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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 8.62 lb

Complete Coupling Weight

N/A 34.00 lb

Dimensional Data


N/A 2

Set Screw Style Coupling Size (Dimension T)

N/A No Setscrew


N/A 4.000 in


N/A 4.000 in

Length Through Bore (LTB)

N/A 2.440 in61.98 mm

Overal Coupling Length (OAL)

N/A 5.00 in127.00 mm

Max. Bore (Dimensions ID1/ID2)

N/A 2.750 in73 mm

Dimension AD

N/A 6.000 in152.40 mm

Dimension D

N/A 4.860 in123.44 mm

Dimension HD

N/A 4.000 in101.60 mm

Distance between Shaft Ends (Dimension BSE)

N/A 0.130 in3.30 mm

Cubic inches

N/A 39.04000 in³

Performance Data

Nominal Torque

N/A 39000 in·lb4410 N·m

Max. Speed (Unbalanced)

N/A 5000 rpm

Max. Speed (Balanced)

N/A 7500.00 rpm

Parallel Misalignment

N/A 0.085 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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