Round Bore Shaft Collars

Shaft collars are machine components featuring a simple design that consists of a round metal or plastic ring with a clamp screw and/or screws. Tightening the screws causes the ring to tighten or loosen around the shaft. When securely tightened, shaft collars can serve as mechanical stops or hold components in place along a shaft.

Despite their simple design, shaft collars play an important role in a wide range of industrial applications. As such, when choosing one for a particular application, it is essential to use the one with the right design and performance characteristics.

As an experienced manufacturer and distributor of shaft collars suitable for use in power transmission, motion control, automation, and other OEM and MRO operations, Stafford Manufacturing Corp. has the knowledge, skills, and inventory to help customers select and source the right shaft collar for their application. In addition to offering standard shaft collars, we also provide custom design and engineering services to manufacture specialized shaft collars for unique customer needs.

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Round Bore Shaft Collars

Types of Shaft Collars

Shaft collars provide three primary functions:

  • Holding components in place
  • Locating or positioning components on a shaft
  • Creating an attachment between shaft and another component

As they perform these functions in a wide variety of applications, manufacturers and distributors supply variations that differ in design, size, and material to suit a variety of uses. Some of the types commonly available include:

One-Piece Shaft Collars

One-piece shaft collars feature a simple design featuring a single screw. They work by surrounding the shaft with an evenly distributed compressive force. Since they cannot be disassembled, one-piece collars are only suitable for applications where the end of the shaft is accessible.

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One-Piece Shaft Collars

Two-Piece Shaft Collars

Unlike one-piece shaft collars, two-piece shaft collars can be completely disassembled, allowing them to be used in situations where the end of the shaft is not accessible. Two-piece collars also provide greater holding force and shock-load resistance relative to their one-piece counterparts as they can use their full seating torque to provide compressive forces around the shaft.

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Two-Piece Shaft Collars

Hinge Shaft Collars

Similar to the design of two-piece shaft collars, the design of hinge shaft collars allows for easy disassembly and reassembly along the shaft. They consist of a single unit that can be installed without the risk of dropping loose parts. As they can be installed quickly, hinge shaft collars are often the collar of choice when operating under strict time constraints or in harsh environments.

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Hinge Shaft Collars

Heavy-Duty Shaft Collars

Compared to other shaft collar designs, heavy-duty shaft collars feature larger clamping screws and greater outer diameters and widths. These qualities allow them to provide exceptional holding power. Increasing the outer diameter or width of the collar enables them to make use of the extra torque produced by bigger screws. The torsional holding capacity of heavy-duty collars is approximately twice that of standard collars.

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Heavy-Duty Shaft Collars

    When used in power transmission, motion control, automation, and other OEM and MRO applications, shaft collars offer several benefits, including:

    Easy Installation

    Shaft collars are designed for easy installation and removal. Many of them can be installed without removing other shaft component and/or used in situations where the end of the shaft is inaccessible.

    Broad Versatility

    Available in a wide range of designs and materials (e.g., corrosion-resistant and heavy-duty materials), shaft collars can be manufactured to withstand a variety of environmental and operating conditions, including exposure to chemicals, oils, and high temperatures.

    High Customizability

    Shaft collars have a wide range of sizes, styles, and material options available, allowing them to be tailored to suit virtually any application.


    Shaft collars find application in numerous industrial equipment and systems, including in the following:

    Automation Machinery

    For precise automation operations, shaft collars play a number of roles, including serving as positioning and aligning bearings, gears, pulleys, and other motion components.

    Trucks & Off-Road Vehicles

    In trucks & off-road vehicles, shaft collars act as mechanical stops for cylinders, actuators, and other components.

    Laboratory Equipment

    In laboratory equipment such as clamps and frames, shaft collars serve as precise and easy-to-adjust stops and spacers. They can also be used on glass, plastic, and thin-wall tubing.

    Medical Equipment

    Shaft collars with precise face-to-bore mating characteristics satisfy the strict design requirements of medical equipment. They are used as guides, stops, and spacers in everything from adjustable hospital beds to the positioning systems of MRI and CT machines.

    Optical Components

    Shaft collars are often used in optical measuring instruments and components to facilitate precise positioning and fine-tuning capabilities.

    Power Transmission Components

    In power transmission operations, shaft collars facilitate the positioning of motor and gearbox assembly components.

Why Choose Stafford Manufacturing For Your Shaft Collar Needs?

Founded in 1975, Stafford Manufacturing has since developed a reputation for quality products and superior customer service. We manufacture and distribute standard and custom shaft collars that can accommodate the requirements and restrictions of virtually any industrial or consumer application. Our extensive selection of shaft collar options include numerous design (e.g., one-piece, two-piece, and threaded), material (e.g., metal and plastic), and finishing (e.g., black oxide and chrome plating) choices. For round bore shaft collars alone, we offer 78 different options.

As a testament to our commitment to our customers, we continuously work to expand our product offerings to better serve their needs. Recently, we released a new line of stackable stainless steel shaft collars for mounting and stacking shafts, tubing, and hosing. These collars are stackable at 90-degree angles and capable of tolerating vibrations and thermal shock.

By partnering with us of their shaft collar needs, customers benefit from our:

  • Over five decades of experience manufacturing and distributing shaft collars
  • Broad selection of shaft collars with numerous design, material, and finishing options
  • Custom manufacturing capabilities—including CAD design and engineering—that allow us to design and deliver a shaft collar custom-tailored to a customer’s unique needs
  • Compliance with ASA/ASME/ANSI B18.3, RoHS, REACH, and ISO: 9001:2015 standards

Some of the industries that have come to rely on our shaft collars include:

  • Assembly/automation
  • Truck & off-road vehicles
  • Packaging equipment
  • Conveyor systems
  • Mining
  • Mixing equipment
  • Robotics
  • Military
  • Agricultural equipment
  • Food and beverage processing
  • Laboratory/research
  • Machine tools
  • Marine
  • Medical
  • MRO
  • Oil and gas/harsh environments
  • Optical
  • Power transmission
  • Retail display systems

Contact Stafford Manufacturing Today

Despite featuring a simple design, shaft collars often perform functions critical to the operations of systems. Ensuring these components work as intended necessitates choosing ones with the appropriate design, size, material, and performance characteristics for the application.

At Stafford Manufacturing, our over 50 years of industry experience, combined with our extensive range of product offerings, allows us to guide customers through the selection process to identify the shaft collar best-suited for their needs. If required, our design and engineering team can also work with them one-on-one to manufacture custom-tailored shaft collars.

For additional information about our standard and custom shaft collar offerings, contact us or request a quote today.

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