The Timken Company - U Type without Keyway, Regular Version - Inch (Imperial) Bores

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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.

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Items	68514413015 U Type without Keyway, Regular Version - Inch (Imperial) Bores	68514413040 U Type without Keyway, Regular Version - Inch (Imperial) Bores	68514426095 U Type without Keyway, Regular Version - Inch (Imperial) Bores	68514413074 U Type without Keyway, Regular Version - Inch (Imperial) Bores	68514413084 U Type without Keyway, Regular Version - Inch (Imperial) Bores
Description	N/A U18-CP-1/4X1/4-NKW BE	N/A U25R-CP-5/16X5/16-NKW BE	N/A U25R-CP-1/4X1/4-NKW BE	N/A U37R-CP-1/4X1/4-NKW BE	N/A U37R-CP-3/8X3/8-NKW BE
Bore Size	N/A 1/4 x 1/4 in	N/A 5/16 x 5/16 in	N/A 1/4 x 1/4 in	N/A 1/4 x 1/4 in	N/A 3/8 x 3/8 in
Hub Style	N/A Regular
Type	N/A Shaft-to-Shaft
Hub Size	N/A U18R	N/A U25R	N/A U25R	N/A U37R	N/A U37R
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 0.06 lb	N/A 0.09 lb	N/A 0.10 lb	N/A 0.27 lb	N/A 0.27 lb
Dimension HD	N/A 0.610 in15.50 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 1.500 in38.10 mm	N/A 1.500 in38.10 mm	N/A 2.060 in52.32 mm	N/A 2.060 in52.32 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 18.00 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 0.310 in7.87 mm	N/A 0.380 in9.65 mm	N/A 0.380 in9.65 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 0.313 in7.95 mm	N/A 0.313 in7.95 mm	N/A 0.375 in9.53 mm	N/A 0.375 in9.53 mm
Max. Speed	N/A 30000.00 rpm
Axial Misalignment (∆ Ka)	N/A 0.010 in0.25 mm	N/A 0.020 in0.51 mm	N/A 0.020 in0.51 mm	N/A 0.020 in0.51 mm	N/A 0.020 in0.51 mm
Max. Parallel Misalignment	N/A 0.008 in0.20 mm	N/A 0.011 in0.28 mm	N/A 0.011 in0.28 mm	N/A 0.014 in0.36 mm	N/A 0.014 in0.36 mm
Wind-Up Angle at Nominal Torque	N/A 1.80 º	N/A 1.80 º	N/A 1.80 º	N/A 1.78 º	N/A 1.78 º
Wind-Up Angle at Max. Torque	N/A 3.00 º	N/A 4.5 º	N/A 4.5 º	N/A 4.5 º	N/A 4.5 º
Rated HP at 100 rpm	N/A 0.03 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 0.37210 in³	N/A 0.79935 in³	N/A 0.79935 in³	N/A 1.52358 in³	N/A 1.52358 in³