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BSW Threads Per Inch Table

21/02/2024
Omrook Admin
SIZE TPI EXTERNAL DRILL SIZE DRILL SIZE
BSW      CLEARANCE HOLE TAPPED HOLE
    INCH MM INCH MM INCH MM
1/16 60 0.0620 1.59   1.99  
1.15
3/32 48 0.0940 2.38   2.67  
1.90
1/8 40 0.1250 3.18 9/64 3.57 # 38
2.60
5/32 32 0.1560 3.97 11/64 4.37 1/8
3.20
3/16 24 0.1870 4.75 13/64 5.16 # 27
3.70
7/32 24 0.2190 5.60 15/64 5.95 # 19
4.30
1/4 20 0.2500 6.35 17/64 6.75 # 9
5.00
5/16 18 0.3120 7.92 21/64 8.33 1/4
6.40
3/8 16 0.3750 9.53 25/64 9.92 5/16
8.00
7/16 14 0.4370 11.10 29/64 11.51 U
9.40
1/2 12 0.5000 12.70 17/32 13.49 27/64
10.80
9/16 12 0.5630 14.29 19/32 15.08 15/32
12.00
5/8 11 0.6250 15.88 21/32 16.67 17/32
13.50
11/16 11 0.6880 17.48   17.75  
15.00
3/4 10 0.7500 19.05 25/32 19.84 21/32
17.00
13/16 10 0.8130 20.65   21.00  
18.00
7/8 9 0.8750 22.23 29/32 23.02 49/64
19.50
15/16 9 0.9380 23.83   24.00  
20.75
1 8 1.0000 25.40 1 1/16 26.99 7/8
22.50
1 1/8 7 1.1250 28.58 1 3/16 30.16 1
25.50
1 1/4 7 1.2500 31.75 1 5/16 33.34 1 7/16
28.50
1 3/8 6 1.3750 34.93 1 7/16 36.51 1 7/32
31.00
1 1/2 6 1.5000 38.10 1 9/16 39.69 1 11/32
34.50
1 5/8 5 1.6250 41.28   41.50  
35.50
1 3/4 5 1.7500 44.45   45.00  
38.50
1 7/8 4.5 1.8750 47.63   48.00  
41.25
2 4.5 2.0000 50.80   51.00  
44.50
2 1/4 4          
50.00

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