Due to Microsoft's discontinuation of updates, including security, certain functionality such as checkout and CAD may not work for you. We recommend using Google Chrome, Microsoft Edge, Firefox, or Safari to ensure full functionality.
Thank you - the Ruland team

Shaft Collar Types, Performances, and Design Considerations

Release Date : March 18, 2011

Shaft collars are versatile components that have evolved from the basic set-screw collar to the high performing one- and two piece clamp collars. This video explains the differences between shaft collars and wraps up with an axial load comparison test.

Transcript

Set Screw Shaft Collars: The set screw shaft collars derives its holding power from a single screw as it is tightened onto the shaft. To reach maximum holding power, the shaft must be a softer material than that of the screw. The very nature of the set screw collar is its greatest fault. And as a result, the tightening of the screw causes a deformation of the material around the point resulting in a raised burr on the surface of the shaft. The damage to the shaft makes it difficult to replace or re-position the collar. Removal may require the use of specialized equipment. Due to the shaft damage, I won’t be able to reinstall or re-position the collar without the replacement of the shaft. Here are some examples of shaft damage caused by set screw collars. This type of damage is caused by multiple adjustments of the collar. And this form of damage is caused by axial movement of the collar.

One-Piece Shaft Collars: One-piece clamp style shaft collar is an improvement of the set screw collar as they do not destroy the shaft. Unlike the set screw collar, the one-piece collar can be used on a split hub application such as this one. One-piece shaft collars utilize forged socket head cap screw and the use of a saw cut to achieve maximum clamping force. As you can see removing a clamp style collar is a lot easier than moving a set screw collar. The shaft is undamaged, and the collar can easily be repositioned.

Two-Piece Shaft Collars: two-piece shaft collars can be used when its difficult to install a one-piece shaft collar. They offer the same benefits as the one-piece collar with additional versatility and convenience. I can easily install a two-piece collar as a stop on a pillow block without removing any other components. This results in reduced labor costs and down time when adjustment, removal or replacement is necessary. Tightening the screws clamp the collar onto the shaft for uniform distribution of forces around the shaft circumference. To achieve the maximum holding power, the forged socket head cap screws must be tightened in an alternating pattern to maintain an even saw cut gap.

Shaft Collar Axial Load Test: The universal testing machine is a device used to test the tensile and compressive stress of materials, components and assemblies. For this demonstration, we are using the machine to apply compressive force to the shaft collar assembly to simulate an axial load. The force at which the collar begins to slip on the shaft is shown in the dial in pounds. As you can see, single and two-piece shaft collars offer greater axial holding capabilities as compared to the traditional set screw type collar.

Helpful Resources for Shaft Collars

Getting a Hold on Shaft Collars: Choosing the Correct Shaft Collar for the Job - Shaft collars are one of the most commonly used industrial components, however they are often misapplied. This article reviews how to properly select a shaft collar for your next application.

Choose a Shaft Collar - This page will shows you all the variety of Shaft Collars that Ruland offers.

Shaft Collar Comparison Guide - This is a chart that compares the various Ruland shaft collars on critical performance characteristics.

Axial Load Test Data - This page will show you axial load by screw size and product type based on our test data.

We Are Shaft Collars - Learn about why Ruland shaft collars have superior fit, finish, and holding power.

The Inside Story - Why do Ruland shaft collars look so nice? Why is run out important? Who invented shaft collars? What do a potato and shaft collar have in common? The Inside Story was originally written by our founder Fred F. Ruland in his unique voice and explains the A-Zs on Ruland shaft collars.

© 2024 Ruland Manufacturing Co., Inc. All rights reserved