
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 power | 1.27 kW (1.7 HP) |
|---|---|
| Max speed (free) | 3,000 rpm |
| Torque: max / starting @ 5.5 bar | 6.33 Nm (56 in-lb) (indicative, 4AM frame) / 3.16 Nm (28 in-lb) (indicative, 4AM frame) |
| Torque at max speed | 4.07 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 port | 1/4" NPT (indicative) |
| Output shaft | Keyed, 12.7 mm (indicative, 4AM frame) |
| Mounting | Foot mount (F); NEMA 56C flange adapter available |
| Rotation | Reversible (RV) |
| Lubrication | Lubricated |
| Max operating pressure | 7 bar (100 psi) |
| Weight | approx. 3.6 kg (indicative) |
Materials
| Body & End Plates | Cast Iron or Aluminium |
|---|---|
| Rotor | Steel, dynamically balanced |
| Vanes | Composite, self-lubricating |
| Shaft | Stainless Steel |
| Bearings | Sealed ball bearings |
| Muffler | Aluminium / sintered bronze |
Performance Curve
- 6.9 bar (100 psi)
- 5.5 bar (80 psi)
- 4.1 bar (60 psi)
- 2.8 bar (40 psi)
Dimensions
| Frame | Power (kW) | Length (mm) | Diameter (mm) | Shaft Ø (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 1AM / 1UP | 0.03–0.1 | 92 | 58 | 8 | 0.8 |
| 2AM | 0.3–0.7 | 125 | 78 | 12 | 2.3 |
| 4AMthis model | 0.7–1.3 | 180 | 100 | 16 | 4.5 |
| 6AM | 2.0–3.0 | 250 | 140 | 22 | 13 |
| 8AM | 3.5–5.5 | 300 | 180 | 28 | 24 |
Typical dimensions for the model range; certified dimensional drawings are available on request.
Downloads
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