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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U Type Shaft-to-Shaft
    The U Type is the basis for all Uniflex couplings. It is a shaft-to-shaft flexible coupling with a simple one piece design, making it ideal for indexing, robotic or positioning applications. The U Type consists of a triple-wound flexible steel spring brazed to a steel hub at each end. This all steel design ensures optimum equipment protection in severe environments and/or high temperature applications. Regular and short versions are available for most sizes to accommodate different overall length requirements. Special hub or bore modifications are also possible. These units can be supplied with either pin holes or with keyways and set screws. Lovejoy does not recommend the reboring of uniflex couplings by customers due to potential damage to the brazed joint.
    This is a durable one-piece flexible coupling for general purpose shaft-to- shaft applications. It is the basis for all Uniflex coupling types.
U Type Uniflex Couplings w/ Keyway, Regular Version, Shaft-to-Shaft Configuration - Imperial
U Type Uniflex Couplings w/ Keyway, Regular Version, Shaft-to-Shaft Configuration - Imperial-2
Unit of Measure
Items U Type Uniflex Couplings w/ Keyway, Regular Version, Shaft-to-Shaft Configuration - Imperial
68514413063
U Type without Keyway, Short Version - Inch (Imperial) Bores 		U Type Uniflex Couplings w/ Keyway, Regular Version, Shaft-to-Shaft Configuration - Imperial
68514426096
U Type without Keyway, Short Version - Inch (Imperial) Bores 		U Type Uniflex Couplings w/ Keyway, Regular Version, Shaft-to-Shaft Configuration - Imperial
68514444777
U Type without Keyway, Short Version - Inch (Imperial) Bores 		U Type Uniflex Couplings w/ Keyway, Regular Version, Shaft-to-Shaft Configuration - Imperial
68514413103
U Type without Keyway, Short Version - Inch (Imperial) Bores 		U Type Uniflex Couplings w/ Keyway, Regular Version, Shaft-to-Shaft Configuration - Imperial
68514444809
U Type without Keyway, Short Version - Inch (Imperial) Bores
Description  N/A U25S-CP-5/16X5/16-NKW BE N/A U25S-CP-1/4X1/4-NKW BE N/A U25S-CP-3/16X3/16-NKW BE N/A U37S-CP-3/8X3/8-NKW BE N/A U37S-CP-1/4X3/8-NKW BE
Bore Size    N/A 5/16 x 5/16 in N/A 1/4 x 1/4 in N/A 3/16 x 3/16 in N/A 3/8 x 3/8 in N/A 1/4 x 3/8 in
Hub Style N/A Short
Type N/A Shaft-to-Shaft
Hub Size N/A U25S N/A U25S N/A U25S N/A U37S N/A U37S
Material N/A Steel
Set Screw Thread Size (Dimension T) N/A 6-32 N/A 6-32 N/A 6-32 N/A 10-24 N/A 10-24
Keyway Size (W x D) N/A No Keyway
Weight N/A 0.09 lb N/A 0.09 lb N/A 0.10 lb N/A 0.22 lb N/A 0.22 lb
Weight (Complete Coupling w/ Max. Bores) N/A 0.10 lb N/A 0.10 lb N/A 0.10 lb N/A 0.27 lb N/A 0.27 lb
Dimension HD N/A 0.730 in18.54 mm N/A 0.730 in18.54 mm N/A 0.730 in18.54 mm N/A 0.860 in21.84 mm N/A 0.860 in21.84 mm
Overall Length N/A 1 in25.4 mm N/A 1 in25.4 mm N/A 1 in25.4 mm N/A 1.650 in41.91 mm N/A 1.650 in41.91 mm
Pin Location (Dimension SL) N/A 0.160 in N/A 0.160 in N/A 0.160 in N/A 0.250 in N/A 0.250 in
Color N/A Gray/Metallic
Operating Temperature Range N/A -40 to 250 ºF
Max. Torque N/A 34.00 in·lb N/A 34.00 in·lb N/A 34.00 in·lb N/A 39.00 in·lb N/A 39.00 in·lb
Length thru Bore N/A 0.320 in8.13 mm N/A 0.320 in8.13 mm N/A 0.320 in8.13 mm N/A 0.520 in13.21 mm N/A 0.520 in13.21 mm
Bore Type N/A Finished Bore
Min. Bore (Dimensions ID1/ID2) N/A 0.125 in3.00 mm N/A 0.125 in3.00 mm N/A 0.125 in3.00 mm N/A 0.250 in6 mm N/A 0.250 in6 mm
Max. Bore (Dimensions ID1/ID2) N/A 0.250 in6.35 mm N/A 0.250 in6.35 mm N/A 0.250 in6.35 mm N/A 0.375 in9.53 mm N/A 0.375 in9.53 mm
Bore Dia. [Max]  N/A 0.313 in8.00 mm N/A 0.313 in8.00 mm N/A 0.313 in8.00 mm N/A 0.375 in10.00 mm N/A 0.375 in10.00 mm
Max. Speed N/A 30000.00 rpm
Axial Misalignment (∆ Ka) N/A 0.015 in0.38 mm
Max. Parallel Misalignment N/A 0.007 in0.18 mm N/A 0.007 in0.18 mm N/A 0.007 in0.18 mm N/A 0.009 in0.23 mm N/A 0.009 in0.23 mm
Wind-Up Angle at Nominal Torque N/A 1.07 º N/A 1.07 º N/A 1.07 º N/A 1.09 º N/A 1.09 º
Wind-Up Angle at Max. Torque N/A 3.00 º
Rated HP at 100 rpm N/A 0.05 hp N/A 0.05 hp N/A 0.05 hp N/A 0.06 hp N/A 0.06 hp
# of Set Screws Required per Hub N/A 1
Cubic inches N/A 0.53290 in³ N/A 0.53290 in³ N/A 0.53290 in³ N/A 1.22034 in³ N/A 1.22034 in³