Shaft Collars

Shaft collars, also known as locking collars or shaft clamps, are simple yet critical circular components that fit onto a shaft, playing an essential role in various industrial applications.

Despite their straightforward design, these metal or plastic components are among the most important machine elements in industry today. Collars are typically used for securing bearings and sprockets on a shaft, precisely locating components in motor and gearbox assemblies, or alternatively serving as a reliable mechanical stop.

Types of Shaft Collars

Shaft collars are categorised primarily by their fastening mechanism, offering different advantages for various applications.

Set Screw Shaft Collars

Set screw collars attach to a shaft by tightening screws that bite directly into the shaft's surface. They are most effective when the shaft material is softer than the screws, providing impressive holding power and high torque capacities.

Clamp Shaft Collars

Clamping collars secure onto a shaft using a compression method, locking it firmly into place without marring the shaft. This type offers several benefits over set screw versions, being easier to fit and causing no damage.

One-Piece Clamp

One-piece clamp shaft collars are solid rings that tighten onto the shaft using a screw clamp. They are ideal for applications where the collar can be slid over the end of the shaft and can also be used in split hub applications.

Two-Piece Clamp

Two-piece clamp shaft collars consist of two halves that can be fastened together around the shaft. They offer the same benefits as one-piece clamps but provide added convenience for installation, especially when it's difficult or impossible to access the end of the shaft. This design simplifies assembly and disassembly.

Hinged Shaft Collars

Hinged shaft collars feature a unique design with a hinge on one side and a clamping screw on the other. This allows them to be opened and wrapped around a shaft without needing to slide them over the end. They are particularly useful for applications where components are already installed on the shaft, providing easy retrofitting and adjustment without disassembling other parts.

Factors to Consider When Choosing the Right Shaft Collar

Selecting the ideal shaft collar requires careful consideration of several factors to ensure optimal performance and compatibility with your application.

• Design Type: Choose based on application needs. Set screws offer strong holding power for softer shafts but can cause damage. Clamp styles provide even compression without shaft damage and come in one-piece or two-piece designs. Hinged collars allow for easy installation or removal without disassembling the shaft.
• Material: The material impacts strength, corrosion resistance, and weight. Steel offers high strength for demanding loads. Stainless steel provides excellent corrosion resistance, ideal for harsh or sterile environments. Aluminum is lightweight and non-magnetic, suitable for moderate loads and specific environmental needs.
• Size (Bore Diameter, Outer Diameter, Width): Ensure precise fit by matching the collar's bore diameter to the shaft's diameter. The outer diameter and width should be considered for space constraints within the assembly. A correct fit is crucial for reliable holding power and proper component location.

Applications of Shaft Clamps

Shaft clamps, or shaft collars, are incredibly versatile components used across numerous industries in NZ for their ability to securely fix and position elements on a rotating shaft.

• Positioning Components: They are widely used to precisely locate gears, sprockets, pulleys, and other components on a shaft.
• Bearing Retention: Shaft clamps effectively secure bearings on a shaft, preventing axial movement and ensuring the bearing remains in its intended position.
• Mounting Devices: They provide a simple yet robust method for mounting sensors, limit switches, and other devices onto a shaft.
• Mechanical Stops: Used as reliable mechanical stops, they prevent components from moving beyond a defined point along the shaft.
• Spacer Devices: Shaft collars can function as spacers to maintain a precise distance between components on a shaft.
• Torque Transfer: Certain heavy-duty clamp collars can be used in light-duty applications to transfer torque, especially when combined with a keyway or D-bore. For dedicated and precise torque transfer, however, components like timing belts are significantly more efficient and reliable.
• Vibration Dampening: In some applications, the material and design of shaft collars can contribute to dampening minor vibrations along the shaft.
• Safety Applications: They are often incorporated into safety mechanisms to prevent unintended movement of machine parts or to secure covers and guards.

Browse Our Wide Range of Shaft Collars

RS NZ is your trusted supplier and distributor of a comprehensive range of high-quality shaft collars from leading brands like Ruland, Huco, and our own RS PRO. Our selection prioritises precision engineering, durable materials, and adherence to industry standards. Explore our extensive online catalog to find the perfect shaft collar, timing belt, or V drive belt for your needs.

To place an order with RS NZ, simply browse our extensive online catalogue, select your desired shaft collars, and proceed to our secure checkout. We offer a variety of payment options for your convenience.

For detailed information, including estimated delivery times and associated costs within New Zealand, please visit our dedicated Delivery Information page.