RULAND Rigid Couplings

RULAND Rigid Couplings

TRADELINK SERVICES now offers RULAND Rigid shaft couplings in one and two-piece designs, with and without keyways, in aluminum, carbon steel, and stainless steel. A large number of standard sizes are available in straight and step bore combinations to fit shafts ranging from 1/8" to 2" in the inch series and from 3mm to 50mm in the metric series. (see below)

The one-piece rigid coupling wraps around the shaft, providing high torsional holding power without damage to the shaft or fretting. The two-piece rigid coupling has the additional benefit of easy fitment, without disturbing other components – apart from easy dynamic balancing.

Shaft Collar

Ruland manufactures shaft collars in multiple styles to fit shafts ranging 1/8" to 6" in the inch series and 3mm to 150mm in the metric series. Ruland shaft collars are available in a variety of materials and finishes including: 303 & 316 stainless steel, black oxide and yellow zinc plated carbon steel, high-strength aluminum, and engineered plastic.

One Piece Steel

One Piece Stainless Steel

Two Piece Steel

Two Piece Stainless Steel

Double Wide Shaft Collar - One Piece SS

Double Wide Shaft Collar - Two Piece Steel

Quick Clamping Shaft Collar

Quick clamping shaft collars from Ruland are designed to deliver speed and flexibility while reducing down time. They have an integral handle that sits flush with the outside diameter when fully installed and can be actuated without tools, allowing for quick installation and adjustments. Quick clamps are ideal for light duty rotating and stationary applications in industries such as printing, packaging, semiconductor, and medical where frequent change outs of items including media, guide rails or other setup fixturing is required.

          Quick Clamping Collar

Rigid Coupling

All bores in the Ruland rigid couplings are precision honed, enhancing the overall performance of the coupling, resulting in a round, precisely sized bore. This also helps in increase area of shaft contact and higher transmission capacity.

Rigid couplings come with Ruland's unique Nypatch® socket head cap screws for increased performance and reliability. Nypatch® is a proprietary process that involves depositing a 360 degree coating of Nylon on several threads of the socket head cap screws. This coating is designed to reduce screw vibration, during the course of normal use.

One Piece Rigid Coupling with Keyway

One Piece SS Coupling

Two Piece Rigid Coupling

The benefits of using rigid shaft couplings include their economy, high torque capacity, and zero backlash. Rigid couplings are suitable for applications when misalignment is neither present nor desired, including connecting line-shafting or instances where 2 shafts are to be coupled, without the necessity of flexibility.. Rigid couplings are increasingly used in precision motion control applications where components are properly aligned.

      Two Piece Rigid Coupling SS

Oldham Coupling


Oldham couplings are a 3 piece design comprising of two aluminum hubs press fit onto a center disk. Torque transmission is accomplished by mating the slots on the center disk to the drive tenons on the hubs. During operation the center disk slides on the tenons of each hub (which are oriented at 90° apart) to transmit torque. While the couplings accommodate a small amount of angular and axial misalignment, they are especially useful in applications with parallel misalignment.

Ideal for many light duty industrial and motion control applications, Oldham couplings have the ability to protect more expensive machinery components. For example the Oldham coupling acts as a torque limiter during overload. When the disk fails, it breaks cleanly and does not allow any transmission of power. Oldham couplings also have the advantage of electrical isolation due to the non-conductive nature of the center disk. This prevents electrical currents from being passed to delicate instruments which can cause inaccurate data readings or damage.

We are committed to have the largest variety of sizes and styles in the industry. In addition to the items mentioned above, we can supply an extensive variety of special designs. Please contact us with your custom needs.