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  • Lovejoy offers flexible sleeves for S-Flex Endurance couplings in three designs: one-piece solid, one-piece split, and two-piece with retaining ring
  • The one-piece split design provides solutions for applications with unique requirements where small shaft separations inhibit the installation of a one-piece solid sleeve
  • Pre-molded teeth along the diameter of the sleeve engage with teeth of the coupling flanges
  • No clamps or screws are needed to connect the flanges with the flexible sleeve which securely lock together under torque for smooth transmission of power
  • Torque is transmitted through shear loading of the sleeve
  • All three sleeve materials are highly elastic which permits the S-Flex coupling to protect connected equipment from harmful shock loading, vibration, and shaft misalignment
JE, JN, JES, JNS Sleeve Types
    These sleeves feature a one-piece design molded in EPDM & Neoprene rubber. In the case of JES & JNS Types, the one-piece design is split to provide for ease of installation and removal.
Unit of Measure




Coupling Size


Sleeve Type



N/A Sleeves for S-Flex Endurance Couplings


N/A Neoprene


N/A Black w/ Green Dot

Connection Type A x B

N/A Coupling Sleeve


N/A 0.09 lb

Nominal Torque

N/A 60 in·lb6.78 N·m

Dimensional Data

Min. Bore

N/A 0.375 in

Max. Bore

N/A 0.875 in

Length (Dimension G)

N/A 0.440 in11.18 mm

Outside Diameter

N/A 1.880 in47.75 mm

Dimension L

N/A 1.000 in25.40 mm

Cubic inches

N/A 1.55514 in³

Performance Data


N/A 0 to 200 ºF-18 to 93 ºC

Max. Speed

N/A 9200.00 rpm

Angular Misalignment

N/A 1 º

Max. Parallel Misalignment

N/A 0.062 in

Max. Torsional Wind-Up Angle

N/A 15.00 º

Axial Misalignment

N/A 0.1250 in



    Neoprene provides very good performance characteristics for most applications and offers a very good resistance to chemical and oil conditions. Color is black with a green dot.
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