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  • 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 Lovejoy: CAD Models are accurate envelope dimensions only. Features such as bore size and keyway are not rendered or are only representative. Contact Lovejoy Technical Support or refer to product catalogs for details.


  • 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.




Coupling Size

N/A 16S


N/A Coupling Flange


N/A Cast Iron


N/A Gray

Bore Type

N/A Rough Stock Bore

Coupling Type

N/A S-Flex


N/A 125.30 lb

Dimensional Data

Bore Size 

N/A 2 in

Thread (Dimension T)

N/A 5/8-11

Keyway Size (W x D)

N/A No Keyway

Outside Diameter

N/A 18.875 in479.43 mm

Max. Bore (Dimension ID)

N/A 5.500 in

Dimension FL

N/A 2.750 in69.85 mm

Dimension HD

N/A 8.000 in203.20 mm

Dimension L

N/A 6.000 in152.40 mm

Dimension P

N/A 2.000 in50.80 mm

Dimension SL

N/A 1.000 in25.40 mm

Performance Data

Nominal Torque (with EPDM Sleeve)

N/A 47250 in·lb

Max. Speed

N/A 1500.00 rpm

Torsional Stiffness

N/A 180480.00 in·lb/rad

Rated HP at 100 rpm

N/A 75.00 hp

Rated HP at 1,200 rpm

N/A 900.00 hp
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