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FA Type (Alloy Steel) Flex Hubs - Rough Stock Bore

For use with FA (Alloy Steel) Flex-Flex couplings.

The FA Type coupling provides a higher nominal torque value than standard F Type couplings, and consists of two FA Type flex hubs, two FA Type sleeves (with seals) and one accessory kit. Exposed bolts (E) are the standard design for this coupling, though shrouded bolt (S) designs are available upon request through size 5.5. The FA Type has a max angular misalignment of 3.0 degrees (1.5 degrees per gear mesh).

Unit of Measure




Hub Style

N/A Exposed Bolt


N/A Gear Coupling Hubs

Hub Material

N/A Alloy Steel


N/A Unbored


N/A Metallic

Bore Type

N/A Rough Stock Bore

Coupling Type

N/A Gear


N/A 56.00 lb

Complete Coupling Weight

N/A 190.00 lb

Dimensional Data


N/A 4

Set Screw Style Coupling Size (Dimension T)

N/A No Setscrew


N/A 7.500 in


N/A 7.500 in

Length Through Bore (LTB)

N/A 4.750 in120.65 mm

Overal Coupling Length (OAL)

N/A 9.75 in247.65 mm

Max. Bore (Dimensions ID1/ID2)

N/A 5.375 in147 mm

Dimension AD

N/A 10.250 in260.35 mm

Dimension D

N/A 9.250 in234.95 mm

Dimension HD

N/A 7.500 in190.50 mm

Distance between Shaft Ends (Dimension BSE)

N/A 0.250 in6.35 mm

Cubic inches

N/A 267.18750 in³

Performance Data

Nominal Torque

N/A 263400 in·lb29760 N·m

Max. Speed (Unbalanced)

N/A 3000 rpm

Max. Speed (Balanced)

N/A 4500.00 rpm

Parallel Misalignment

N/A 0.150 in

Max. Angular Misalignment

N/A 1.50º per Gear Mesh



  • Molded seals maintain proper lubricant retention during misalignment conditions
  • AISI 4140 Alloy Steel Construction
  • Patented Vari-Crown® tooth form for long life
  • Standard 20° pressure angle
  • Heat treated bolts for greater strength
  • Corrosion resistant bolts and nuts for ease of maintenance
  • Provides parallel, angular misalignment and end float
  • Flex Half coupling interchangeable with industry standards



  • Exposed Bolt Design is standard.
  • Shrouded Bolt Design available upon request for sizes 1 through 5.5.
  • Puller Holes are standard on sizes 4 through 7.
  • Puller Holes are available for sizes 1 through 3.5 at an additional charge.
  • Interference bores with no set screws are standard unless otherwise specified.
  • Inch bore and keyway tolerances conform to AGMA 9002-B04.
  • For metric bore and keyway tolerances, consult Lovejoy Engineering Section.
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