Ruland 12.7 mm OD, 6.35 mm Bore Set Screw Style Aluminium Coupler OST8-4-A

Ruland OST8-4-A is a high-precision aluminium set screw style coupler designed for flexible mechanical power transmission and shaft coupling systems. Featuring a 12.7 mm outside diameter and a 6.35 mm bore diameter, it provides compatibility with a wide range of shafts and machinery setups.

The hub length of 5.64 mm allows for compact integration in assemblies requiring precise and secure shaft connections. The coupler is finished with no keyway bore to accommodate flexible coupling needs without keyways, facilitating easier installation and removal.

This product supports rotational speeds up to 4500 rpm, suitable for light industrial and motion control applications such as automation equipment, robotics, and servo or stepper motor driven systems. It also allows for minor misalignments, including 0.5° angular, 0.1 mm parallel, and 0.1 mm axial misalignment, enabling it to protect machinery and increase operational life.

The set screw style securing method ensures a strong and dependable shaft connection, with hubs manufactured from anodised aluminium to provide corrosion resistance and weight savings. Oldham couplings of this style require two hubs and one torque disc for a complete assembly; torque discs are replaceable and designed to act as torque limiters protecting machinery from overload.

This coupler complies with REACH and RoHS environmental standards, emphasizing safety and ecological responsibility. Originating from the United States, it combines quality manufacturing with reliable performance. It is ideal for industrial, laboratory, mechanical power transmission, and manufacturing environments requiring robust and precise shaft coupling components.

Constructed from anodised aluminium for lightweight durability. Bore finished with no keyway bore suitable for flexible shaft connections. Hub length 5.64 mm for compact assembly integration. Supports up to 4500 rpm maximum speed.

Accommodates angular, parallel, and axial misalignment. Set screw securing style ensuring reliable fastening. Part of a 3-piece Oldham coupling assembly requiring two hubs and one torque disc. Complies with REACH and RoHS environmental standards.

Manufactured in the United States ensuring quality and precision. Browse the Mechanical Power Transmission Couplers category on EnvMart for more Ruland coupling solutions and accessories.