TwinBox Short machine tap Form C + reamer HSS-G NPT 1.1/2 x 11.5
€437.00
NPT is a conical pipe thread (taper ratio 1:16). Therefore the core hole should also be conical. For this purpose, VÖLKEL has developed the NPT TwinBoxes. Matching the NPT tap, the TwinBoxes contain precisely matching NPT reamers.
The advantage of a conical core hole when tapping NPT threads is that the tap has to cope with a considerably lower chip volume during tapping and is therefore less strained. The tool life time of the tap is thus increased and the surface of the cut thread is also better than when tapping in a cylindrical core hole.
Although it is possible to make core holes for NPT threads cylindrical, it is not recommended because the tap then has to cope with considerably more chip volume. This leads to additional load on the tool, the risk of chip accumulation and the cutting quality of the thread is negatively affected.
Application:
for general use
- non abrasive material up to 900 N/mm²
- unalloyed and low alloyed steel
- for thread cutting by hand and machine
- for through and blind holes
| Type of thread | american tapered pipe thread, taper 1:16 |
|---|---|
| Standard | DIN |
| Form | Form C |
| Material | HSS-G |
| Tolerance | medium |
| Size | NPT 1.1/2 x 11.5 |
| Overall length (L1) | 140 mm |
| Thread length (L2) | 42 mm |
| Core hole diameter (D1) | 44.0 mm |
| Shank diameter (D2) | 36.0 mm |
| Drive connector | 29.0 mm |
| Item number | 63598 |
| Type of flute | straight fluted |
| Application | for through and blind holes |
| Thread standard | ANSI B1.20.1 |
