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 Gear Coupling Hubs

Hub Material

N/A AISI 1045


N/A Unbored


N/A Metallic

Bore Type

N/A Center

Coupling Type

N/A Gear


N/A 25.00 lb

Complete Coupling Weight

N/A 46.00 lb

Dimensional Data


N/A 3

Overall Length 

N/A Determined by Length of Mill Motor Hub

Outside Diameter

N/A 6.630 in6.63 mm

Max. Bore (Dimensions ID1/ID2)

N/A 3.13 in84.00 mm

Dimension CBD

N/A 4.750 in120.65 mm

Max. Safe Counterbore (Dimension CBD1)

N/A 3.880 in98.55 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 5.750 in146.05 mm

Dimension HL

N/A 2.630 in66.80 mm

Dimension HD

N/A 4.750 in120.65 mm

Dimension LS

N/A 3.750 in95.25 mm

Dimension R

N/A 6.880 in174.75 mm

Dimension SL

N/A 1.880 in47.75 mm

Cubic inches

N/A 59.33938 in³

Performance Data

Nominal Torque

N/A 50400.00 in·lb

Max. Speed (Unbalanced)

N/A 3600.00 rpm

Max. Angular Misalignment

N/A 0.50 º

Parallel Misalignment

N/A 0.010 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.