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Common Thread Specifications

Recommended Drill Sizes for AB Type Self Tapping Screws into Metal

Screw Size Plate Gauge Drilled or punched hole diameter
Gauge No. Metric Equiv. Metal Thickness Steel, Stainless, Copper, Brass, Nickel Hole Dia. Aluminium Hole Dia.
#2 2.2 0.46 1.63
0.61 1.70 1.63
0.76 1.78 1.63
1.22 1.85 1.70
1.52 1.85 1.70
#4 2.9 0.46 2.18
0.61 2.26
0.76 2.39
1.22 2.44 2.18
1.52 2.54 2.26
2.67 2.59 2.39
#6 3.5 0.46 2.64
0.76 2.69
0.91 2.79
1.22 2.82 2.64
1.52 2.95 2.69
1.91 3.05 2.79
2.67 3.25 2.82
3.25
6.35 3.05
#8 4.2 0.91 3.18 3.05
1.22 3.25 3.25
1.52 3.45 3.45
1.91 3.56 3.56
2.67 3.81 3.73
3.43 3.86 3.78
4.11
9.53 3.86
#10 4.8 0.76 3.66
0.91 3.73
1.91 3.99
2.67 4.09 3.73
3.43 4.32 3.91
4.11 4.39 4.04
5.08
9.53 4.22
#12 5.5 0.91 4.22
1.22 4.32 4.09
1.52 4.50 4.22
1.91 4.62 4.39
2.67 4.70 4.57
3.43 4.98 4.63
4.11 5.11 4.80
5.08
9.53 4.98
#14 6.3 1.22 4.93
1.52 5.05 5.05
1.91 5.18 5.11
2.67 5.31 5.18
3.43 5.79 5.31
4.93 5.94 5.61
5.08
9.53 5.79

Metric

150 Metric Course 150 Metric
Nom. Dia. Major Dia. Dia. Inch Thread Pitch Thread Pitch
M1.6 1.60 0.0630 0.35
M1.8 1.80 0.0709 0.35
M2 2.00 0.0787 0.40
M2.2 2.2 0.0866 0.45
M2.5 2.50 0.0984 0.45
M3 3.00 0.1181 0.50
M3.5 3.50 0.1387 0.60
M4 4.00 0.1575 0.70
M4.5 4.50 0.1772 0.75
M5 5.00 0.1969 0.80
M6 6.00 0.2362 1.00
M8 8.00 0.3150 1.25 1.00
M10 10.00 0.3937 1.50 1.25
M12 12.00 0.4724 1.75 1.50
M14 14.00 0.5514 2.00 1.50
M16 16.00 0.6299 2.00 1.50
M18 18.00 0.7087 2.50 1.50
M20 18.00 0.7874 2.50 1.50
M24 24.00 0.9449 13.00 2.00

Imperial

Unified Inch Products B.S Inch Products
Nom. Dia Major Dia. T.P.I. Nom. Dia T.P.I.
mm inch UNC UNF BSW BSF
#0 1.52 0.060 80
#1 1.85 0.073 64 72
#2 2.18 0.086 56 64
#3 2.51 0.099 48 56
#4 2.84 0.112 40 48
#5 3.18 0.125 40 44 1/8 40
#6 3.51 0.138 32 40
#8 4.17 0.164 32 36
#10 4.83 0.190 24 32 3/16 24 32
#12 5.49 0.216 24 28
(#14) 1/4 6.35 0.250 20 28 1/4 20 26
5/16 7.95 0.313 18 24 5/16 18 22
3/8 9.53 0.375 16 24 3/8 16 22
7/16 11.13 0.438 14 20 7/16 14 16
1/2 12.70 0.500 13 20 1/2 12 16
9/16 14.30 0.563 12 18 9/16 12 16
5/8 15.88 0.625 11 18 5/8 11 14
3/4 19.05 0.750 10 16 3/4 10 12
7/8 22.23 0.875 9 14 7/8 9 11
1 25.40 1.000 8 12 1 8 10

Every effort has been made to ensure the accuracy of information provided. Sentinel Group cannot warrant the information however, expressly or implied, and any liability arising from it is expressly excluded. Customers must satisfy themselves as to the suitability of products and the technical information relating to them, and it is recommended that you conduct your own tests to establish suitablity. This does not effect your statutory rights.

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