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A German-made reciprocating triplex plunger pump.

Spheroidal cast iron crankcase with sight glass and vented dipstick; forged, through-hardened, ground and polished crankshaft; bronze connecting rods; hardened stainless steel plunger bases; stainless plungers with hardened metal coating; Aramid/Teflon packing; stainless steel valves; machined stainless steel manifold.

WARNING: This product might contain a chemical known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to

Specification US Metric
Flow10.5 GPM40 L/min
Maximum Discharge Pressure8700 PSI600 bar
Crankshaft Speed1000 RPM
Power63.6 HP47.4 KW
Max Temperature140 °F60 °C
Inlet Port Size(2) 3/4" BSP
Discharge Port Size(2) 1/2" BSP
Plunger Diameter0.79 in.20 mm
Stroke0.79 in.46 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter35 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity1.2 gal 4.6 L
Weight176 lbs.80 kg

Horsepower Specifications

RPM GPM 5000 PSI 6000 PSI 7000 PSI 8000 PSI 8700 PSI
500 5.3 18.3 21.9 25.6 29.2 31.8
600 6.4 22.1 26.5 30.9 35.3 38.4
700 7.4 25.5 30.6 35.7 40.8 44.4
800 8.5 29.3 35.2 41.0 46.9 46.9
900 9.5 32.8 39.3 45.9 52.4 57.0
1000 10.6 36.6 43.9 51.2 58.5 63.6

Specification Images

Additional Drawings

  • GP5120 Exploded View
  • GP5120 Parts List
  • GP5120 Torque Specifications


  • Giant Industries Limited Warranty
  • GP5120 Installation Instructions
  • GP5120 Repair Instructions
  • Troubleshooting Guide


Sample Pump

Our Company

For 50 years, Giant Pumps has offered the most dependable positive displacement high-pressure triplex pumps available. Designed and built to the highest quality standards, customers count on Giant Pumps products to keep their equipment running. Every design detail of Giant Pumps products is optimized for long-life and reliable performance, making Giant Pumps the most trusted name in high-pressure pumps and systems.

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