GAST Air Motor 4-AM-FRV-63A

Air Motors & Mixers

GAST Air Motor 4-AM-FRV-63A

The 4AM-FRV-63A is a foot-mounted, reversible 1.27 kW (1.7 HP) GAST 4AM air motor with an 8-vane rotor for higher starting torque, 3,000 rpm free speed and a keyed output shaft.

  • Air
    Powered
  • ATEX
    Safe
  • Variable
    Speed
  • Reversible

Explosion-Proof Power
for Hazardous Areas

The 4AM is GAST's most widely used air-motor frame: 1.27 kW at 3,000 rpm from a cast-iron body about 150 mm long. The F in the model code denotes a foot (base) mounting, so the motor bolts to a plate or machine frame like a conventional foot-mounted electric motor. The -63A configuration uses an 8-vane rotor rather than the standard 4 vanes, which gives smoother torque and a higher starting torque at low speed.

Frame-level figures (torque, air consumption, shaft) are taken from the GAST 4AM datasheets for the sister models 4AM-NRV-22B and 4AM-NRV-54A and are marked indicative above. Like all AM motors it can be throttled from 300 to 3,000 rpm, stalled without damage and reversed instantly, and carries CE / ATEX II 2 GD c T4 marking.

  • 8-vane
    Rotor
  • 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) (indicative, 4AM frame) / 3.16 Nm (28 in-lb) (indicative, 4AM frame)
Torque at max speed4.07 Nm (36 in-lb) (indicative, 4AM frame)
Air consumption (max)36.8 L/s (2.2 m³/min, 78 cfm) (indicative, 4AM frame)
Air inlet / exhaust port1/4" NPT (indicative)
Output shaftKeyed, 12.7 mm (indicative, 4AM frame)
MountingFoot mount (F); NEMA 56C flange adapter available
RotationReversible (RV)
LubricationLubricated
Max operating pressure7 bar (100 psi)
Weightapprox. 3.6 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