Regal Rexnord
Rigid Couplings
Regal Rexnord rigid couplings are simple, compact, and economical shaft - connection components designed to join two shafts into a single continuous rotating element when the application demands zero flexibility, absolute torsional rigidity, and the ability to transmit torque without any angular or parallel compliance.Available in one - piece sleeve configurations, two - piece split - clamp designs, and compression - style(pinch - hub) types, these couplings are used wherever the connected equipment can be precisely aligned and will maintain that alignment through all operating conditions — vertical pump motor - to - shaft connections, line - shaft extensions, encoder and resolver drives, and low - torque auxiliary drives where the simplicity and low cost of a rigid coupling justify its use.Under the Browning and Rexnord brands, our rigid coupling line includes steel, stainless - steel, aluminum, and engineered - plastic materials in bore sizes from under ¼ inch to over 4 inches.Plant maintenance storerooms and OEM assembly lines choose Regal Rexnord rigid couplings for their availability, interchangeability, and the speed with which they can be installed — typically a single setscrew or clamp - bolt tightening operation per shaft — making them the most straightforward shaft - connection solution for the many applications where flexibility is neither required nor desired.
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Absolute Torsional Rigidity
Zero wind - up, zero backlash, and 100 % torque transmission without any rotational compliance — essential for encoder feedback, phase - timing, and precision - indexing applications.
Simplest Possible Coupling Configuration
One - piece sleeve or two - piece clamp design with no moving parts, no lubrication, no wear elements, and nothing to maintain — installed once and forgotten.
Split - Clamp Design for In - Line Installation
Two - piece designs allow coupling installation without moving the connected equipment shafts — a significant time - saver on already - assembled machines and field retrofits.
Corrosion - Resistant Material Options
Stainless - steel rigid couplings for washdown, marine, and chemical environments; aluminum for lightweight, low - inertia applications; engineered polymers for electrical isolation.
Precision Bored & Keyseated
Standard and custom bore diameters with machined keyways and setscrew flats, providing drop -in compatibility with standard NEMA and IEC motor shaft dimensions.
Cost - Effective for Low - Torque and Auxiliary Drives
When the application does not require the misalignment accommodation of a flexible coupling, rigid couplings provide the lowest purchase and installation cost of any coupling type.
Rigid Coupling Selection: Appropriate Applications and Critical Limitations
Rigid couplings are the correct choice for a well - defined set of applications: machines that share a common, rigid baseplate or are registered to each other by pilot fits on their housings; vertical - shaft machines where gravity assists in maintaining alignment; and applications where the coupling serves as a simple shaft extension or splice rather than a misalignment - accommodating device.However, the use of rigid couplings in applications with even minor misalignment — whether from assembly tolerance stack - up, thermal growth, or foundation settling — imposes high radial loads on the shaft bearings of both the driver and driven machines, dramatically reducing bearing life and potentially causing catastrophic shaft or bearing failure.The rule is simple: if you cannot guarantee near - perfect, sustained alignment between the two shafts, choose a flexible coupling.Regal Rexnord application engineers help customers evaluate the alignment stability of their specific machine configuration and recommend the appropriate coupling flexibility class — rigid, single - flex, or double - flex — to ensure reliable operation without over - engineering cost.
Rigid Couplings for Precision Feedback Drives
In motion - control and instrumentation applications — encoder and resolver drives, tachometer connections, and stepper - motor lead - screw couplings — the angular precision of the coupling directly impacts the accuracy of the measurement or the positioning.Any torsional wind - up or backlash in the coupling introduces position error, degrades control - loop stability, and compromises the performance of the precision system.Regal Rexnord miniature rigid couplings and zero - backlash bellows couplings are designed specifically for these applications, offering the torsional rigidity and absence of lost motion that precision feedback and positioning systems demand.While flexible in the axial and angular axes(in the case of bellows couplings), these couplings maintain absolute torsional stiffness, ensuring that the measurement device sees exactly the shaft rotation that the sensor reports, without coupling - induced errors.For applications requiring straight - through shaft connection with maximum torsional fidelity, our precision rigid couplings in aluminum and stainless steel provide a zero - cost - of - flexibility coupling solution.