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	Standard Coupling Guide

A Series	H Series	DS Series	MCA Series	MC7 Series	W Series	W Series
aluminum 7075-T6	stainless steel 17-4PH	aluminum 7075-T6	aluminum 7075-T6	stainless steel 17-4PH	aluminum 7075-T6	stainless steel 17-4PH
Description
General purpose, light to medium duty. An economical, maintenance free coupling, used in a variety of appli- cations. Helical's most popular coupling/coupler	Stainless steel version of “A” series, with higher torque capacity and torsional stiffness. Increased fatigue resistance.	Low inertia, high performance, aluminum coupling, using Helical double start technology. Torsionally stiffer and higher torque capacity than the “A“ series. Lighter with lower inertia than the “H” series.	A general purpose aluminum coupling, used where more parallel misalign- ment is required. Has a large range of shaft sizes, with optional keyways.	Stainless steel version of “MCA(C)” series, with higher torque capacity and torsional stiffness. Increased fatigue resistance.	Metric dimensioned coupling, with metric fasteners.  A light to medium duty coupling for those preferring to work strictly in the metric system.  A general purpose coupling.	Stainless steel version of the “WA(C)“ series, with higher torque capacity and torsional stiffness. Increased fatigue resistance with all metric dimensions and fasteners.
Typical Applications
Used for encoder/ resolver applications, low torque pump, lead screw and various other applications.	For situations requiring a heavy duty coupling such as pumps, lead screws, and positioning systems; also for process equipment in industrial situations. Anywhere a rugged, tough, long-lasting coupling is needed.	For high speed motion control systems, where fast response time is important. E.g., lead and ball screws, encoders/ resolvers, and anywhere high torsional stiffness is required.	Good for encoder/resolver applications, moderate torque pump, lead screw, and various other applications.	Good for pump, conveyor systems, and industrial processing equipment, where absolute reliability is required. Anywhere a rugged, tough, long-lasting coupling is needed.	Used for encoder/resolver applications, low torque pump, lead screw and various other applications.	For situations requiring a heavy duty coupling, for pump, lead screws, and positioning systems. Also for process equipment in industrial situations. Anywhere a rugged, tough, long-lasting coupling is needed.
Misalignment Compensation
5° angular,   .010 inch parallel offset, .010 inch axial motion	5° angular, . 010 inch parallel  offset, .010 inch axial motion	3° angular,  .010 inch parallel offset, .008 inch axial motion	5° angular,  .030 inch parallel offset, .010 inch axial motion	5° angular,  .030 inch parallel  offset, .010 inch axial motion	5° angular,   .25mm parallel offset, 25mm  axial motion	5° angular,  .25mm parallel   offset, .25mm axial motion
Torque Range
1.2-51 lbin	2.4-100 lbin	12-234 lbin	20-286 lbin	40-556 lbin	.59-20 Nm	1.2-39 Nm
Standard Bores (inch and or metric bores available in all couplings)
0.059-0.750 inch 1.5-19.05mm	0.059-0.750 inch 1.5-19.05mm	0.188-0.750 inch 4.78-19.05mm	0.250-.875 inch 6.35-22.23mm	0.250-1.000 inch 6.35-25.40mm	3mm-38.1mm	3mm-38.1mm
Attachment
Clamp or set screw	Clamp or set screw	Clamp	Clamp or set screw Keyways optional	Clamp or set screw Keyways optional	Clamp or set screw	Clamp or set screw
Operating temperatures
Up to 200°F	Up to 600°F	Up to 200°F	Up to 200°F	Up to 600°F	Up to 100°F	Up to 300°F
Speed (in the wind up direction)
10,000 rpm	10,000 rpm	10,000 rpm	3,600 rpm	3,600 rpm	10,000 rpm	10,000 rpm