Quarry Drill Rigs Compared: PRD HC 500 M vs PRD HC 500 D

Both rigs are built for quarry drilling and the dimension stone industry, and both sit on a compact 5-ton undercarriage with 2.5 km/h tramming. Their drilling jobs are different.

PRD HC 500 M: DTH blast holes

• Method: DTH (down-the-hole hammer)
• Hole diameter: 89–125 mm
• Drilling depth: 15 m
• Torque: 1,800 Nm; rotation 0–50 rpm
• Inclination: vertical and horizontal, 45° / 90° / 180°
• Engine: 55 hp deck engine

Choose it for bench blasting in quarries where you need larger holes to depth. See the PRD HC 500 M.

PRD HC 500 D: small top-hammer holes

• Method: top hammer
• Hole diameter: 38–45 mm
• Drilling depth: 3 m (10 ft)
• Torque: 160 Nm; rotation 150–300 rpm
• Inclination: 45°–90°
• Engine: 86 hp diesel prime mover

Choose it for small, short holes, typical of dimension stone work and secondary breaking. See the PRD HC 500 D.

Quick rule

Holes over 89 mm or deeper than 3 m: HC 500 M. Small holes of 38–45 mm, up to 3 m: HC 500 D.

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