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FA Type (Alloy Steel) Flex Hubs with Keyway - Inch (Imperial) 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



N/A FA 6 HUB 8" 2X3/4 KW

Hub Style

N/A Exposed Bolt


N/A Gear Coupling Hubs

Hub Material

N/A Alloy Steel


N/A Bored


N/A Metallic

Coupling Type

N/A Gear


N/A 118.09 lb

Complete Coupling Weight

N/A 650.00 lb

Dimensional Data

Bore Size 

N/A 8 in


N/A 6

Set Screw Style Coupling Size (Dimension T)

N/A No Setscrew

Keyway Size (W x D)

N/A 2 x 3/4 in

Length Through Bore (LTB)

N/A 7.41 in188.21 mm


N/A 11.500 in

Overall Length

N/A 15.130 in384.30 mm

Max. Bore (Dimensions ID1/ID2)

N/A 8.250 in225 mm

Dimension AD

N/A 17.000 in431.80 mm

Dimension D

N/A 14.000 in355.60 mm

Dimension FD

N/A 18.00 in457.20 mm

Dimension HD

N/A 11.50 in292.10 mm

Distance between Shaft Ends (Dimension BSE)

N/A 0.310 in7.87 mm

Cubic inches

N/A 979.97250 in³

Performance Data

Nominal Torque

N/A 877100 in·lb99110 N·m

Max. Speed (Unbalanced)

N/A 2100 rpm

Max. Speed (Balanced)

N/A 3150 rpm

Parallel Misalignment

N/A 0.120 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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