Top hammer rock drills
- Hole size
- 64 - 89 mm
- Percussion power
- 21 kW
- Percussion rate
- 71 Hz
Sandvik RD921 is a hydraulic rock drill designed for medium-diameter longhole drilling. It is the smallest of the RD900 series, the most powerful rock drill family in its class, capable of drilling 64 - 89 mm.
Three body modules
RD921 has three body modules joined with short side bolts, ensuring minimal joint faces and large contact surfaces. The percussion module consists of two moving parts, the piston and the distributor sleeve around the piston, which are guided by a single pilot cylinder for part alignment.
The stabilizer keeps the shank adapter in an optimal position in relation to the piston. This ensures good rock/bit contact and energy transfer, expanding the penetration rate and rock tool service life.
Heavy-duty rock drill
Designed for surface top hammer rigs, Sandvik RD921 drills holes up to 29 meters deep, with an optimal hole range of 76 to 89 mm, using T38 and T45 MF-rods.
Learn more about RD921 features
Two rotation motor variants
Two rotation motor options meet the rotation torque and RPM requirements in the RD921 application range.
The optional power extractor can be used for opening rock tool joints manually or automatically when using one-hole automation.
Circulating Shank Lubrication
Optional Circulating Shank Lubrication system can reduce shank lubrication oil consumption up to 300g per hour.