The HL820ST main body modules are connected by four side bolts, minimizing the number of joint faces and large contact surfaces. Its simple percussion module has only two moving parts: the piston, distributor sleeve and moving parts are never in contact with the drill body modules.
To meet the torque and RPM requirements of different hole diameters and rock formations, the rotation motor comes in two types.
The HL820ST drill offers the optional power extractor for manual or automatic opening of rock tool joints when using one-hole or fan automation.
