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MRD-40 Rock Drill - 7/8 x 3-1/4

$1,590.00  $1,250.00
Save: 21% off

Weight: 52 lbs

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MRD-40 Rock Drill  - 7/8 x 3-1/4

Single-throttle lever controls all tool functions:  automatic-off, blow only, and progressive drill speeds.

We eliminated many high wear parts.  To you this means less loss of power due to wear, less downtime to replace worn parts, and lower overall maintenance costs.

With only two parts moving during operation, a non-corrosive automatic valve, less radial piston movement and high-tech alloys, our drills do not require special rock drill oil.  Under normal operating conditions, oil carry-over from the compressor combined with moisture in the air will provide sufficient lubrication.


  • Dead man safety handle
  • One control for drilling and blowing
  • Variable throttle control
  • Continuous hole cleaning
  • Direct rotation of the piston
  • Less maintenance
  • Minimal lubrication required
  • Oil reservoir
  • One-year parts warranty



Weight lbs 45-1/2
Length in


Bore & Stroke in 2-11/16 x 2-3/8
Impact Rate BPM 1800
Air Consumption CFM 80
Air Inlet Diameter in 3/4 NPT
Chuck Size in 7/8 x 3-1/4



Spare Parts List / Parts Breakdown



H & D Thread Steel and Bits



Seal Kit 68780046 Rock Drill Oil - 1 Gallon RDO1G
Blow Tube Plug Kit 68780047 Rock Drill Oil - 5 Gallon


Oil Plug Kit 68780050 Whip Check WCSML
Rotation Pawl Carrier 68721989 Contractors Air Hose AIRH-19-50R
Rotation Pawl 68721986 Hose Whip Assy w/ 3.7oz Lubricator TX7HW
Side Rod Bolt 68722099 Hose Whip Assy w/ 7.0oz Lubricator TX12HW
Side Rod Bolt Nut 68VE8181 Line Oiler LO-10PF


  • Model: SUL-68252227