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On Orders Over £99.99 to UK Mainland

Metric Coarse Thread Forms and Pitch
Thread Angle 60o

Metric Thread Diameter Coarse Pitch (mm) Tap Drill Diameter (mm)
M1.6 0.35 1.25
M2 0.40 1.60
M2.5 0.50 2.05
M3 0.50 2.50
M4 0.70 3.30
M5 0.80 4.20
M6 1.00 5.00
M7 1.00 6.00
M8 1.25 6.80
M10 1.50 8.50
M12 1.75 10.20
M14 2.00 12.00
M16 2.00 14.00
M18 2.50 15.50
M20 2.50 17.50
M22 2.50 19.50
M24 3.00 21.00
M27 3.00 24.00
M30 3.50 26.50
M33 3.50 29.50
M36 4.00 32.00
M39 4.00 35.00
M42 4.50 37.50

Metric Fine Thread Forms and Pitch
Thread Angle 60o
 
Metric Thread Diameter Fine Pitch (mm) Tap Drill Diameter (mm)
M1.6 0.20 1.40
M2 0.25 1.75
M2.5 0.35 2.10
M3 0.35 2.60
M4 0.50 3.50
M5 0.50 4.50
M6 0.75 5.20
M7 0.75 6.20
M8 0.75 7.20
M8 1.00 7.00
M10 0.75 9.20
M10 1.00 9.90
M10 1.25 8.80
M12 1.00 11.00
M12 1.25 10.80
M12 1.50 10.50
M14 1.00 13.00
M14 1.25 12.80
M14 1.50 12.50
M16 1.0 15.00
M16 1.50 14.50
M18 1.0, 1.50, 2.00 17.00, 16.50, 16.00
M20 1.00 19.00
M20 1.50 18.50
M20 2.00 18.00

BSW Coarse Thread Forms and Pitch
Thread Angle 55o
 
BSW Thread Diameter (inches) Threads Per Inch Tap Drill Diameter (mm)
1/8" 40 2.50
3/16" 24 3.70
1/4" 20 5.10
5/16" 18 6.50
3/8" 16 7.90
7/16" 14 9.20
1/2" 12 10.40
9/16" 12 11.89
5/8" 11 13.40
3/4" 10 16.25
1" 8 22.00
1 1/4" 7 27.25
1 1/2" 6 33.50
1 3/4" 5 38.50
2" 4 1/2 44.50

BSF Fine Thread Forms and Pitch
Thread Angle 55o
 
BSF Thread Diameter (inches) Threads Per Inch Tap Drill Diameter (mm)
3/16" 32 4.00
1/4" 26 5.30
5/16" 22 6.80
3/8" 20 8.30
7/16" 18 9.70
1/2" 16 11.10
9/16" 16 12.70
5/8" 14 14.00
3/4" 12 16.75
1" 10 22.75
1 1/4" 9 28.75
1 1/2" 8 34.50
1 3/4" 7 40.50
2" 7 47.00

UNC Coarse Thread Forms and Pitch
Thread Angle 60o
 
UNC Thread Diameter (inches) Threads Per Inch Tap Drill Diameter (mm)
1 - 64 64 1.50
2 - 56 56 1.80
3 - 48 48 2.10
4 - 40 40 2.35
5 - 40 40 2.65
6 - 32 32 2.85
8 - 32 32 3.50
10 - 24 24 4.00
12 - 24 24 4.65
1/4" - 20 20 5.35
5/16" - 18 18 6.80
3/8" - 16 16 8.25
7/16" - 14 14 9.65
1/2" - 13 13 11.15
9/16" - 12 12 12.60
5/8" - 11 11 14.05
3/4" - 10 10 17.00
7/8" - 9 9 20.00
1" - 8 8 22.85
1 1/4" - 7 7 28.85
1 1/2" - 6 6 34.70
1 3/4" - 5 5 40.40
2" - 4 1/2 4.5 46.30

UNF Fine Thread Forms and Pitch
Thread Angle 60o
 
UNF Thread Diameter (inches) Threads Per Inch Tap Drill Diameter (mm)
0 - 80 80 1.25
1 - 72 72 1.55
2 - 64 64 1.90
3 - 56 56 2.15
4 - 48 48 2.40
5 - 44 44 2.70
6 - 40 40 2.95
8 - 36 36 3.50
10 - 32 32 4.10
12 - 28 28 4.70
1/4" - 28 28 5.50
5/16" - 24 24 6.90
3/8" - 24 24 8.50
7/16" - 20 20 9.90
1/2" - 20 20 11.50
9/16" - 18 18 12.90
5/8" - 18 18 14.50
3/4" - 16 16 17.50
7/8" - 14 14 20.40
1" - 12 12 23.25
1 1/4" - 12 12 29.50
1 1/2" - 12 12 36.00

BA Thread Forms and Pitch
Thread Angle 47.5o
 
BA Thread Diameter Threads Per Inch Tap Drill Diameter (mm)
16BA 134.0 0.60
15BA 121.0 0.70
14BA 110.0 0.80
13BA 102.0 0.98
12BA 90.7 1.05
11BA 82.0 1.20
10BA 72.6 1.40
9BA 65.1 1.55
8BA 59.1 1.80
7BA 52.9 2.05
6BA 47.9 2.30
5BA 43.0 2.65
4BA 38.5 3.00
3BA 34.8 3.40
2BA 31.4 4.00
1BA 28.2 4.50
0BA 25.4 5.10