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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RRU Type - Drop-Out Style
    The RRU Type Uniflex coupling is designed for fast, easy installation and removal without disrupting the connected shafts. This is ideal when servicing impellers, bearings and seals. The design consists of two steel hubs fastened with cap screws to a Uniflex double flange coupling (UF Type). The RRU is easily disassembled by simply removing the cap screws and sliding out the UF center spring section.
    This design offers “quick disconnect” for drop out requirements. It can also accommodate a slightly larger shaft diameter than the standard U Type.
    Note: A complete RRU Type coupling is comprised of 2 hubs, 2 hardware kits, and a UF Type center drop out section.
RRU Type Uniflex Coupling Hubs w/ Keyway, Drop-Out Style - Imperial
RRU Type Uniflex Coupling Hubs w/ Keyway, Drop-Out Style - Imperial-2
Unit of Measure
Items RRU Type Uniflex Coupling Hubs w/ Keyway, Drop-Out Style - Imperial
68514413695
RRU Type Hubs without Keyway - Inch (Imperial) Bores 		RRU Type Uniflex Coupling Hubs w/ Keyway, Drop-Out Style - Imperial
68514444208
RRU Type Hubs without Keyway - Inch (Imperial) Bores 		RRU Type Uniflex Coupling Hubs w/ Keyway, Drop-Out Style - Imperial
68514413740
RRU Type Hubs without Keyway - Inch (Imperial) Bores 		RRU Type Uniflex Coupling Hubs w/ Keyway, Drop-Out Style - Imperial
68514446477
RRU Type Hubs without Keyway - Inch (Imperial) Bores 		RRU Type Uniflex Coupling Hubs w/ Keyway, Drop-Out Style - Imperial
68514446489
RRU Type Hubs without Keyway - Inch (Imperial) Bores
Description  N/A RRU50-HUB-7/16-NKW N/A RRU50-HUB-3/8-NKW N/A RRU75-HUB-3/8-NKW N/A RRU87-HUB-1/2-NKW N/A RRU125-HUB-1/2-NKW
Bore Size  N/A 7/16 in N/A 3/8 in N/A 3/8 in N/A 1/2 in N/A 1/2 in
Hub Style N/A RRU Hub
Coupling Type N/A Drop-Out
Coupling N/A RRU50 N/A RRU50 N/A RRU75 N/A RRU87 N/A RRU125
Material N/A Steel
Set Screw Thread Size (Dimension T) N/A 1/4-20 N/A 1/4-20 N/A 1/4-20 N/A 1/4-20 N/A 3/8-16
Keyway Size (W x D) N/A No Keyway
Overall Length N/A 3.520 in89.41 mm N/A 3.520 in89.41 mm N/A 4.270 in108.46 mm N/A 4.840 in122.94 mm N/A 5.840 in148.34 mm
Color N/A Gray/Metallic
Max. Torque N/A 82.00 in·lb N/A 82.00 in·lb N/A 175.00 in·lb N/A 346.00 in·lb N/A 755.00 in·lb
Bore Type N/A Finished Bore
Min. Bore (Dimensions ID1/ID2) N/A 0.375 in9.53 mm N/A 0.375 in9.53 mm N/A 0.375 in9.53 mm N/A 0.438 in11.13 mm N/A 0.625 in15.88 mm
Max. Bore (Dimensions ID1/ID2) N/A 1.000 in25.40 mm N/A 1.000 in25.40 mm N/A 1.25 in31.75 mm N/A 1.375 in34.93 mm N/A 1.625 in41.28 mm
Max. Speed N/A 30000.00 rpm N/A 30000.00 rpm N/A 20000.00 rpm N/A 10000 rpm N/A 6000 rpm
Dimension BC N/A 1.500 in38.10 mm N/A 1.500 in38.10 mm N/A 2.000 in50.80 mm N/A 2.250 in57.15 mm N/A 3.120 in79.25 mm
Dimension D N/A 1.880 in47.75 mm N/A 1.880 in47.75 mm N/A 2.380 in60.45 mm N/A 2.750 in69.85 mm N/A 3.560 in90.42 mm
Dimension FD N/A 2.000 in50.80 mm N/A 2.000 in50.80 mm N/A 2.500 in63.50 mm N/A 2.880 in73.15 mm N/A 3.680 in93.47 mm
Dimension FL N/A N/A N/A N/A N/A 0.500 in12.70 mm
Dimension FL1 N/A 0.250 in6.35 mm N/A 0.250 in6.35 mm N/A 0.380 in9.65 mm N/A 0.380 in9.65 mm N/A 0.500 in12.70 mm
Dimension HD N/A 2.000 in50.80 mm N/A 2.000 in50.80 mm N/A 2.500 in63.50 mm N/A 2.870 in72.90 mm N/A 2.750 in69.85 mm
Dimension HL N/A 1.000 in25.40 mm N/A 1.000 in25.40 mm N/A 1.250 in31.75 mm N/A 1.380 in35.05 mm N/A 1.620 in41.15 mm
Dimension S N/A 1.560 in39.62 mm N/A 1.560 in39.62 mm N/A 1.810 in45.97 mm N/A 2.120 in53.85 mm N/A 2.620 in66.55 mm
Pin Location (Dimension SL) N/A 0.500 in N/A 0.500 in N/A 0.620 in N/A 0.690 in N/A 0.560 in
Pin Size N/A 1/8 in N/A 1/8 in N/A 1/8 in N/A 3/16 in N/A 5/16 in
Max. Recommended End Play N/A 0.035 in0.89 mm N/A 0.035 in0.89 mm N/A 0.040 in1.02 mm N/A 0.040 in1.02 mm N/A 0.040 in1.02 mm
Max. Parallel Offset N/A 0.021 in0.53 mm N/A 0.021 in0.53 mm N/A 0.028 in0.71 mm N/A 0.035 in0.89 mm N/A 0.044 in1.12 mm
Max. Angular Offset N/A 4.50 º
Wind-Up Angle at Max. Torque N/A 1.82 º N/A 1.82 º N/A 1.82 º N/A 1.68 º N/A 1.85 º
Rated HP at 100 rpm N/A 0.13 hp N/A 0.13 hp N/A 0.28 hp N/A 0.55 hp N/A 1.21 hp
# of Set Screws Required per Hub N/A 1
Cubic inches N/A 4.00000 in³ N/A 4.00000 in³ N/A 7.81250 in³ N/A 11.44627 in³ N/A 21.93869 in³
Max. Torque N/A 82 in·lb N/A 82 in·lb N/A 175 in·lb N/A 346 in·lb N/A 755 in·lb
Weight N/A 0.60 lb N/A 0.60 lb N/A 1.68 lb N/A 1.20 lb N/A 3.50 lb