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Custom Manufacturing • Beyond Standard

Engineering

Stafford’s engineering team partners with you from concept to finished part. Whether you need a modification to a standard shaft collar or coupling, or a fully custom component engineered to your exact specifications, our team delivers precision solutions backed by 50 years of manufacturing expertise.

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Clamp Collar & Clamp
Coupling Styles

Clamp-Type collars and rigid couplings effectively secure and position components along a machine’s shaft. Different styles are available to handle a particular application’s varied requirement for profile, material, and holding power, as well as a broad array of additional functionalities.

Choosing the ideal style is essential for reliable equipment performance. At Stafford Manufacturing Corp., our clamp-type collars and couplings come in a range of inch and metric sizes, material options, and configurations. We can also tailor a component to suit your specific needs.

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Materials and Finishes

The highlighted materials and finishes described below refer to the standard options offered on Stafford Manufacturing Corp. catalog products. Additional materials and finishes are available as Specials.

Over 95% of our sales are manufactured by Stafford, in our Massachusetts facility. Except as otherwise noted, all material and finish specifications refer to our US-made products.

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Weldability

At Stafford Manufacturing Corp., we produce premium quality shaft collars, rigid couplings, coupling adapters, and other mechanical components used in motion control, power transmission, mounting, and clamping applications. One of the common inquiries we receive from customers is regarding the weldability of our products. The following article discusses some basic things to consider when looking to weld your shaft collar or coupling.

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The Ultimate Resource for
Axial Holding Power

Axial holding power is more than just a specification—it is the foundation of secure, efficient motion control. In this comprehensive guide, we demystify the critical variables that influence performance, from surface preparation and material selection to the precise application of seating torque. Whether you are validating a design or troubleshooting a specific assembly, leverage our five decades of engineering data and technical expertise to achieve reliable, long-term performance in every application.

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Torsional Holding Power

Clamp-Type collars and rigid couplings effectively secure and position components along a machine’s shaft. Different styles are available to handle a particular application’s varied requirement for profile, material, and holding power, as well as a broad array of additional functionalities.

Choosing the ideal style is essential for reliable equipment performance. At Stafford Manufacturing Corp., our clamp-type collars and couplings come in a range of inch and metric sizes, material options, and configurations. We can also tailor a component to suit your specific needs.

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Fits and Tolerances

Every shaft collar and rigid coupling we produce at Stafford Manufacturing Corp. is machined with precision and accuracy to provide unrivaled consistency in fit, function, and appearance. The dimensional tolerances described below apply to our standard products. Our team is capable of providing ultra-precision products to tighter tolerances as needed for specialty applications.

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Hardware

At Stafford Manufacturing Corp., we use only high-grade materials and premium quality hardware in our shaft collars and rigid couplings. Socket set screws and socket head cap screws are either made of heat-treated alloy steel,18-8 stainless steel, or 316 stainless steel depending on the application and customer preference.

All hardware we use meets applicable ASA/ASME/ANSI B18.3 standards, which precisely outline quality specifications for socket cap, shoulder, and set screws. Because the hardware used in our shaft collars and rigid couplings has a significant impact on the parts’ performance, we carefully screen all raw material and hardware suppliers to ensure we are using the highest grade materials.

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Rigid Shaft Coupling Configurator

Build your rigid shaft coupling to spec in minutes. Select bore size, style, and material, then generate a CAD-ready model and quote instantly — no back-and-forth required.

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Shaft Collar and Coupling Basics

Historically, the primary function of a shaft collar was to retain its position on a shaft, and act as a stop or locator.

Largely through innovations by Stafford, shaft collars have taken on the jobs of:

  • Securing split hubs of other components
  • Acting as integral clamps for gears and sprockets
  • Actuating sensors in both rotary and linear motion
  • Attaching components to shafts and tube (round,
    square & hex)
  • Providing micrometer linear adjustments to other shaft components
  • Acting as adjustable spring tensioners
  • And many others

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Screw Seating Torque – Clamp-Type
Shaft Collars

Screw Seating Torque is defined as the recommended installation torque applied to the clamping screw(s) of a properly installed shaft collar to achieve the rated holding performance.

Proper seating torque depends on:

  • Screw size, thread pitch, and material
  • Friction between screw threads and collar material
  • Collar material (steel, stainless, aluminum)
  • Surface condition of mating threads

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