Regal Rexnord
Chain Couplings
Regal Rexnord chain couplings are cost - effective, high - torque - capacity flexible shaft connections that use a standard double - roller or silent chain wrapped around two hardened sprocket hubs to transmit power between rotating shafts.Engineered for applications requiring simple, field - serviceable coupling designs that tolerate moderate misalignment while delivering excellent torque density per dollar, these couplings are the workhorse choice for general industrial drives — pumps, fans, compressors, mixers, and bulk - material conveyors across manufacturing, water treatment, agriculture, and aggregate processing.Maintenance technicians value chain couplings for their visual inspectability, the ability to replace the chain element without moving the connected equipment, and the inherent tolerance for both angular and parallel shaft misalignment that reduces installation precision requirements.Under the Rexnord and Link - Belt brands, our chain coupling line includes standard double - roller chain couplings, high - performance silent / inverted - tooth chain couplings for higher speeds and reduced backlash, stainless - steel and special - coating variants for corrosive environments, and spacer designs that accommodate standard pump and motor separation distances.With bore capacities from under ½ inch to over 7 inches, torque ratings to hundreds of thousands of pound - inches, and the fastest delivery lead times in the industry for made - to - bore configurations, Regal Rexnord chain couplings provide the reliability - per - dollar ratio that cost - conscious maintenance organizations demand.
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Interchangeable Chain Element
The coupling chain can be replaced without disturbing hub or machine alignment — a 15 - minute job that restores full coupling capacity at a fraction of the cost and downtime of a full coupling change - out.
Visual Wear - Inspection Capability
Cover removal provides immediate visual access to sprocket tooth and chain wear patterns, enabling condition - based replacement scheduling instead of unplanned failure response.
Double - Roller Chain Standardization
Utilizes standard ANSI roller chain sizes, allowing procurement from multiple sources in emergencies and leveraging competitive chain pricing to minimize spare - parts inventory cost.
Moderate Misalignment Accommodation
Standard designs accept up to 1° angular and 0.010" to 0.015" parallel misalignment per inch of hub separation, reducing the alignment precision requirements and installation time of connected equipment.
Quiet Silent Chain Option for Higher Speeds
Inverted - tooth(silent) chain designs provide reduced chordal - action vibration and noise compared to roller chains, enabling chain coupling use at motor speeds where standard roller chain couplings would exceed noise or vibration limits.
Corrosion - Resistant Material Choices
Stainless - steel hubs and chain with polymer covers for washdown, marine, and chemical - processing environments where standard carbon - steel couplings would require frequent replacement.
When to Choose Chain Couplings Over Gear or Elastomeric Couplings
Chain couplings occupy a distinct sweet spot in the coupling universe — offering higher torque density and misalignment capacity than elastomeric couplings at a lower cost than gear or disc couplings.For applications with shaft sizes from 1 to 4 inches, motor speeds under 1, 800 RPM, and moderate misalignment from typical industrial installation tolerances, chain couplings deliver the optimal combination of purchase cost, installation simplicity, and lifecycle maintainability.They are particularly advantageous in "balance-of-plant" applications — cooling - water pumps, induced - draft fans, belt - conveyor drives — where high engineering spend on premium couplings cannot be justified by the operating conditions, yet reliability must be maintained.The ability to inspect chain and sprocket wear visually without removing the coupling cover enables maintenance teams to plan replacements during scheduled outages rather than responding to failure.For operations that standardize on a small set of coupling types across hundreds of drive points, chain couplings provide the cost leverage, interchangeability, and technician familiarity that simplify maintenance management.
Chain Coupling Installation & Maintenance Best Practices
Achieving the full potential service life from chain couplings requires attention to a few key installation and maintenance details.A single - point failure of lubrication leads to rapid chain - wear elongation; Regal Rexnord recommends heavy - duty, high - adhesion, NLGI #1 or #2 grease with EP additives specifically formulated for coupling service — not general - purpose bearing grease.Cover seals should be inspected and replaced at every chain change to prevent grease loss and contamination ingress.Alignment should target the tighter end of the coupling’s tolerance range; while chain couplings are forgiving, operating at maximum allowed misalignment accelerates wear and reduces coupling life by approximately 50 % compared to near - perfect alignment.Regal Rexnord provides laser - alignment training and ready - to - install pre - lubricated chain coupling assemblies that eliminate the most common installation errors, ensuring that your maintenance team achieves reliable, long - life coupling performance from day one.