• S flanges are made of high strength cast iron and are bored-to- size for a slip fit on standard shafts.
  • S flanges are easy to install, are readily available from stock in a wide range of popular bore sizes, and are supplied with two set screws at 90°.
  • The S Type coupling consists of two flanges and one sleeve.
Unit of Measure



N/A 9S FLNG 7/8 N/KW

Coupling Size

N/A 9S


N/A Coupling Flange


N/A Cast Iron


N/A Gray

Bore Type

N/A Finished Bore

Coupling Type

N/A S-Flex


N/A 8.46 lb

Dimensional Data

Bore Size 

N/A 7/8 in

Thread (Dimension T)

N/A 1/2-13

Keyway Size (W x D)

N/A No Keyway

Outside Diameter

N/A 6.350 in161.29 mm

Max. Bore (Dimension ID)

N/A 2.375 in

Dimension FL

N/A 1.030 in26.16 mm

Dimension HD

N/A 3.630 in92.20 mm

Dimension L

N/A 2.410 in61.21 mm

Dimension P

N/A 0.780 in19.81 mm

Dimension SL

N/A 0.410 in10.41 mm

Cubic inches

N/A 97.17723 in³

Performance Data

Nominal Torque (with EPDM Sleeve)

N/A 1800 in·lb

Max. Speed

N/A 3750.00 rpm

Torsional Stiffness

N/A 6875.00 in·lb/rad

Rated HP at 100 rpm

N/A 2.90 hp

Rated HP at 1,200 rpm

N/A 34.00 hp

Rated HP at 1,800 rpm

N/A 51.00 hp

Rated HP at 3,600 rpm

N/A 103.00 hp



  • All standard finished bore keyway flanges have 2 set screws at 90°.
  • Sizes 13, 14 and 16 RSB flanges are suitable for reboring and have two set screws at 90°.
  • Sizes 5-12 RSB flanges have no set screws.
  • Metric Bore / Keyway per DIN specifications.
  • Spacing between shafts should be greater than 1/8 inch and less than OAL minus the sum of the two bore dimensions.