Overview
The Falk 1090T31/35 grid coupling shaft hub is a precision-engineered component designed for industrial power transmission applications. This steel hub with rough stock bore (RSB) profile is manufactured by Rexnord and is the standard shaft-side coupling hub for 1090T Steelflex grid coupling assemblies. It provides secure shaft-to-hub connection and accommodates angular, parallel, and axial misalignment through the grid element’s controlled flex characteristics.
Key Features
- Steel Construction: Durable steel material provides long service life and consistent torque transmission in demanding industrial environments.
- RSB Profile: Rough stock bore design allows for custom machining to exact application requirements without pre-bored limitations.
- 1090T Size Class: 5.620-inch outside barrel diameter and 4.00-inch length geometry for direct compatibility with 1090T grid coupling assemblies.
- No Keyway Design: Minimum plain bore with bore range of 1-1/16 to 4 inches, adaptable to various shaft diameters.
- High-Speed Capability: Maximum speed rating of 3600 rpm, suitable for electric motor and turbine drive applications.
Technical Specifications
- Coupling Size: 1090T
- Hub Type: Shaft hub
- Bore Profile: RSB (rough stock bore), no keyway
- Bore Range: 1-1/16″ to 4″
- Hub Diameter (OD): 5.62″
- Hub Length (thru bore): 4″
- Flange Diameter (overall): 8-1/4″
- Maximum Operating Speed: 3600 rpm
- Material: Steel
- Bushings: None (bare hub)
- Part Number: 0258641
- Weight: 24.5 lbs (approx.)
- Manufacturer: Rexnord (Falk brand)
Typical Applications
Falk Steelflex grid couplings are lubricated couplings with seals and gaskets, making them ideal for industrial machinery requiring reliable power transmission with misalignment tolerance. Common applications include:
- Electric motor to gearbox/reducer connections
- Pump and compressor drive couplings
- Conveyor and material handling equipment
- Industrial fan and blower installations
- Machine tool and textile equipment drives
Compatibility & Replacements
Compatible With
- Falk Steelflex 1090T10, 1090T31, and 1090T35 grid coupling assemblies
- Regal Rexnord mechanical power transmission systems
- Industrial machinery using 1090T coupling class components
- Shaft diameters 1-1/16″ through 4″ (custom machining required)
Replaces / Drop-In Replacement For
This shaft hub directly replaces OEM Falk 1090T31/35 hubs and is interchangeable with equivalent 1090T Steelflex coupling shaft hubs from Rexnord. Verify shaft bore and coupling type compatibility before installation.
Works With
- Falk Steelflex grid coupling covers (horizontally and vertically split)
- Falk grid elements for 1090T couplings
- Standard coupling hardware and fastener kits
- Rexnord coupling installation and maintenance documentation
