Coal bolters

Fletcher Model CHDDR-4

  • Four mast feed roof drill
  • Walk-through chassis design
  • Fletcher crawler drive system
  • Automated temporary roof support (ATRS)
  • Certified drill canopies

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The Fletcher CHDDR-4 is a four-mast feed roof drill. The bolter is run by two operators, each working two separate drill masts. With operator slide-out platforms, operators can use detented controls to bolt the inside, outside, and toward the rib. Because the masts operate independently from each other, operators can simultaneously perform separate tasks, maximizing production time.

  • Walk-through chassis design element eliminates the need to walk between the machine and the rib
  • With four mast-style drill rigs on the front platform, operators can drill four holes simultaneously
  • The two outside masts can rotate a total of 100 degrees front to back, 95 degrees towards the rib, and five degrees in. The mast also has the capability to rotate five degrees side to side
  • The two inside masts can rotate a total of five degrees front to back and 2.5 degrees in both directions. The masts can also rotate a total of 7.5 degrees side to side, 2.5 degrees in, and five degrees out.

Standard equipment includes:

  • Fletcher crawler drive system
  • Automatic spring set, hydraulic release brakes
  • MSHA-approved temporary roof support (ATRS)
  • Cable reel
  • High-pressure filters
  • Platform lift
  • Fire suppression system
  • Front and rear stabilizers
  • Certified drill canopies
  • Walk-through chassis
  • Hydraulic disconnect at operator's stations


Joy is the exclusive distributor and authorized service provider for J.H. Fletcher & Co. products worldwide, with the following country exceptions:

Not a distributor or authorized service provider

  • United States
  • Canada
  • Mexico
  • Australia
  • Norway

Non-exclusive distributor and authorized service provider

  • Poland 
  • Latin America
Height 1.79 m 70.5"
Chassis width 7.52 m 24" 8"
Length - overall 3.43 m 11" 3"
Crawler base 2.64 m 104"
Chassis underclearance 305 mm 12"
Weight (complete) 41,960 kg 92,505 lbs
Platform lift 2.53 m 99.8"
Platform extension 1.27 m 54"
  • Towing package
  • Methane monitors
  • Rotary impact drillheads
  • Wet drilling system
  • Venturi or motor oil fill
  • Hydraulic power take-off
  • Latch drilling circuit

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