STR-138 SPT Testing Drill Rig

SPT & Wireline Core Test Drill Rig

Starting at


Financing Term
Monthly Payment
$ usd
Section 179
Tax Deduction?
$ usd

The STR-138 is a mini drill rig for SPT soil testing, wireline coring and rotary drilling, and is the perfect entry level SPT rig. This small yet very powerful drilling rig is designed for tight job sites while still having all the features needed for SPT testing and wireline core drilling.

The STR-138 has a 38hp tier-4 diesel engine, a water / mud pump, retractable tower, a 4-speed gearbox drill motor with wet swivel and dual wireline winches.

The STR-138 can be ordered with manual or automatic SPT hammer system.

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Compact SPT drill rig machine with automahammer and rotary drill head STR-138 drill rig for SPT soil testing Our STR-138, comes with wireline winch, rotary core drilling head and spt autohammer Our STR-138 SPT, wireline, rotary core drill rig, in a jobsite. Picture of the SPT tower of our STR-138, a drill rig for SPT soil test, wireline coring and rotary drilling. The 4 speed rotary gearbox in our STR-138. The STR-138 for SPT soil sampling, wireline core drilling and rotary drilling. The STR-138 has a built in water and mud pump for wet drilling. Track mounted drill rig for SPT soil test and rotary drilling. One of the control panels in our STR-138 drilling rig. Heavy duty wet swivel with quick change connectors, in our STR-138 SPT, rotary drilling and wireline coring drill rig. Drill pipe and rod clamp, located at the bottom of the mast in our STR-138 drill rig. Picture of our STR-138 drill rig, with its mast tilted for travel.



  • 38 hp (28.35 kW) tier-4 compliant, turbo charged diesel engine
  • Water cooled
  • 12 V electric start
  • Emergency stop button
  • Rpm gauge
  • Oil pressure gauge

Hydraulic System

  • 22 gpm (83.3 lpm) max combined hydraulic flow
  • Max 3000 psi (206 bar)
  • Load sensing variable displacement axial piston pump
  • Feather touch controls
  • Oil cooler

Track System

  • Stationary track system (260 mm wide 1676 mm long - 10.2” wide 66” long)
  • NACHI 2B track motor with automatic brake system
  • Built-in grease filled tensioning arm and spring


  • Chain driven mast
  • V-Rollers
  • Tilt rotate for travel
  • Standard mast 5.5 ft (1.67 m) stroke or extended mast 10.5 ft (3.2 m) stroke

Pipe Clamp

  • Single pipe/rod bottom clamp
  • Size capability from 1.5” to 6” (Other sizes available)

Telescopic SPT Tower

  • Telescopic SPT tower
  • 19 ft (5.79 m) max height (longer travel available)
  • Dual pulley system - SPT rope pulley and wireline pulley. Tower counterbalance hydraulic locking system

Mud Pump

  • Moyno 3CL4 (or equivalent) continuous flow stator / rotor style mud pump
  • Up to 225 psi (15.5 bar)
  • 25 gpm flow (94 lpm)
  • Independent hydraulic motor
  • Quick coupling
  • Mounted on drill rig frame

SPT Hammer System

  • Rotary capstan system for manual SPT hammer (SPT hammer sold separately) (Auto hammer option available)

Leveling Outriggers

  • 4 hydraulic level outriggers with independent controls

Drill Motor - Rotary Gearbox MS-500

  • Gear 1: 60 rpm at 4580 ft lbs (6209 Nm) torque
  • Gear 2: 120 rpm at 2290 ft lbs (3104 Nm) torque
  • Gear 3: 241 rpm at 1145 ft lbs (1552 Nm) torque
  • Gear 4: 482 rpm at 573 ft lbs (776 Nm) torque
  • Built-in heavy duty wet swivel (see below)

Heavy Duty Wet Swivel

  • Top intake
  • One quick-change connectors (AWJ, AW, BW, BWL, NW, NWL, HW, HWL, PW, PWL) others available
  • Automatic spring floating system

Lifting Winch

  • 4,500 lbs (2,041 kg) lift capacity
  • Planetary gear
  • 2 ft/sec travel speed
  • Balance weight and locking hook
  • ¼”- ½” (6-12 mm) cable diameter

Second Winch

  • For wireline operations
  • 1,000 lbs (453 kg) lift capacity
  • 3.5 ft/sec travel speed

Fuel Tank

  • 10 gallon (37.8 liters) fuel tank with fuel sending sensor

Hydraulic Tank

  • 20 gallon (75 liters) hydraulic oil tank with built in site level glass

Depth Capacity

  • 150-250 feet


  • Remote control for driving operations
  • Various auger drill heads available
  • Automatic drop hammer 140 lbs (63 kg)
  • Manual drop hammer 140 lbs (63 kg)
  • Dual pipe clamp with breakout
  • Direct push drill head
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