The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com
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F Type Rigid Hubs, Inch (Imperial) Bore & Keyway - Exposed and Shrouded Bolt Designs

For use with FFR (Flex-Rigid) or FRR (Rigid-Rigid) couplings.

The FFR Type coupling consists of one flex hub, one rigid hub, one sleeve, 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 FFR Type has a max angular misalignment of 1.5 degrees (1.5 degrees per gear mesh).

The FRR Type coupling consists of two rigid hubs and one accessory kit. Exposed bolts (E) are also the standard design for this coupling, though shrouded bolt (S) designs are available upon request through size 5.5. The FRR Type coupling does not accommodate for any angular misalignment.

For larger torques, consider the FHD Type gear coupling in sizes 10 through 30.

FRR Type Gear Coupling
FRR Type Gear Coupling Diagram
Unit of Measure
Items FRR Type Gear Coupling
69790413296
F Type Rigid Hubs, Inch (Imperial) Bore & Keyway - Exposed & Shrouded Bolt Designs 		FRR Type Gear Coupling
69790407459
F Type Rigid Hubs, Inch (Imperial) Bore & Keyway - Exposed & Shrouded Bolt Designs 		FRR Type Gear Coupling
69790414240
F Type Rigid Hubs, Inch (Imperial) Bore & Keyway - Exposed & Shrouded Bolt Designs 		FRR Type Gear Coupling
69790414262
F Type Rigid Hubs, Inch (Imperial) Bore & Keyway - Exposed & Shrouded Bolt Designs 		FRR Type Gear Coupling
69790414426
F Type Rigid Hubs, Inch (Imperial) Bore & Keyway - Exposed & Shrouded Bolt Designs
Description  N/A F-2E-HUB RGD-2-11/16-5/8X5/16KW N/A F-2.5E-HUB RGD-1-3/4-3/8X3/16KW N/A F-3S-HUB RGD-2-15/16-3/4X3/8KW N/A F-4E-HUB RGD-4-1/4-1"X1/2KW N/A F-4E-HUB RGD-5-3/8-1-1/4X5/8KW
Bore Size  N/A 2 11/16 in N/A 1 3/4 in N/A 2 15/16 in N/A 4 1/4 in N/A 5 3/8 in
Size N/A 2 N/A 2 1/2 N/A 3 N/A 4 N/A 4
Hub Style N/A Exposed Bolt N/A Exposed Bolt N/A Shrouded Bolt N/A Exposed Bolt N/A Exposed Bolt
Type N/A Gear Coupling Hubs
Hub Material N/A AISI 1045
Set Screw Style Coupling Size (Dimension T) N/A No Setscrew
Keyway Size (W x D) N/A 5/8 x 5/16 in N/A 3/8 x 3/16 in N/A 3/4 x 3/8 in N/A 1 x 1/2 in N/A 1 1/4 x 5/8 in
Nominal Torque N/A 31500 in·lb3560 N·m N/A 56700 in·lb6410 N·m N/A 94500 in·lb10700 N·m N/A 220500 in·lb24900 N·m N/A 220500 in·lb24900 N·m
Max Speed (Unbalanced) N/A 6000 rpm N/A 5500 rpm N/A 4400 rpm N/A 3000 rpm N/A 3000 rpm
Depth N/A 2.280 in57.91 mm N/A 2.910 in73.91 mm N/A 3.410 in86.61 mm N/A 4.440 in112.78 mm N/A 4.440 in112.78 mm
Length thru Bore N/A 2.280 in N/A 2.910 in N/A 3.410 in N/A 4.440 in N/A 4.440 in
Style N/A Bored
Color N/A Metallic
Bore Type N/A Rigid w/ Keyway
Max. Bore (Dimensions ID1/ID2) N/A 3.500 in88.90 mm N/A 4.250 in107.95 mm N/A 4.875 in123.83 mm N/A 6.500 in165.10 mm N/A 6.500 in165.10 mm
Dimension FD N/A 7.00 in177.80 mm N/A 8.38 in212.85 mm N/A 9.44 in239.78 mm N/A 12.50 in317.50 mm N/A 12.50 in317.50 mm
Dimension HD N/A 4.860 in123.44 mm N/A 5.840 in148.34 mm N/A 6.840 in173.74 mm N/A 9.250 in234.95 mm N/A 9.250 in234.95 mm
Coupling Type N/A Gear
Weight N/A 12.37 lb N/A 26.53 lb N/A 34.90 lb N/A 82.36 lb N/A 71.35 lb
Cubic inches N/A 111.72000 in³ N/A 204.35300 in³ N/A 303.87738 in³ N/A 693.75000 in³ N/A 693.75000 in³