625
5/8
14
14,10
15,8750
0,6250
11/16
14
15,70
17,4625
0,6875
3/4
12
17,00
19,0500
0,7500
13/16
12
–
20,6375
0,8125
7/8
11
13,50
22,2250
0,8750
15/16
11
–
23,8125
0,9375
1
10
23,00
25,4000
1,0000
1.1/8
9
26,00
28,5750
1,1250
1.1/4
9
29,00
31,7500
1,2500
1.3/8
8
32,00
34,9250
1,3750
1.1/2
8
35,00
38,1000
1,5000
1.5/8
8
38,00
41,2750
1,6250
1.3/4
7
41,00
44,4500
1,7500
1.7/8
7
–
47,6250
1,8750
2
7
47,00
50,8000
2,0000
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