With one side connected to rock drill and the other side connected with taper drill bit, the taper drill rod transmits power from rock drill to bit, drilling work is thus performed. Tapered drill rod is a further development of the integral drill rods. It usually has a forged collar to maintain the proper shank striking face position in the rock drill.
Tapered drill rod effective lengths are measured from the collar to the bit end, which are usually from 0.6meter to 3.6 meters.
Parameters
Shank sizes: Hex.19mm, Hex. 22mm, Hex.25mm
Taper degrees: 7°, 11°, 12°.
Length: 400 – 8000mm.
Specifications:
Drilling duties in tunneling, construction, mining, quarrying, etc.
The relationship between taper angle and taper end diameter | |||
Taper Degree | Short/Long | Taper End | |
4°46’ | Short Skirt | 19.1mm | |
7° | Short Skirt | 16.0mm | |
11° | Short Skirt | 18.0mm | |
12° | Short Skirt | 16.8mm | |
12° | Long Skirt | 14.9mm |