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    CMM Type Mill Motor Couplings

    The CMM Type coupling consists of one standard flex hub, one universal hub, one standard sleeve and one accessory kit consisting of seals and snap rings.
  • Designed with longer universal hub on one end to accommodate straight or tapered shafts
  • Standard hub and sleeve on the other end
  • Universal hub bored to customer specifications
  • Available with longer universal hubs on both ends
Unit of Measure



N/A CMM 2.5 HUB 2.375/2.376 5/8KW


N/A Gear Coupling Hubs

Hub Material

N/A AISI 1045


N/A Bored


N/A Metallic

Coupling Type

N/A Gear


N/A 14.00 lb

Complete Coupling Weight

N/A 29.00 lb

Dimensional Data

Bore Size 

N/A 2 3/8 in


N/A 2 1/2

Keyway Size (W x D)

N/A 5/8 in

Overall Length 

N/A Determined by Length of Mill Motor Hub

Max. Bore (Dimensions ID1/ID2)

N/A 2.630 in70.00 mm

Outside Diameter

N/A 5.500 in5.50 mm

Dimension CBD

N/A 3.750 in95.25 mm

Max. Safe Counterbore (Dimension CBD1)

N/A 3.250 in82.55 mm

Dimension DC

N/A 0.250 in6.35 mm

Dimension DC1

N/A Determined by Customer Specifications

Dimension G

N/A 0.250 in6.35 mm

Max. Length of Universal Hub (Dimension HL1)

N/A 5.130 in130.30 mm

Dimension HD

N/A 3.94 in100.08 mm

Dimension HL

N/A 2.250 in57.15 mm

Dimension LS

N/A 3.060 in77.72 mm

Dimension R

N/A 5.720 in145.29 mm

Dimension SL

N/A 1.530 in38.86 mm

Cubic inches

N/A 34.92810 in³

Performance Data

Nominal Torque

N/A 30200.00 in·lb

Max. Speed (Unbalanced)

N/A 3750.00 rpm

Max. Angular Misalignment

N/A 0.50 º

Parallel Misalignment

N/A 0.007 in



  • Specifically designed for mill motors with tapered bores
  • Universal hub counterbored for the nut on the end of the motor shaft
  • One piece cylindrical sleeve for smoother, faster, quieter and safer operation
  • Quick assembly and disassembly



  • HL1 Dimensions are the maximum lengths of Universal hubs kept in stock and altered to customer specifications.
  • Longer length hubs are made to order.
  • Dimension CBD1 as shown is the maximum safe counterbore. Diameter of this counterbore is to customer specifications.
  • Rough bore mill motor hubs are manufactured to HL1 length with straight bores.
  • Puller Holes are standard on sizes 4 through 12.
  • Puller Holes are available for sizes 7/8 through 3.5 at an additional charge.
  • Interference bores with no set screws are standard unless otherwise specified.
  • Inch bores and keyway tolerances conform to ANSI / AGMA 9002-B04.
  • For metric bores and keyway, consult Lovejoy Engineering Section.
  • Larger sizes are available, please consult Lovejoy Technical Support.
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