MRO Magazine

Shaft collars


September 20, 2010
By PEM Magazine

RotoPrecision now offers a full range of Ruland shaft collars with controlled face tolerance and high holding power. Shaft collars can be used on a variety of equipment including motors, gearboxes, linear actuators, packaging equipment, printing presses, medical devices, and precision instruments.

Ruland shaft collars are single point faced during the boring process to ensure a high level of face to bore perpendicularity. This results in a face runout of TIR < .05mm (.002”) on standard collars with even tighter tolerances on bearing locknuts and special designs. The face to bore relationship is important for many applications where components such as bearings need to be properly aligned on the shaft. It also creates even pressure on the interfaced components prolonging their life and reduces the likelihood that the shaft collar will shift when it is subject to shock loads. A circular groove on the shaft collar indicates that it has been single point faced. Ruland collars should be installed so that the circular groove is on the side that will receive the shock load or against the components that need precise positioning or even pressure.

Ruland shaft collars are offered in aluminum, black oxide carbon steel, stainless steel, and engineered plastic. One and two-piece clamp shaft collars are available with bore sizes from 3mm to 80mm in the metric series and from 1/8" to 6" in the inch series. Clamp style shaft collars wrap around the shaft for even distribution of clamping forces. This results in a tight fit and greater holding power, without the shaft damage caused by set screws. Two-piece clamp style collars have an additional advantage since they can be installed on the shaft without removing other components. Ruland uses forged socket hardware in all its shaft collars, which allows for higher screw torque and increased holding power.