Double Split Shaft Collars

What Are Double Split Shaft Collars?

Double split shaft collars are a type of shaft collar that is split twice on opposing sides. Each side is held together with a socket cap screw that is integrated into the collar assembly. Unlike their single and set collar counterparts, the double split design of these collars allows for more even holding power and more reliable clamping force, making these components an ideal choice for rotating assemblies like power transmission applications. They are often used as mechanical stops, bearing faces, and shaft protectors.

Double split shaft collars can be installed either axially or radially and excel in applications with shaft movement and axial load resistance, or where frequent adjustments are required. The two-piece design of the clamping collars provides uniform pressure distribution to reduce the risk of shaft damage and distortion to the shaft. In contrast to set collars, which require precise axial positioning, double split collars can be easily repositioned without disassembly, simplifying maintenance and adjustments.

Application Considerations

Before implementing double split collars into your application, consider the following factors:

Shaft Material: Ensure the collar material is compatible with the shaft material to prevent corrosion.
Shaft Size and Tolerance: Accurate measurements and proper shaft tolerances are essential to make sure the collar will not slip or disengage once in use.
Application Environment: Assess the application setting for moisture levels, weather and/or chemical exposure, or dirt and debris. These factors may impact the shaft's performance without the correct material or finish.
Load and Torque Requirements: Determine the load and torque forces the collar will endure.
Frequency of Adjustment: Evaluate whether frequent repositioning is necessary and if the application space allows for screw adjustments.

Product Benefits

Utilizing double split shaft collars offers several advantages, including:

Enhanced Clamping Force: Since the collar is clamped on both sides, the two-piece design provides a secure grip on the shaft that reduces slippage.
Easy Installation: The only tool required to install these collars is a hex key for the socket cap screws. The process is simple; disconnect the two-piece component, place it on the shaft, and reconnect it at the correct position.
Reduced Shaft Damage: Uniform pressure distribution minimizes shaft distortion.
Versatility: This collar assembly is simple, adjustable, and generally reusable, making it a cost-effective and versatile component for appropriate applications.
Durability: Available in a range of materials - including aluminum, low carbon steel, nylon, and stainless steel - and a selection of finishes - black oxide, plain, and zinc clear - double split shaft collars are durable fasteners that can withstand general wear and tear if used appropriately.

Difference Between a Single Split (one-piece) and Double Split (two-piece) Shaft Collar

As the name suggests, single split shaft collars are split on one side, while double split collars are split on both sides. Each works well for different application needs.

Single split collars are well suited for non-rotating assemblies and do not completely break apart, making it easier to keep track of the entire component. However, they can only be installed axially and offer less uniform holding power.

Double split collars work well in rotating assemblies, offer better holding power, and can be installed both radially and axially. However, it is easier to lose components during installation, as the two-piece design breaks completely apart.

Are Double Split Shaft Collars Reusable?

Generally, yes. However, it is important to evaluate several elements before deciding to reuse one. Look for:

Stripped threads or screw heads
Significant wear and tear
Signs of over-tightening

If any of these elements don't meet your performance requirements, you may need to replace the mating screws or retire the collar.

Different Types of Shaft Collars

Huyett offers four different types of shaft collars.

Set Screw Collars: Solid circle with a set screw protruding into the internal diameter to secure the collar
Single Split Collars: Split on one side of the circle and tightened with an integrated socket cap screw
Double Split Collars: Split on both sides of the circle and tightened like a single split collar
Threaded Collars: Single or double split with internal threads for precise shaft positioning