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  • Innovative Design
    Compatible with the Ditch Witch JT4020 All Terrain, JT60 All Terrain and JT100 All Terrain directional drills, the All Terrain Air Hammer quickly and cost-effectively cuts through the hardest rock.

    Unlike other air hammers on the market, the All Terrain Air Hammer requires no oiler or drilling mud, which reduces overall cost of production. All Terrain Air Hammer is lubricated by water and able to work in even the most sensitive environmental areas.

    Complete kit includes: All Terrain Air Hammer; convex bit, bit jaw and jaw assembly; two slide pins; Rockmaster Air Housing; and a fluid pump and air adapter kit.

  • Power
    All Terrain Air Hammer is designed to penetrate exceptionally hard rock of 20,000 psi (1379 bar) to 35,000 psi (2413 bar) and harder, where rotary units and mud motors lose effectiveness; Air Hammer is over 50 percent more productive in hard rock than rotary drilling.
  • Superior Support
    Your Ditch Witch equipment is backed by a worldwide network of dealers you can count on for unmatched commitment to your success. From genuine Ditch Witch parts to factory-trained service to expert advice, your Ditch Witch dealer has it all for you.
  • Productivity
    Advanced technology enables the All Terrain Air Hammer to continuously drill as it is being steered, an exclusive All Terrain drill feature that results in superior productivity; other air hammers require stopping the drill rotation to change directions.

    Peak performance is achieved when used with the Rockmaster™ Air Housing (included in All Terrain Air Hammer kit), which features larger air ports that help increase production.

    Both the JT4020 All Terrain and JT100 All Terrain have standard cruise control that maintains thrust and rotation settings, which reduces operator effort and increases productivity.

    Minimal cost of spoils cleanup: used properly, the All Terrain Air Hammer leaves only dry cuttings and a relatively small amount of foam used downhole to remove cuttings.

    A very low flow rate—4 gpm (15 l/min)—means low fluid costs; a patented hydro cyclone features an impeller (rotor blade) that reduces that amount of fluid in the Air Hammer and on the jobsite.

  • Dimensions
    • Standard drill pipe connection
      3.5 in API Reg Pin
    • Outside diameter
      5.4 in
      138.2 mm 
    • Length w/out bit shoulder to shoulder
      44.6 in
      1131.8 mm 
    • Length w/bit extended
      49.5 in
      1256.3 mm 
    • Length w/bit retracted
      48.1 in
      1220.7 mm
    • Weight w/out bit
      200 lb
      90.9 kg
    • Bit size
      6.5 in
      165.1 mm
    • Recommended air pressure
      350 psi
      24.1 bar
    • Make-up torque
      6000 ft·lb
      8124 N·m 
    • Recommended fluid flow
      3-4 gpm
      11.3-15.1 l/min
    • Air consumption 24.1 bar/350 psi
      973 l/s
      458 scfm 
    • Percussion rates
      1,770 b