Reuland / Trilex Flexible Shaft Couplings — RC1–RC8

Construction & Performance

Reuland RC couplings pair lightweight aluminum hubs with hytrel flexible elements that absorb shock, dampen vibration, and accommodate minor shaft misalignment. This combination delivers reliable torque transmission while protecting connected equipment from damaging load spikes — making them a dependable choice across a wide range of drive applications.

Understanding the RC Part Number

Reuland RC coupling part numbers follow a consistent structure that makes it straightforward to specify the right half:

RCx — The coupling series (RC1 through RC8), which determines the overall physical size of the coupling half. RC1 is the smallest; RC8 is the largest.

-XXXX — Bore size in decimal inches (e.g., -0750 = 0.750" bore)

YYY — Keyway size in decimal inches (e.g., 187 = 0.187" keyway)

For example, an RC3-0750187 is an RC3-size coupling half bored to 0.750" with a 0.187" keyway. If you know your shaft diameter and keyway dimensions, you can identify your part number directly from our product listings.

Sizing & Selection

Select your RC series based on the physical size of coupling required for your application, then specify the bore and keyway to match your shaft. We stock a wide range of bore and keyway combinations across the RC1–RC8 series. If you don't see the exact combination you need, contact us — we can assist with sourcing or special orders.

Frequently Asked Questions

How do I read a Reuland RC flexible coupling part number?

RC coupling part numbers follow a three-part structure. The RC number (RC1 through RC8) indicates the physical size of the coupling half. Following a hyphen, the next four digits represent the bore diameter in decimal inches — for example, 0750 = 0.750". The final three digits represent the keyway size in decimal inches — for example, 187 = 0.187". So RC3-0750187 is an RC3 coupling half with a 0.750" bore and a 0.187" keyway.

What is a hytrel flexible element and when should it be replaced?

The hytrel element is the flexible insert that sits between the two aluminum coupling halves, transmitting torque while absorbing shock and accommodating minor shaft misalignment. Hytrel is a thermoplastic elastomer chosen for its flexibility, fatigue resistance, and durability across a wide temperature range. It is a wear component and should be inspected periodically and replaced when cracked, compressed, or showing visible deterioration.

Do I need to buy both coupling halves, or can I replace just one?

Each RC coupling half is an independent component and can be purchased and replaced individually. This is useful when one shaft end requires a different bore or keyway than the other, or when only one half is worn or damaged. Both halves in a set must be the same RC series number to ensure the flexible element fits correctly between them.

How do I select the correct RC series size?

RC series selection is based on the physical envelope available at the coupling location and the torque requirements of the application. In practice the series is most often determined by matching to an existing coupling or specifying based on shaft diameter and available space. Contact us with your shaft sizes, keyway dimensions, and application details and we'll help identify the appropriate series.

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Flexible Couplings