• The J Type flanges in sizes 3J and 4J are made from die cast of high strength zinc alloy (tensile strength of 41,000 psi) and are furnished bore-to-size.
  • Size 5J is provided in either zinc alloy or cast iron depending on the bore size.
  • Size 6J is made from cast iron.
  • J flanges are compatible with EPDM or Neoprene sleeves.
  • Each flange has a keyway and two set screws (one set screw over the key and one at 90° to the keyway).
  • The J Type coupling consists of two flanges and one sleeve.
Unit of Measure



N/A 3J FLNG 3/8 N/KW

Coupling Size

N/A 3J


N/A Coupling Flange


N/A Zinc Die Cast


N/A Gray

Bore Type

N/A Finished Bore

Coupling Type

N/A S-Flex


N/A 0.30 lb

Dimensional Data

Bore Size 

N/A 3/8 in

Thread (Dimension T)

N/A 1/4-20

Keyway Size (W x D)

N/A No Keyway

Outside Diameter

N/A 2.062 in52.37 mm

Max. Bore

N/A 0.875 in

Dimension FL

N/A 0.380 in9.65 mm

Dimension HD

N/A 1.500 in38.10 mm

Dimension L

N/A 0.810 in20.57 mm

Dimension P

N/A 0.440 in11.18 mm

Dimension SL

N/A 0.250 in6.35 mm

Cubic inches

N/A 3.44399 in³

Performance Data

Nominal Torque (with EPDM Sleeve)

N/A 60 in·lb

Max. Speed

N/A 9200.00 rpm

Torsional Stiffness

N/A 229.00 in·lb/rad

Rated HP at 100 rpm

N/A 0.10 hp

Rated HP at 1,200 rpm

N/A 1.10 hp

Rated HP at 1,800 rpm

N/A 1.70 hp

Rated HP at 3,600 rpm

N/A 3.40 hp



  • Spacing between shafts should be greater than 1/8 inch and less than OAL minus the sum of the two bore dimensions.