Material Special Tool Steel
Hardness 58° to 60° HRC
HT-104
BA (British Association)
Thread Angle 55°
| Size No. | Major Diameter of Threads in Inches | Threads Per Inch | No. of FLutes | A Overall Length Inches |
B Thread Length Inches |
C Shank Diameter Inches |
|---|---|---|---|---|---|---|
| 0 | 0.2362 | 25.4 | 3 | 2-1/2 | 1 | 0.242 |
| 1 | 0.2087 | 28.2 | 3 | 2-3/8 | 7/8 | 0.213 |
| 2 | 0.1850 | 31.4 | 3 | 2-3/8 | 7/8 | 0.189 |
| 3 | 0.1614 | 34.8 | 3 | 2-1/8 | 3/4 | 0.166 |
| 4 | 0.1417 | 38.5 | 3 | 2 | 11/16 | 0.144 |
| 5 | 0.1260 | 43.0 | 3 | 1-15/16 | 5/8 | 0.128 |
| 6 | 0.1102 | 47.9 | 3 | 1-7/8 | 9/16 | 0.128 |
| 7 | 0.0984 | 52.9 | 3 | 1-13/16 | 1/2 | 0.128 |
| 8 | 0.0866 | 59.1 | 3 | 1-3/4 | 7/16 | 0.128 |
| 9 | 0.0748 | 65.1 | 3 | 1-11/16 | 3/8 | 0.128 |
| 10 | 0.0669 | 72.6 | 3 | 1-5/8 | 5/16 | 0.128 |
Notes:
BA hand taps are supplied in
a set of three pieces (Taper, Second & Bottoming).
You can order any Taper also.
Bottoming 1 1/2 threads chmfered use after threads have been started for tapping to bottom of holes, 23" per side
Second 3 to 5 threads chamfered for general use when tapping to bottom of holes is not optical 8" per side
Taper 8 to 10 threads chamfered for easy thread starting in rough material, 4" per side