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GAST Air Motor 4AM-NRV-50C

Air Motors & Mixers

GAST Air Motor 4AM-NRV-50C

The 4AM-NRV-50C is the NEMA 56C flange-mounted version of GAST's 1.27 kW (1.7 HP) reversible 4AM air motor, with 3,000 rpm free speed, 1/4" NPT ports and a 12.7 mm keyed shaft.

  • Air
    Powered
  • ATEX
    Safe
  • Variable
    Speed
  • Reversible

Explosion-Proof Power
for Hazardous Areas

The -50C configuration fits the 4AM motor with a NEMA 56C C-face flange, the standard North-American interface for small gear reducers, pump heads and bell housings. Performance is the full 4AM frame rating: 1.27 kW at 3,000 rpm, 6.33 Nm maximum torque and about 36.8 L/s of air at 7 bar.

As a reversible (RV) model the motor has two 1/4" NPT ports and is controlled with a 4-way valve; speed is set by supply pressure. The motor can be stalled or overloaded indefinitely, runs cool, and is CE / ATEX II 2 GD c T4 marked for Zone 1 and 2.

  • NEMA 56C
    Flange
  • Instant
    Stall-Safe Torque
  • Cool
    Running
  • Compact
    Footprint

Technical Specifications

Max power1.27 kW (1.7 HP)
Max speed (free)3,000 rpm
Torque: max / starting @ 5.5 bar6.33 Nm (56 in-lb) / 3.16 Nm (28 in-lb) (indicative, 4AM frame)
Torque at max speed4.07 Nm (36 in-lb)
Air consumption (max)36.8 L/s (2.2 m³/min, 78 cfm)
Air inlet / exhaust port1/4" NPT
Output shaftKeyed, 12.7 mm (0.5 in)
MountingFlange, NEMA 56C
RotationReversible (RV)
LubricationLubricated
Max operating pressure7 bar (100 psi)
Weightapprox. 4.1 kg (indicative)

Materials

Body & End PlatesCast Iron or Aluminium
RotorSteel, dynamically balanced
VanesComposite, self-lubricating
ShaftStainless Steel
BearingsSealed ball bearings
MufflerAluminium / sintered bronze

Performance Curve

024681005001,0001,5002,0002,5003,000Speed (rpm)Torque (Nm)
  • 6.9 bar (100 psi)
  • 5.5 bar (80 psi)
  • 4.1 bar (60 psi)
  • 2.8 bar (40 psi)
Indicative torque versus speed at four air inlet pressures (starting torque at 5.5 bar as reference); power peaks at roughly half of free speed. Certified GAST curves are supplied with the datasheet.

Dimensions

FramePower (kW)Length (mm)Diameter (mm)Shaft Ø (mm)Weight (kg)
1AM / 1UP0.03–0.1925880.8
2AM0.3–0.712578122.3
4AMthis model0.7–1.3180100164.5
6AM2.0–3.02501402213
8AM3.5–5.53001802824

Typical dimensions for the model range; certified dimensional drawings are available on request.

Downloads

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