Ruland

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Ruland Manufacturing – Shaft Couplings and Shaft Collars

Ruland Manufacturing Co., Inc. has been a precision manufacturer since 1937. Over the years Ruland has made a variety of products including spring rings for the .50 caliber machine gun, clamp style shaft collars for guidance instruments and bombsights during World War II, and the valve that pressurized the spacesuit of the first American to walk in space.

For the past 40 years Ruland Manufacturing’s focus has been on high performance shaft collars and couplings. Ruland’s complete line of products include shaft collars, rigid couplings, and a variety of zero backlash motion control couplings: beam couplings, Oldham couplings, curved jaw couplings, bellows couplings, and disc couplings.

Product Groups


Shaft Collars

Ruland manufactures shaft collars in multiple styles to fit shafts ranging from 1/8″ to 6″ and 3mm to 150mm. They are made from select North American bar stock in 303 and 316 stainless steel, black oxide and zinc plated carbon steel, high-strength aluminum, and engineered plastic. Ruland shaft collars have precisely controlled face to bore perpendicularity (identified by the grooved face) TIR ≤ .002″ (.05mm) with tighter tolerances on bearing locknuts. Perpendicularity is critical for alignment when a shaft collar is used as a load-bearing face, mechanical stop, or for mounting components.


Rigid Couplings

Rigid shaft couplings are available with or without keyways in one- and two-piece and set screw designs. Ruland manufactures them from select North American bar stock in 2024 aluminum for lightweight and low inertia, 1215 lead-free steel for general purpose use, and 303 stainless steel for high corrosion resistance. Straight and step bore type rigid couplings are standard products for shafts ranging from 1/8″ to 2″ and 3mm to 50mm.


Beam Couplings

Ruland has three series of zero-backlash beam couplings in inch or metric dimensions with bores ranging from 3/32″ (3mm) to 3/4″ (20mm). Flexible beam couplings are machined from a single piece of material and feature multiple helical cuts. This design provides higher torque capabilities and reduced wind-up when compared to commodity type single beam couplings. They can accommodate all forms of misalignment and have a balanced design for reduced vibration at high RPM.


Bellows Couplings

Ruland bellows couplings are comprised of two anodized aluminum hubs and a stainless steel bellows. This design creates a low inertia zero-backlash coupling with long life properties. The thin wall of the bellows allows the coupling to remain flexible under misalignment conditions while maintaining rigidity under torsional loads. Bellows couplings can accommodate all forms of misalignment and have a balanced design for reduced vibration at high speeds up to 10,000 RPM. They are best suited for applications with limited misalignment where high torque and precise positioning are required.


Disc Couplings

Ruland manufactures disc couplings in single and double disc styles with bores in inch, metric, and inch to metric combinations ranging from 1/8” to 1-1/4” and 3mm to 32mm. They utilize thin stainless steel disc springs that allow for a substantial amount of shaft misalignment while remaining rigid under torsional loads. Hubs are manufactured from lightweight 2024 anodized aluminum for low inertia.


Jaw Couplings

Ruland zero-backlash jaw couplings and are a three-piece assembly with a balanced design comprised of two hubs and an elastomeric insert called a spider. Users can combine clamp and set screw hubs with inch, metric, keyed, and keyless bores in sizes ranging from 1/8” to 1-1/4” and 3mm to 32mm. The polyurethane spider dampens impulse loads, minimizing shock to the motor and other sensitive components.


Oldham Couplings

Ruland oldham couplings are a three-piece assembly with a balanced design comprised of two hubs and a center disk. This allows for a highly customizable coupling that allows the user to combine clamp and set screw hubs with inch, metric, keyed, and keyless bores in sizes ranging from 1/8” to 1-1/8” and 3mm to 30mm. Oldham couplings can accommodate small amounts of angular and axial misalignment and they are especially useful in parallel misalignment accommodating up to 10% of their OD in misalignment.

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