Long Shank Machine Taps

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Table Shows General Dimensions on Long Shank Machine Taps


Nominal Dai d
MM's
Nominal Dai d
Inches
ISO
Metric
Thread Designations Length Dia of
Shank
Length
of
Square
Size of
Square
Above Up To Above Up To
ISO
Metric
UNC UNF` BSW BSF BA
Overall
Length
L
LENGTH
OF
THREAD
MAX
D 2 a
2.8 3.2 .1102 .1260 M3 No.5-40 No.5-44 1/8/-40 5 66 11 2.24 4 1.8
3.2 3.6 .126 .1417 M3.5 No.6-32 No.6-40 " 4 68 13 2.50 4 2.0
3.6 4.00(M) .1417 .1575 M4 73 13 3.15 5 2.5
3.6 4.50(O) .1575  .1772 No.8-32 No.8-36 3 73 13 3.15 5 2.5
4 4.50(M) .1575  .1772 M4.5 73 13 3.55 5 2.8
4.5 5.00(O) .1772 .1969 No.10-24 No.10-32 3/16-24 3/16-32 2 79 16 3.55 5 2.8
4.5 5.00(M) .1772  .1969 M5 79 16 4.00 6 3.15
5 5.6 .1969 .2205 No.12-24 No.12-28 1 84 17 4.00 6 3.15
5.6 6.35 .2205 .25 M6 0.25 -20 0.25 -28 0.25 -20 0.25 -26 0 89 19 4.50 6 3.55
6.35 7.2 .25 .2835 M7 9/32-26 89 19 5.60 7 4.5
7.2 8 .2835 .315 M8 5/16-18 5/16-24 5/16-18 5/16-22 97 22 6.30 8 5.0
8 9 .315 .3543 M9 97  22 7.10 8 5.6
9 10.00(D) .3543 .3937 3/8-16 03/08/2024 3/8/-16 3/8/-24 108 24 7.10  8 5.6
9 10.00(M) .3543 .3937 M10 108 24 8.00 9 6.3
10 10.6 .3937 .4173 114 24  7.10 8 5.6
10.6 11.8 .4173 .4646 M11 7/16-14 7/16-20 7/16-14 7/16-18 115 25 8.00 9 6.3
11.8 13.2 .4646 .5197 M12 0.5-13 0.5-20 0.5-12 0.5-16 119 29 9.00 10 7.1
13.2 15 .5197 .5906 M14 9/16-12 9/16-18 9/16-12 9/16-16 127 30 11.20 12 9.0
15 17 .5906  .6693 M16 5/8-11 9/16-18 5/8-11  5/8/-14 137 32 12.50 13 10
17 21.2 .6693 .8346 M18 149 37 14.00 14 11.2
M20 3/4-10 3/4/-16 3/4/-10 3/4/-12 149 37 14.00 14 11.2
21.2 23.6 .8346 .9291 M22 7/8-9 7/8/-14 7/8/-09 7/8/-11 158 38 16.00 16 12.5
23.6 26.5 .9291 1. 0433 M24 1"-8 1"-12 1"-8 1"-10 172 45 18.00 18 14.0

Certain Tap Blanks shown above are recommended for ISO Metric Threads and some only for Thread Forms. Where they are different the size range for ISO Metric are marked (M) and the size range for other thread forms are marked (O). For sizes above 26.50mm dia. the general dimensions are as for a Short Machine Tap but overall length increased by 50% of the Shank Length.


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