Long Shank Machine Taps
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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