Rigid Couplings

Rigid couplings are a type of coupling that should only be utilized when shafts are precisely in line. A rigid coupling is only suitable for shafts in close alignment or held in alignment. If not aligned, torque will transfer to the shafts and bearings and likely cause premature failure. Unlike most other types of couplings, there is no flexible element in a rigid coupling.

There are three main types of rigid couplings: sleeve, flanged and clamped. For commercial shafting, a rigid coupling may be a sleeve with the shafts pressed into each end or it may be a clamping sleeve. The sleeve on each shaft end may have an external flange with bolt holes. Couplings for large power machines are bolted together to hold the shafts rigidly; therefore the shafts must be accurately aligned before assembly.

Here is a list of Manufacturers / Brands that we represent:

• Regal PTS (KopFlex)
• Rexnord (Falk)
• Baldor (Dodge)
• Renold
• Collars and Couplings
• Climax
• Royersford
• Altra Motion (Boston, Ameridrive/ Zurn)
• Dalton
• Lovejoy
• Ruland
• Stafford
• QM

There are three main types of rigid couplings:

1. Sleeve or muff coupling: This type of coupling consists of a hollow cylinder (sleeve) with an equal diameter bore that fits over the ends of the two shafts to be connected. The sleeve is then fastened to the shafts using keys, set screws, or other fastening methods. Sleeve couplings are simple in design and provide a rigid connection between shafts while allowing for minor misalignment.
2. Clamp or split coupling: Clamp couplings, also known as split couplings, consist of two halves that are bolted or clamped together around the shafts to be connected. Each half of the coupling has a semi-circular shape, and when assembled, they form a complete circle around the shafts. Clamp couplings are easy to install and allow for axial movement of the shafts while providing a rigid connection.
3. Flanged coupling: Flanged couplings consist of two halves, each with flanges that are bolted together to connect the shafts. The flanges are typically connected using bolts or studs and nuts. Flanged couplings are commonly used in applications where high torque transmission is required, and they provide a rigid and secure connection between shafts. They are also suitable for applications where shaft misalignment needs to be minimized.

These three types of rigid couplings vary in design and application but share the common characteristic of providing a rigid connection between shafts while allowing for torque transmission and maintaining alignment. The choice of coupling type depends on factors such as the application requirements, shaft size, torque capacity, and ease of installation.