Designed to endure
demanding enviroments


Doofor rock drill DF550L-BLT
High-performance hydraulic rock drill

Doofor DF550L-BLT is a rock drill equipped with multiple sealing and hermetic rotation mechanism for demanding underground conditions. The stainless steel BLT-flushing head can be turned upside down. Rotation motor can be placed on the left or right. Motor fitting direction can be specified (up, down or side).

DF550L-BLT is a high-frequency hydraulic rock drill specially designed for underground production drilling and tunneling. The DF550L has a very low overhead, only 84mm from the drill center line. The rotation motor of the DF550L can be installed on the right-hand or the left-hand side.

The rock drill has a separated flushing box. Flushing media can be water or air. It can be equipped with shank adapters (striker bars) R32, R38, T38, and T45.

Optimal maximum hole diameter for the DF550L is 76mm.

Technical Data
Nominal power class17 kW
Percussion pressure160 bar
(Percussion oil-flow)(95-120 litres/min)
Rotation motor125 cm3
Speed max.250 rpm
Torque*796 Nm
Oil flow*40 litres/min (max. 90 litres/min)
Gear ratio65/40
LubricationAir-oil mist, min. 200 g/h
Flushing air pressure5–7 bar
Flushing air flow4000 litres/min
Flushing water flow150 litres/min
Weight170 kg

76 mm

Optimal maximum
hole diameter

17 kW

Power class

R32, R38
T38, T45

Shank size



*) Numbers given are for standard rotation motor (125cm³) at an intermittent pressure of 275bar [3989psi]. Motor options are 80cm³, 100cm³, 125cm³, 160cm³, 200cm³ and 250cm³ (200 & 250 cm³ motors can be installed on left hand side only).  For professional use only as a component of a hydraulic system.

Feed force (pressure) must be adjustable during operation. Rotation torque and oil flow values given are for a typical rotation motor. See full brochure for detailed information on different rotation motors. Percussion pressure mentioned is a recommended value for a typical application. The product is intended for professional use by skilled personnel. Doofor reserves all rights for changes without prior notice.

©2019 Doofor Inc