HL820ST Rock drill

Sandvik HL820ST Rock drill

Sandvik HL820ST is a hydraulic top hammer rock drill designed for DL311 and DL321 underground longhole drills. It is capable of drilling 54 - 89 mm holes up to 38 meters in depth, using T35, T38, T45, T51 MF-rods or 65 mm tube rods.

Sandvik HL820ST hydraulic rock drill is designed to ensure high drilling capacity, easy maintenance and low operating cost. The construction of the rock drill is based on the main body modules tied together with four short side bolts; this ensures a minimum number of joint faces and large contact surfaces. The percussion module is simple in design and consists of only two moving parts – the piston and the distributor sleeve around the piston and the moving parts are not in contact with the rock drill body modules.

Sandvik HL820ST is fitted with a drill stabilizer, which is designed to adjust percussion power according to variations in rock conditions which ensures good rock/bit contact and energy transfer, high penetration rate and rock tool service life.

There are two rotation motor variants to meet the rotation torque and RPM requirements of different hole diameters and rock formations. The optional power extractor is used for opening rock tool joints manually or automatically when using one-hole or fan automation and the design of the HL820ST is covered by several patents.

Technical data
Hole diameter range 54 - 89 mm
Kinetic power 21 kW
Percussion rate 42 - 53 Hz
Operating pressure

80 - 200 bar
Up to 200 bar
Rotation motor type OMT200 / 250
Stabilizer Sleeve type
Shank length 600 mm
Rock tools and hole diameters
Thread Rod mm Hole mm
T35 39 54 - 57
T38 39 64
T45 46 76
T45 65 (tube) 76 - 89
T51 52 89