Rexnord 91040702 312S71-8-R-2.875-256.0 is a Thomas Disc coupling component. This part is designed for use in disc coupling assemblies, providing flexible torque transmission with stainless steel disc packs. The 312 size indicates a specific torque rating, and the S71-8 type denotes the hub or spacer configuration. The 2.875 dimension likely refers to bore size, and 256.0 may indicate overall length or other specification.

Nomenclature 312S71-8-R-2.875-256.0
Product Type S71-8
Product Size 312
Coupling / Components Required Complete Coupling
Hub-1 Description Hub-1 is Block Hub, Rough Bore
Hub-1 Bore Type Rough Bore (To Rex Standard)
Hub-1 Puller Hole Dimension Inch (Imperial)
Hub-2 Description Hub-2 is Standard, Bored
Hub-2 Bore Type Straight Finished Bore
Hub-2 Nominal Bore/Shaft Inch 2.87500
Hub-2 Bore Tolerance Interference AGMA 9002
Hub-2 Bore Diameter Min Inch 2.87300
Hub-2 Bore Diameter Max Inch 2.87400
Hub-2 Keyway Width 0.75000
Hub-2 Keyway Depth 0.37500
Hub-2 Quantity of Keyways 1 Keyway
Hub-2 Quantity of Setscrews No Setscrews
Hub-2 Puller Hole Two Standard Puller Holes
Hub-2 Puller Hole Dimension Inch (Imperial)
C Dimension (DBSE) Custom
C Dimension (DBSE) mm 256.0
Disc Pack Material Stainless (Standard SS Option)
Disc Pack Type T-Pack (Unitized Pack)