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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.



N/A 12S FLNG 1-1/2 N/KW

Coupling Size

N/A 12S


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 34.91 lb

Dimensional Data

Bore Size 

N/A 1 1/2 in

Thread (Dimension T)

N/A 1/2-13

Keyway Size (W x D)

N/A No Keyway

Outside Diameter

N/A 10.000 in254.00 mm

Max. Bore (Dimension ID)

N/A 3.875 in

Dimension FL

N/A 1.690 in42.93 mm

Dimension HD

N/A 5.750 in146.05 mm

Dimension L

N/A 4.000 in101.60 mm

Dimension P

N/A 1.280 in32.51 mm

Cubic inches

N/A 400.00000 in³

Performance Data

Nominal Torque (with EPDM Sleeve)

N/A 7200 in·lb

Max. Speed

N/A 2800.00 rpm

Torsional Stiffness

N/A 27500.00 in·lb/rad

Rated HP at 100 rpm

N/A 11.40 hp

Rated HP at 1,200 rpm

N/A 137.00 hp

Rated HP at 1,800 rpm

N/A 206.00 hp
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