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Machine Nut Tap Metric Coarse
BS949
Nominal
Diameter
d/ins
Pitch
Overall
Length
L ins
Length of
Thread
l ins
Diameter
of Shank
d 1 ins
Square A/F
ins
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Length of
Square
l 2 ins
M2.5 0.45 3.25 0.625 0.072 - -
M3 0.50 3.50 0.750 0.086 - -
M4 0.70 4.00 1.000 0.116 0.087 0.281
M5 0.80 4.25 1.250 0.147 0.111 0.312
M6 1.00 5.00 1.625 0.182 0.133 0.562
M7 1.00 5.00 1.625 0.221 0.165 0.562
M8 1.25 5.50 1.812 0.248 0.185 0.625
M10 1.50 6.00 2.000 0.312 0.234 0.687
M12 1.75 7.00 2.500 0.377 0.282 0.875
M14 2.00 7.50 2.750 0.444 0.333 0.875
M16 2.00 8.00 3.000 0.522 0.391 0.937
M18 2.50 8.50 3.000 0.575 0.431 1.000
M20 2.50 9.00 3.250 0.654 0.490 1.000
M22 2.50 10.00 3.625 0.734 0.550 1.062
M24 3.00 10.00 3.625 0.785 0.580 1.062
Machine Nut Tap - Metric Coarse
M2.5 M3 M4 M5 M6 M7 M8 M10 M12 M14 M16 M18 M20 M22
No. of Flutes 3 3 3 3 3 3 3 3 3 3 3 3 3 3
M24
No. of Flutes 3
Machine Nut Tap UNC
BS949
Nominal
Diameter
d/ins
TPI
Overall
Length
L ins
Length of
Thread
l ins
Diameter
of Shank
d 1 ins
Square A/F
ins
Length of
Square
l 2 ins
No. 6 32 3.75 0.750 0.090 0.070 0.250
No. 8 32 3.75 1.000 0.113 0.087 0.281
No.10 24 4.25 1.250 0.132 0.100 0.312
1/4 20 5.00 1.625 0.185 0.139 0.562
5/16 18 5.50 1.812 0.240 0.180 0.625
3/8 16 6.00 2.000 0.294 0.220 0.687
7/16 14 6.50 2.375 0.345 0.259 0.750
1/2 13 7.00 2.500 0.367 0.275 0.875
9/16 12 7.50 2.750 0.450 0.337 0.875
5/8 11 8.00 3.000 0.503 0.377 0.937
3/4 10 9.00 3.250 0.616 0.462 1.000
7/8 9 10.00 3.625 0.727 0.545 1.062
1 8 11.00 4.000 0.834 0.625 1.125
LONG REACH TAPS
HIGH SPEED STEEL
GROUND THREAD
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