KRD850 is a stripped version of the middle-weight rock drill KRD855, and is intended for mounting on a feed for block cutting in dimensional stone quarries. KRD850 has the same features as KRD850. The difference is that the control components for percussion, rotation and flushing are removed since the rock drill is supposed to be controlled from a rig.
Technical specifications for KRD850
Shank - 22x108
Water flushing - N/A
Air flushing - x
Weight (kg) - 25
Length overall (mm) - 533
Piston stroke (mm) - 60
Piston Dia (mm) - 85
Air cons. m3/ min at 5 bar - 3.5
Part No. 782800961E
Outstanding penetration rate
Although a middle-weight machine, the penetration rate of KRD850 is high, even compared to heavy-weight drills. The direct flow system in the valve makes air efficiency excellent. The 85mm diameter piston and the 60mm short stroke length provide percussion and torque surpassing other rock drills in its class. The design assures high speed drilling in all types of rock formations.
Long Service Life
Many new techniques are incorporated, both mechanically and materially, for greater durability and less wear of the different machine parts. The life of the components is greatly extended by using a full-lubrication system. The rifle bar and the piston, which are subjected to heavy work load, are specially heat treated to minimize wear and extend service life. The rifle nut, the front washer bushing and the sleeve nut that engages with them are made of high-quality phosphor bronze.