Regal Rexnord
Gear Couplings
Regal Rexnord gear couplings are high - torque - density flexible shaft connections that transmit power through the meshing of external crowned gear teeth on the hubs with internal straight gear teeth in the coupling sleeves — providing a mechanically robust, relatively compact coupling capable of accommodating angular, parallel, and axial misalignment through the rocking and sliding action of the gear teeth.As one of the most established and widely applied flexible - coupling technologies, gear couplings are the default specification for a vast range of industrial rotating equipment: steel - mill runout tables, paper - machine line shafts, crane bridge and trolley drives, pump and compressor trains, and marine propulsion drivelines where the combination of high torque, moderate misalignment, and proven reliability is essential.Under the Ameridrive, Euroflex, and Rexnord brands, our gear coupling portfolio spans standard AGMA bore sizes from under 1 inch to over 24 inches, torque capacities to millions of pound - feet, and specialized configurations including spacer, floating - shaft, shear - pin, insulated, and vertical designs.Reliability engineers select Regal Rexnord gear couplings for their tolerance of installation imperfection, their ability to be inspected and relubricated in service, and their availability in virtually any bore, length, and torque configuration required by existing or new equipment designs.
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Trusted by Industry Leaders
Industry - Highest Torque Density
Crowned gear - tooth contact geometry packs more torque capacity per unit diameter than any other flexible - coupling technology — often the only viable choice for high - torque applications with space constraints.
Generous Misalignment Accommodation
Standard designs accept 1° to 1.5° angular misalignment per gear mesh(2° to 3° total for double - engagement designs), substantially more than disc couplings and sufficient for all but the most severe shaft - offset installations.
Double - Engagement Spacer Configurations
Floating - shaft and spacer gear couplings that accommodate significant parallel offset between widely separated machines — standard in paper - machine line - shaft and steel - mill main - drive applications.
AGMA & API Standard Compliance
Fully interchangeable with gear couplings manufactured to AGMA 516 and API 671 dimensional standards, enabling competitive sourcing and straightforward replacement of legacy installations.
Flexible Hub Configurations
Solid, interference - fit, keyless(shrink - disc), and mill - motor(tapered - shaft) hub designs that match every standard shaft - end configuration in use across global industry.
Service - Tested Lubrication & Seal Systems
Gear couplings designs with o - ring - sealed, grease - retaining covers and the option for continuous oil - lubrication systems that dramatically extend service life in high - speed, continuous - operation applications.
Gear Coupling Lubrication: The Key to Long Service Life
The sliding motion between crowned gear teeth and the sleeve under misalignment produces an elastohydrodynamic lubrication regime that demands a lubricant specifically formulated for coupling service — high - viscosity, centrifugally stable, extreme - pressure(EP) grease that resists separation and leakage at operating speed.Using general - purpose bearing grease in a gear coupling is a leading cause of premature coupling failure: centrifugal forces rapidly separate the base oil from the thickener, leaving a dry soap residue that accelerates tooth wear.Regal Rexnord specifies NLGI #1 or #2 coupling greases with a minimum base - oil viscosity of 400 cSt at 40°C and EP additives for the boundary - lubrication conditions that occur during startup and shutdown.For high - speed couplings operating above 3, 600 RPM, continuous oil - lubrication systems with filtered, cooled oil are recommended and can extend coupling service life from years to decades.Regal Rexnord’s coupling service kits include the recommended lubricant quantity, seal o - rings, and fasteners for each coupling service interval, removing the guesswork from coupling maintenance and ensuring the repeatable results that sustain high reliability.
Gear Couplings for Steel Mills, Paper Machines & Heavy Industry
Regal Rexnord gear couplings have earned their reputation for reliability in the world’s toughest industrial environments.Steel - mill runout tables subject couplings to water spray, mill scale, and rapid temperature changes that test seal integrity and lubricant performance.Ameridrive gear couplings with high - temperature seals and synthetic coupling grease meet this challenge, providing the reliability that keeps red - hot strip moving from the finishing mill to the downcoiler without interruption.Paper machines, with their long line - shaft drives spanning hundreds of feet through multiple dryer sections, rely on our spacer gear couplings to transmit power while accommodating the thermal growth of the shafting as it transitions from ambient to steam - heated operating temperature.Crane wheel drives and trolley traverses in port, shipyard, and steel - mill overhead cranes utilize gear couplings that tolerate the structural deflection and wheel - wear alignment changes inherent in heavy lifting equipment that operates 24 / 7 in corrosive, dirty environments.For each of these applications, Regal Rexnord delivers not just a coupling part number but an engineered reliability solution that has been proven across thousands of installations worldwide.