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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 3.5 HUB 3-5/8 7/8X7/16KW

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 40.00 lb

Complete Coupling Weight

N/A 130.00 lb

Dimensional Data

Bore Size 

N/A 3 5/8 in


N/A 3 1/2

Set Screw Style Coupling Size (Dimension T)

N/A No Setscrew

Keyway Size (W x D)

N/A 7/8 x 7/16 in

Length Through Bore (LTB)

N/A 4.190 in106.43 mm


N/A 6.500 in

Overall Length

N/A 8.63 in219.20 mm

Max. Bore (Dimensions ID1/ID2)

N/A 4.625 in124 mm

Dimension AD

N/A 9.380 in238.25 mm

Dimension D

N/A 7.910 in200.91 mm

Dimension FD

N/A 11.00 in279.40 mm

Dimension HD

N/A 6.5 in165.10 mm

Distance between Shaft Ends (Dimension BSE)

N/A 0.250 in6.35 mm

Cubic inches

N/A 177.02750 in³

Performance Data

Nominal Torque

N/A 177000 in·lb20000 N·m

Max. Speed (Unbalanced)

N/A 3500 rpm

Max. Speed (Balanced)

N/A 5250 rpm

Parallel Misalignment

N/A 0.130 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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