The Stafford Manufacturing Corp. standard product offering consists of over 4000 shaft collars, rigid shaft couplings and specialty mechanical components. While the large majority of these products are manufactured at our Wilmington, Massachusetts headquarters, we also distribute domestic and imported parts.
Our products are used in a wide range of industrial and consumer OEM and MRO applications, including power transmission, motion control, material handling and automation. They also have non-rotary uses in linear motion, fixturing, display and assembly.
For an overview of all our products and capabilities we invite you to read The Stafford Advantage (PDF – 1.71MB).
Stafford organizes products into eight families. Product Type designates six broad classifications providing a unique designation for each of our part categories within similar types of products. Further, there are two Special Function families, which regroup a selection of part categories across all product types used for a particular purpose.
The outline below is designed to provide a guide to the function and features of the products in the families illustrate the major categories in each product family and some of the features and benefits of each.
The category listings are representative; search the online catalog to view the full selection in each.
You can also navigate directly to the section in the catalog by clicking on the category links below.
About Clamp-Type Shaft Collar and Rigid Coupling Styles
High Strength – our most popular style, where the heads of the clamping screw are recessed.
Low Profile – this style has a smaller outside diameter but the screw head does protrude slightly beyond the outside diameter.
Heavy Duty – have larger clamping screws and a greater outside diameter for superior holding capacity.
Heavy Duty shaft collars have twice the Torsional Holding Power of standard collars
Heavy Duty Rigid Couplings have three times the Torsional Holding Power of regular couplings. They are also longer and have more screws than regular couplings.
Clamping force is applied by tightening a screw directly pressing onto the shaft.
Best on a soft shaft when there is a low axial load (the force along the shaft which would cause the collar to lose its hold) and frequent adjustment is not necessary.
Disadvantages – damage the shaft.
Clamp-Type or Split Collars
Retain their position through the clamping power generated by tightening one or more clamp screws which do not touch the shaft, tube or pipe.
Superior clamping power to set screw style on hard or soft shafts as well as on thin-walled tubing.
Do not mar shafts.
Easy to adjust.
The same as a shoulder on a shaft when it is clamped in position. However, it is much less expensive than machining a shoulder and it can be easily moved to a new location.
As the clamping mechanism over a split-hub. In this case, the clamping power is transmitted from the collar to the hub-shaft interface. The self-centering split-hub design is a common way to connect components to a shaft.
As a torque-transmitting component when other torque-inducing components (such as lever arms, pulleys, sprockets, etc.) are mounted to it.
One-Piece Split Clamp-Type Collars
Have a single screw and do not come apart.
Used when there is access to the end of the shaft.
Significant increase in axial holding power over set screw type.
Two-Piece Split Clamp-Type Collars
Have two screws and can be completely disassembled.
Used where the user does not have access to the end of the shaft.
Will function well on shafts .015″ or more under nominal diameter.
Approximately 10% more holding power than an equivalent one-piece collar.
Hinge-Type Shaft Collars
Combines flexibility of the two-piece collar with the simplicity of the one-piece
Can be assembled anywhere on the shaft as a single unit without all the loose parts that can be dropped or lost.
They are perfect where fast operation is required, such as hostile environments or situations where there are space and time constraints.
For use on standard round shafts, hard or soft, as well as on thin wall tube or over a split hub.