When a pneumatic drive system needs moderate speed with controlled torque, the Cleco B4R318M Reversible Axial Piston Air Motor delivers 0.9 HP output at 525 RPM free speed. This makes it useful for machinery, fixtures, and powered equipment where a slower, torque-capable air motor is a better fit than a high-speed direct-drive unit. Its 40 ft-lbs of stall torque provides the turning force available when the shaft stops under load, helping the motor start, hold, or push through resistance in properly matched applications.The B4R318M belongs to Clecos B4 Series axial piston air motor family and features reversible operation, which allows forward and reverse rotation when connected to the correct directional control valve. The rear exhaust routes spent air away from the front drive interface, while the 7/8″ keyed spindle provides a positive mechanical connection for compatible couplings, sprockets, pulleys, or custom machine components. With an 8:1 gear ratio and 270 RPM at maximum horsepower, this model balances usable torque with faster output than the lower-speed B4 Series reductions.Type: Reversible Axial Piston Air Motor | Series: B4 Series | Model: B4R318M | Power: 0.9 HP | Power: 0.67 kW | Free Speed: 525 RPM | RPM at Max HP: 270 RPM | Stall Torque: 40 ft-lbs | Torque Range: 4232 ft-lbs | Gear Ratio: 8:1 | Air Consumption: 39.9 SCFM | Air Inlet: 3/8″ NPTF | Spindle Type: Keyed | Spindle Size: 7/8″ | Control: Reversible | Exhaust: Rear | Mount: C-Face Mounting | Length: 13.19″Features:Axial piston air motor construction provides torque-focused pneumatic power for machinery and fixture integration.Reversible operation supports forward and reverse rotation when used with the proper pneumatic control circuit.Rear exhaust helps direct discharge air away from the driven component and front mounting area.7/8″ keyed spindle provides a positive drive interface for compatible couplings, pulleys, sprockets, or custom mechanical connections.8:1 gear ratio reduces motor speed while increasing usable output torque for controlled rotary motion.C-face mounting supports installation into machine frames, drive assemblies, and custom equipment layouts.Air-powered operation allows variable speed control and stall tolerance when the motor is properly supplied, lubricated, and applied within its rating.Made in USA: Applications:Machine building and automation adding reversible pneumatic rotary motion to fixtures, indexing devices, and specialty equipment.Industrial maintenance and MRO replacing or supporting existing air motor drives where the speed, torque, spindle, and mounting match the machine.Conveyor and handling equipment powering controlled movement in compatible transfer, positioning, or material handling systems.Packaging and production machinery driving moderate-speed mechanisms where pneumatic control and stall tolerance are useful.Tooling and test fixtures supplying forward and reverse motion for clamps, rotating nests, and custom pneumatic mechanisms.FAQs:Q: What does the 40 ft-lbs stall torque rating mean?A: Stall torque is the maximum torque the motor can develop when the output shaft is stopped under load. For the B4R318M, the 40 ft-lbs rating helps buyers compare its low-speed force against other B4 Series models.Q: Is the Cleco B4R318M reversible?A: Yes. This model is reversible, meaning it can run in forward or reverse when installed with the correct directional air valve and control arrangement.Q: How much air does this motor require?A: The listed air consumption is 39.9 SCFM. The compressor, hose, fittings, and FRL should be sized to maintain adequate flow during the actual duty cycle, especially in continuous or shared-air systems.Q: What is the difference between free speed and RPM at maximum horsepower?A: Free speed is the unloaded shaft speed, listed here as 525 RPM. RPM at maximum horsepower is the loaded operating point where the motor produces its rated power output, listed here as 270 RPM.Q: Can this air motor be used instead of an electric motor?A: It may be suitable when the required speed, torque, mounting, spindle, air supply, and control method match the machine. A qualified technician should confirm load conditions, guarding, valve selection, and lubrication before installation. .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)B4R317MFace Mounting7/8 in Keyed Spindle4690232.0 | 31522.510.246.4-115.21 | 3860.939.9ReversibleB4R322MFace Mounting7/8 in Keyed Spindle79150136.0 | 18422.510.227.2-115.21 | 3860.939.9ReversibleB4R323MFace MountingDiscontinued90175119.0 | 16122.510.223.8-115.21 | 3860.939.9ReversibleB4R320MFace Mounting7/8 in Keyed Spindle15430070.0 | 9522.510.213.9-115.21 | 3860.939.9ReversibleB4R318MFace Mounting7/8 in Keyed Spindle27052540.0 | 5414.56.68-113.19 | 3350.939.9ReversibleB4R319MFace Mounting7/8 in Keyed Spindle525102021.0 | 2814.56.64.1-113.19 | 3350.939.9ReversibleB4R321MFace MountingDiscontinued215042005.0 | 6.814.56.61-113.19 | 3350.939.9Reversible (function(){ function initSpecAccordions(){ document.querySelectorAll(“.spec-accordion”).forEach(function(a){ if(a.dataset.specAccordionInit===”true”)return;a.dataset.specAccordionInit=”true”; 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