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Style comparison chart

Shaft collars

They act as a stop to retain equipment on shafts

Key advantage
Characteristics
Available materials/finish

Set

Most economical shaft collar. You install them on a shaft by tightening a set screw that extends through the shaft collar. Unfortunately, the screw often mars the shaft. Inch – steel, zinc plated, black oxide, plain and bright finish stainless steelMetric – steel, black oxide.Stainless steel

Single split

Doesn’t mar the shaft and provides a much greater axial load than set screw collars. Used when the end of the shaft is accessible, and collars can be slid into position. Functions as a clamp around the circumference of the shaft. Held in place by one socket head cap screw. Diameters up to 1-1/2 inches (35mm) have a relief cut, which allows the smaller screws used in those diameters to provide maximum clamping load. Inch – steel, black oxide,bright finish stainless steel and aluminumMetric – steel, black oxide and bright finish stainless steel

Double split

Loaded values exceed that of a single split collar by about 10%. Used for mid-shaft applications when components such as bearings, sprockets or sheaves are already in place, or when a slightly greater axial load is desired. Can compensate for a slightly undersized or oversized shaft. Held in place by two socket head cap screws. Inch -steel, black oxide and bright finish stainless steelAluminumMetric – steel, black oxide and bright finish stainless steel

Heavy split

Slightly larger outer diameter than standard split collars Comes as single and double split. Have recessed screw heads. Inch -steel black oxide and bright finish stainless steel

Threaded

Split collars that are used on threaded shafts. Available in USS (coarse) and SAE (fine) thread. Single and double split styles. Inch -Single – steel black oxide, bright finish stainless steel.Double – steel, black oxide

Shaft couplings

They connect two shafts such as a temporary repair when a shaft breaks, or as a permanent connector between a power source and a component driven on a separate shaft

Key advantage
Characteristics
Available materials/finish

Rigid

Most economical. Comes with or without keyways. Held by two set screws. Installed by a set screw that extends through the shaft collar. Unfortunately, that screw often mars the shaft. Inch – steel, black oxide

Single split

Comes with or without keyways. Come with straight and stepped bores (inch only) for joining different diameter shafts. Clamp with four cap screws. Stepped bores available in inch without keyway. Inch, metric – steel, black oxide and bright finish stainless steel

Double split

Comes with or without keyways. Come with straight and stepped bores (inch only) for joining different diameter shafts. Develop a greater load than a single split shaft coupling, due to the eight socket cap screws vs. the four used in single split. Double split with keyway provide the greatest load available in a coupling application. Stepped bores available with and without keyways in inch. Inch, metric – steel, black oxide and bright finish stainless steel


More on shaft collars and couplings

Material content

Steel is mild low carbon to ASTM A 283 GrC or equivalent, which can be machined, welded, and case hardened.

Stainless steel is 18-8 series, passivated.

Aluminum is aircraft Grade 2024A or equivalent, which has high strength, excellent fatigue resistance, and a bright finish.

Finishes

Standard finishes on steel collars are RoHS-compliant bright zinc and clear chromate or black oxide and oil.

Custom finishes such as chrome, nickel, zinc and yellow dichromate are also available on steel split collars and couplings.

  • Note: plated shaft collars and couplings come with unplated screws. This is to protect against hydrogen embrittlement, which causes failures when hardened socket cap screws are plated.
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