When a machine drive needs slower output speed with substantially higher turning force, the Cleco A8R311M A8 Series Reversible Axial Piston Air Motor delivers 2.7 HP, 450 RPM free speed, and 110 ft-lbs of stall torque for pneumatic-powered equipment. Its axial piston design (pistons arranged in line with the motor axis to create smooth rotary motion) gives machine builders, plant maintenance teams, and equipment rebuilders a compact air-powered drive for conveyors, mixers, rotary fixtures, lift-assist equipment, and custom industrial machinery.The 5.8-1 gear ratio reduces output speed while increasing torque availability compared with faster A8 Series models, making the A8R311M a practical choice when load control matters more than high RPM. Reversible operation supports clockwise or counterclockwise rotation when installed with the proper pneumatic control setup, while rear exhaust routes spent air away from the driven component to help simplify installation in guarded machinery, enclosed frames, and fixed equipment layouts.Type: Air Motor | Series: A8 Series | Motor Configuration: Axial Piston | Control: Reversible | Power: 2.7 HP / 2.01 kW | RPM at Max HP: 225 RPM | Free Speed: 450 RPM | Stall Torque: 110 ft-lbs | Spindle Type: 7/8″ Keyed Spindle | Gear Ratio: 5.8-1 | Length: 17.5″ | Air Consumption: 112 SCFM | Air Inlet: 1/2″ NPTF | Exhaust: Rear | Mounting: Face Mounting | Max Overhung Load at Stall: 1,000 lbsFeatures:Axial piston air motor construction provides high pneumatic output for machine drives, fixtures, and equipment-mounted rotary functions.Reversible control allows forward or reverse rotation when used with the correct pneumatic valve and control arrangement.5.8-1 gear ratio lowers motor speed and raises torque availability for controlled movement under load.Rear exhaust directs spent air away from the front of the motor and driven component for cleaner equipment integration.7/8″ keyed spindle provides positive mechanical engagement with compatible couplings, sprockets, pulleys, or custom drive hardware.Face mounting configuration supports fixed installation on machine frames, brackets, tooling stations, and production equipment.Air-powered operation supports stall-tolerant performance in applications where pneumatic drive power is preferred over electric motors.Made in USA: Applications:Machine building and automation driving indexing tables, rotary fixtures, transfer mechanisms, and custom pneumatic equipment.Mixing and agitation systems supplying lower-speed, higher-torque rotary motion for compatible mixers and process equipment.Material handling equipment powering conveyor sections, rollers, lift-assist functions, and controlled movement assemblies.Industrial MRO and rebuild work replacing existing A8 Series air motors or specifying a pneumatic motor during equipment refurbishment.Packaging and production machinery supporting reversible rotary functions where compressed air is already part of the machine system.FAQs:Q: What makes the A8R311M different from faster A8 Series models?A: The A8R311M uses a 5.8-1 gear ratio, giving it a lower 450 RPM free speed and higher 110 ft-lbs stall torque. It is better suited for slower, higher-load drive functions than direct-speed or lower-ratio A8 motors.Q: What does stall torque mean on this air motor?A: Stall torque is the torque available when the motor is stopped under load. For the A8R311M, the 110 ft-lbs rating helps buyers compare the motors low-speed load capability against the torque required by the machine or driven component.Q: Can this Cleco air motor run in both directions?A: Yes. The A8R311M is a reversible air motor, so it can provide rotation in either direction when paired with the correct pneumatic controls.Q: What air supply should be planned for this model?A: The A8R311M is listed with 112 SCFM air consumption and a 1/2″ NPTF air inlet. The compressor, piping, control valves, and FRL should be sized to maintain adequate airflow at the motor during loaded operation.Q: Can the A8R311M replace an electric motor?A: It can be used as a pneumatic alternative when the required speed, stall torque, mounting style, spindle connection, and air supply match the equipment. Final fit should always be checked against the machines mechanical and control requirements before ordering. .spec-accordion{width:100%;max-width:1200px;margin:1em auto;font-family:”Montserrat”,Arial,sans-serif;box-sizing:border-box} .spec-accordion *{box-sizing:border-box} .spec-accordion-toggle{width:100%;display:flex;justify-content:center;align-items:center;position:relative;background:#444;color:#fff;border:0;padding:14px 48px;font-family:”Bai Jamjuree”,Arial,sans-serif;font-size:16px;font-weight:700;text-transform:uppercase;cursor:pointer;text-align:center} .spec-accordion-toggle::after{content:”+”;font-size:22px;position:absolute;right:18px} .spec-accordion.open .spec-accordion-toggle::after{content:””} .spec-accordion-panel{display:none!important;width:100%;padding:16px 0 0} .spec-accordion.open .spec-accordion-panel{display:block!important} .spec-accordion-panel[hidden],.spec-accordion:not(.open) .spec-accordion-panel{display:none!important} .spec-table-wrapper{width:100%;max-width:1200px;margin:0 auto;overflow-x:visible!important;overflow-y:visible} .spec-table{width:100%!important;max-width:1200px;min-width:0!important;margin:0 auto;border-collapse:collapse;table-layout:fixed;font-family:”Montserrat”,Arial,sans-serif;font-size:12px;color:#000} .spec-table th{background:#444;color:#fff;text-transform:uppercase;font-family:”Bai Jamjuree”,Arial,sans-serif;font-weight:700;font-size:11px;padding:8px 6px;border:1px solid #ddd;text-align:center;line-height:1.15;white-space:normal;overflow-wrap:anywhere;word-break:normal} .spec-table td{padding:6px;border:1px solid #eee;text-align:center;line-height:1.15;white-space:normal;overflow-wrap:anywhere;word-break:normal} .spec-table .long-text{white-space:normal} .spec-table tbody tr:nth-child(even){background:#f7f7f7} .spec-table tbody tr:hover{background:#e5e5e5} .spec-table a{color:#0066cc;text-decoration:none;font-weight:600;background:transparent;padding:0;border-radius:0;box-shadow:none} .spec-table a:hover{text-decoration:underline} .group-row td{background:#444;color:#fff;font-family:”Bai Jamjuree”,Arial,sans-serif;font-weight:700;text-transform:uppercase;text-align:left} @media(max-width:640px){.spec-accordion,.spec-table-wrapper,.spec-table{width:100%;max-width:100%}.spec-accordion-toggle{font-size:14px;padding:13px 48px}} .spec-accordion.is-mobile-table .spec-table-wrapper{overflow-x:visible!important;overflow-y:visible} .spec-accordion.is-mobile-table .spec-table{width:100%;max-width:100%;min-width:0!important;border:0} .spec-accordion.is-mobile-table .spec-table thead{display:none!important} .spec-accordion.is-mobile-table .spec-table,.spec-accordion.is-mobile-table .spec-table tbody,.spec-accordion.is-mobile-table .spec-table tr,.spec-accordion.is-mobile-table .spec-table td{display:block;width:100%} .spec-accordion.is-mobile-table .spec-table tr{margin-bottom:14px;border:1px solid #ddd;background:#fff} .spec-accordion.is-mobile-table .spec-table tbody tr:nth-child(even),.spec-accordion.is-mobile-table .spec-table tbody tr:hover{background:#fff} .spec-accordion.is-mobile-table .spec-table th,.spec-accordion.is-mobile-table .spec-table td{white-space:normal!important} .spec-accordion.is-mobile-table .spec-table td{display:flex;justify-content:space-between;gap:14px;text-align:right;border:0;border-bottom:1px solid #eee;padding:10px 12px;font-size:13px;word-break:break-word} .spec-accordion.is-mobile-table .spec-table td::before{content:attr(data-label);font-weight:700;text-transform:uppercase;color:#444;text-align:left;flex:0 0 46%} .spec-accordion.is-mobile-table .spec-table td>a{word-break:break-word;background:transparent} .spec-accordion.is-mobile-table .group-row td{text-align:center;background:#444;color:#fff} .spec-accordion.is-mobile-table .group-row td::before{content:none} Available Variations and SpecificationsSKUMountSpindle TypeRPM at Max HPFree SpeedTorque StallWeightGear RatioLengthHorsepowerAir ConsumptionControl(RPM)(RPM)Ft-Lb | NmLbKgin | mmHp | kW(SCFM)A8R336MFace Mounting1 3/8 in Keyed Spindle3875638.0 | 8655123.133.6-120.63 | 5242.7112ReversibleA8R338MFace Mounting1 3/8 in Keyed Spindle65125385.0 | 5225123.120.3-120.63 | 5242.7112ReversibleA8R337MFace Mounting1 3/8 in Keyed Spindle109215226.0 | 3065123.111.9-120.63 | 5242.7112ReversibleA8R311MFace Mounting1 1/8 in Keyed Spindle225450110.0 | 1493817.25.8-117.5 | 4452.7112ReversibleA8R310MFace Mounting1 1/8 in Keyed Spindle37576564.0 | 873817.23.4-117.5 | 4452.7112ReversibleA8R309MFace Mounting1 1/8 in Keyed Spindle1300260019.0 | 263817.21-117.5 | 4452.7112Reversible (function(){ function initSpecAccordions(){ document.querySelectorAll(“.spec-accordion”).forEach(function(a){ if(a.dataset.specAccordionInit===”true”)return;a.dataset.specAccordionInit=”true”; var b=a.querySelector(“.spec-accordion-toggle”),p=a.querySelector(“.spec-accordion-panel”);if(!b||!p)return; var u=false; function m(){return(a.getBoundingClientRect().width||window.innerWidth)
-99%
