Frequently Asked Questions Regarding Shaft Collars egarding Shaft Collars

What type of shaft collars does Climax manufacture?

Climax manufactures set screw collars and clamping collars. We also customize dimensions, add keyways, offer balanced collars, provide specialized plating and manufacture from a variety of materials.


Set Screw Collars are the most commonly used and cost effective shaft collars. The holding power of a set screw collar is provided by the impingement of the screw into the shaft. Lightweight styles are available for an application that has a space constraint. If additional load capacity is required, Climax provides a set screw collar line with a second screw at 90°. Set screw collars are also available with a keyway for keyed shafts.

Clamp Collars are designed in a one-piece or two-piece style. They provide additional holding power over set screw collars and do not mar the shaft.


One-Piece Clamp Collars are designed with one tangential screw to handle applications that require a greater axial load capacity than set screw collars. Recessed screw styles of one-piece clamp collars are available to provide safety with an outside surface free of major projections. Special design End-Stop Collars fit over rail assemblies on precision shafting.


Two-Piece Clamp Collars are designed with two tangential screws to handle applications that require greater axial load capacity than set screw and one-piece clamping collars. A two-piece clamp collar can be installed without any major disassembly of the other components. Recessed screw styles of two-piece clamping collars are available to provide safety with an outside surface free of major projections. Two-piece clamp collars can also be manufactured with a keyway for keyed shafts. Special design Double-Wide Two-Piece Clamping Collars can be used for high axial load applications and they are also ideal for areas that are too constrained for a full-size shaft coupling.


Threaded Clamp Collars provide a greater amount of axial holding capacity on threaded shafts. The design fully engages the thread for secure locking. Recessed screw styles of threaded clamp collars are available to provide safety with an outside surface free of major projections.


What are materials are used in manufacturing Climax collars?


Steel Collars are the most commonly used and manufactured. The exact type of steel used varies depending on the machine process but generally low-carbon steel is used, including materials such as 12L14, 1215, and 1026.


Stainless Steel Collars are used primarily in applications where component wash down is frequent such as food processing, pharmaceutical or marine applications. Climax manufactures with austenitic Type 303 and Type 316 stainless steel that meets FDA guidelines.


Aluminum Collars are lighter, have the non-magnetic properties of aluminum desirable for many applications, and have a bright gleaming finish that is highly suitable for applications with high visibility. Colored or clear anodizing can also be provided as a "special" finish.


Acetal Collars will not rust or corrode and are ideal for applications where component wash down is frequent. Climax acetal shaft collars include stainless steel screws.


Climax does not manufacture with powdered or sintered steel because it makes a poor quality collar and cannot be welded. In sintered set screw collars, the threads tend to be weak and not uniform in performance.


What finishes does Climax offer?


Black Oxide finish on our mild steel collars is formulated as part of the total performance of the collar. The black oxide affects the anti-stick-slip characteristics and helps keep the torque rating of the screw within its design parameters. Black oxide also has corrosion resistant properties for indoor environmental applications. However, black oxide is not intended as an outside weather protective finish. Other advantages to black oxide collars include dimensional uniformity with negligible thickness and no flaking or chipping.


Zinc plating is generally accepted as the industry standard for set-screw collars. Zinc plating provides corrosion resistance in indoor environmental applications and has a "shiny silver" appearance for product appeal. Special zinc-plating, often associated with different colorings, such as yellow-zinc dichromate or black zinc plating, can be applied to greatly increase corrosion resistance.


Climax offers other special finishes including anodizing for aluminum collars and special zinc-plating with greater corrosion resistance. Contact customer service for complete information on Climax's special finishes.


What is the industry standard for a shaft collar?

While there is no formal industry standard for shaft collars the dimensions of most manufacturers' collars are fairly uniform. In most applications, the shaft collar bore is considered a critical dimension while other dimensions such as OD and width are considered non-critical. Dimensions for Climax shaft collars can be found on our website and in paper format. For shaft collars needing special dimensions contact our customer service department.


Why does a one-piece collar have a relief cut?

The relief cut allows the one-piece clamping collar space to close and tighten securely on the shaft. A relief cut is important only on smaller bore collars. Climax puts a relief cut in collars with a 1 ½" bore or smaller (under 40mm in metric and under 1 ¾-16 in threaded collars).


Why do clamping collars have face grooves?

The face groove on clamping collars indicates the face that should be placed against a bearing or other component requiring a perpendicular to bore orientation. For two-piece clamping collars, the face groove also helps keep the two halves of the collar properly oriented during installation.


Can a Climax shaft collar be welded?

Shaft collars can be welded with some exceptions. Mild steel and stainless steel materials contain sulfur and other additives which allow for welding. However, the lowest possible current and adequate ventilation should be employed. Be sure to remove screws before welding. However, in no cases should collars with zinc plating be welded. The welding process on a zinc plated product will produce noxious fumes. Welding can be done safely on a black oxide finished product. Extreme caution is recommended when welding imported collars because of the inconsistency of the material and finishes.


What is axial holding power?

The primary purpose of a shaft collar is to resist an axial load. That is to hold itself in place despite pressure along the axis of a shaft. The axial holding power is primarily a function of screw size and applied torque. However, other factors such as presence of oil, temperature, the finish and hardness of the shaft can impact the holding power.


What are Climax’s Terms & Conditions?

For a complete explanation of our business policies, please see the Terms of Use on our website.


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