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GAST

Gast Manufacturing is a US-based manufacturer of air-moving and air-driven equipment, with a product history dating to the early 20th century. The company's catalog centers on rotary vane air motors, regenerative blowers, rotary vane compressors and vacuum pumps, piston compressors, diaphragm pumps, and the replacement parts that support those lines. These products are used wherever compressed air or vacuum is the motive force: packaging machinery, mixing and agitation, tensioning and winding, vacuum hold-down, pneumatic conveying, aeration, and general industrial vacuum or pressure supply. 3G Electric supplies the Gast line globally, with stock and sourcing across the full range of motorized and non-motorized configurations.

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About GAST

Gast Manufacturing is a US-based manufacturer of air-moving and air-driven equipment, with a product history dating to the early 20th century. The company's catalog centers on rotary vane air motors, regenerative blowers, rotary vane compressors and vacuum pumps, piston compressors, diaphragm pumps, and the replacement parts that support those lines. These products are used wherever compressed air or vacuum is the motive force: packaging machinery, mixing and agitation, tensioning and winding, vacuum hold-down, pneumatic conveying, aeration, and general industrial vacuum or pressure supply. 3G Electric supplies the Gast line globally, with stock and sourcing across the full range of motorized and non-motorized configurations.

Gast rotary vane air motors are available in output ratings from fractional horsepower up to roughly 5 hp in the configurations 3G Electric carries. Representative models include the 6AM series (4 hp, 84 in-lb at 3,000 RPM, 130 cfm, 1/2 in NPT, foot mount), the 4AM series (1.7 hp, 35 in-lb at 3,000 RPM, 72 cfm, available with 1/4 in NPT or 3/8 in BSP ports and foot or face mounting), and the 8AM series (5 hp, 132 in-lb at 2,500 RPM, 175 cfm, 1/2 in NPT, face mount). These units share a cast iron housing, reversible CW/CCW rotation, and a vane design that tolerates stall conditions without the burn-out risk associated with electric motors in similar duty. Port sizing, mounting style, and shaft dimensions vary by model, so selection depends on the required torque-speed point and the available air supply.

Gast rotary vane compressor/vacuum pumps are supplied both as bare units (without motor) and as motorized packages. The non-motorized versions 3G Electric lists include the 6066-V103 (5 hp equivalent, 45–55 cfm, 25 in Hg max vacuum, 15 psi max continuous pressure) and the 2565-V2A (1.5 hp equivalent, 21 cfm free air, 16.5 cfm at 15 psi, 21 in Hg max vacuum, 15 psi max continuous pressure). These are typically coupled to a customer-supplied motor or used as replacement heads on existing packages. The rotary vane design produces pulsation-free flow, which suits vacuum holding, printing and packaging, and continuous-duty pressure or vacuum supply.

Beyond complete machines, 3G Electric carries Gast replacement parts and service components. Examples include the AF817 leaf valve for Gast compressor heads, which controls airflow direction within the compression cycle, and molded elastomeric O-rings such as AP513B for sealing between cylinder heads, valve plates, and manifold assemblies. These parts support maintenance and overhaul of Gast compressors, vacuum pumps, and related pneumatic equipment.

For technical buyers, the relevant selection variables across the Gast line are output power, torque at rated speed, air consumption, port type and size (NPT or BSP), mounting configuration (foot or face), rotation direction, and vacuum or pressure limits. 3G Electric provides model-level specifications, manufacturer part numbers, and country-of-origin data where available, and can source both current-production and replacement items. The catalog is structured so that plant engineers and maintenance planners can match a motor, pump, or part to an existing installation by model number, port size, and mounting pattern.

Common Applications

  • Packaging machinery — Gast 4AM and 6AM rotary vane air motors for indexing, tensioning, and film feed drives
  • Vacuum hold-down and pick-and-place — Gast 6066-V103 and 2565-V2A rotary vane vacuum pumps for suction cups and fixture clamping
  • Pneumatic conveying and aeration — Gast regenerative blowers and rotary vane compressors for air supply in material handling
  • Mixer and agitator drives — Gast 8AM-NRV-32A air motor for variable-speed, reversible mixing in hazardous or washdown areas
  • Compressor and vacuum pump maintenance — Gast AF817 leaf valves and AP513B O-rings for overhaul of existing pump heads
  • Winding and web handling — Gast reversible air motors for constant-tension winders and unwind stands

Frequently asked questions

Common questions about GAST from 3G Electric.

What is the difference between the Gast 4AM, 6AM, and 8AM rotary vane air motor series?

The series designations correspond to frame size and output range. The 4AM series delivers 1.7 hp with 35 in-lb torque at 3,000 RPM and 72 cfm air consumption, with port options including 1/4 in NPT and 3/8 in BSP. The 6AM series steps up to 4 hp, 84 in-lb at 3,000 RPM, and 130 cfm through a 1/2 in NPT port. The 8AM series is rated 5 hp, 132 in-lb at 2,500 RPM, and 175 cfm, also with a 1/2 in NPT port. Mounting style and shaft dimensions differ by model, so confirm the mounting pattern and port size against the existing installation before specifying a replacement.

Can Gast rotary vane air motors be run in both directions?

Yes. The Gast air motors listed by 3G Electric, including the 4AM-FRV-13C, 4AM-ARV-120, 6AM, and 8AM-NRV-32A, are reversible CW/CCW. Reversibility is achieved by controlling the air inlet and exhaust ports, so the motor can be plumbed for either rotation without internal modification. This is useful in applications where the driven equipment must reverse, such as winding, indexing, or positioning tasks. Note that torque and speed characteristics are symmetric in most vane motor designs, but confirm the specific model's performance data if the application is sensitive to direction-dependent output.

What are the vacuum and pressure limits of the Gast 6066-V103 and 2565-V2A rotary vane pumps?

The Gast 6066-V103 is rated to a maximum vacuum of 25 in Hg and a maximum continuous pressure of 15 psi, with flow of 45 to 55 cfm. The Gast 2565-V2A is rated to a maximum vacuum of 21 in Hg and a maximum continuous pressure of 15 psi, with 21 cfm free air and 16.5 cfm at 15 psi. Both are supplied without motors, so the drive must be sized to the pump's speed and power requirement. Continuous operation at the stated pressure limit is acceptable; exceeding it will increase wear and may reduce service life.

What replacement parts does 3G Electric carry for Gast compressors and vacuum pumps?

3G Electric stocks Gast service parts including the AF817 leaf valve, which controls airflow direction within the compressor head, and molded elastomeric O-rings such as AP513B for sealing between cylinder heads, valve plates, and manifold assemblies. These parts are used in maintenance and overhaul of Gast rotary vane compressors, vacuum pumps, and related pneumatic equipment. When ordering, match the manufacturer part number to the pump or compressor model to ensure correct fit and material compatibility.

How do I select a Gast air motor for a specific torque and speed requirement?

Start with the required torque at the operating speed, then match it to the motor's rated output. For example, if the application needs approximately 35 in-lb at 3,000 RPM, the Gast 4AM series is the appropriate frame size; for 84 in-lb at 3,000 RPM, the 6AM series; for 132 in-lb at 2,500 RPM, the 8AM series. Also confirm air consumption (72, 130, and 175 cfm respectively) against the available compressed air supply, and verify port type (NPT or BSP), mounting (foot or face), and shaft dimensions. Air motors can be stalled without damage, but sustained operation below rated speed reduces efficiency.

Are Gast air motors and vacuum pumps available with BSP or NPT ports?

Both port standards appear in the Gast line. The 4AM-ARV-120 uses a 3/8 in BSP port, while the 4AM-FRV-13C uses 1/4 in NPT, and the 6AM and 8AM models use 1/2 in NPT. Port type is fixed by model, so if the existing piping is one standard, select the corresponding model number. Adapters are available but add a potential leak path; specifying the correct port at the motor is preferable for permanent installations.