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Shaft collars have extremely diverse applications. Shaft collars have been used on applications from holding up a flag on a flag pole, to positioning devices on medical equipment to the more common industrial applications of holding other shaft components such as bearings, sprockets and pulleys in place. In general, shaft collar applications fall into one of three broad categories:
Set-screw collars were the first type of shaft collar used. These collars were mass-produced
and used on line-shafting in mills. In the 1900's, in response to safety concerns of the
protruding head, the safety set collar with a recessed head socket set screw was introduced.
The set-screw collar is the most common and most economical shaft collar. As the name indicates, the collar holds onto the shaft via a set screw that presses into the shaft. This penetration of the screw point into the shaft provides most of the holding power though friction between the shaft and the collar also contributes slightly.
The two-piece clamping collar has two tangential screws. The main advantage of the two-piece
collar is that it can be installed without having to remove other components on the shaft.
Steel collars are the most commonly used. 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 food processing, pharmaceutical or marine applications or those in which components are washed frequently. Climax Metal Products Company Premium Shaft Collars and Rigid Couplings are made from Austenitic Type 303 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.
All steel split collars and all couplings have a black oxide finish, which is industry standard. Set-screw collars are also offered with a black oxide finish (indicated by the "-BO" after the part number).
Zinc-plating is the generally accepted industry standard for set-screw collars and is used on all Climax Metal Products Company standard set screw collars (the "C"-Series), except for one line (the "C-BO"-Series) that has a black oxide finish.
Climax Metal Products Company stainless steel and aluminum collars have a plain bright finish. Climax Metal Products Company offers numerous special finishes to meet particular needs. Special finishes include anodizing for aluminum collars and special zinc-plating with greater corrosion resistance.
While there are no formal industry standards for shaft collars, the dimensions of most manufacturers' collars are fairly uniform. In most applications, dimensions other than the bore are considered non-critical. Climax Metal Products Company provides dimensions and tolerances for all bore, outer diameter and width dimensions in our catalog. And we are always happy to quote special dimensions as needed.
The purpose of the relief cut is to allow the one-piece collar to close and tighten securely on the shaft. A relief cut is important only on smaller bore collars. Climax Metal Products Company 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).
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 collars, the face groove also helps keep the two halves of the Two-Piece collar properly oriented.