Overview
The Falk 1203222 1040G flex hub gear coupling is a precision-engineered component from Rexnord’s Lifelign® series, designed for industrial motion control and power transmission applications. This straight bore flex hub features a steel construction with external gear teeth that mate with coupling sleeves to transmit torque while accommodating shaft misalignment. The 1040G size class is widely used in machinery requiring compact, torsionally rigid couplings with flexible engagement.
Key Features
- Straight rough stock bore (RSB) design accommodates 2.5″ to 5.75″ shaft diameters
- Lifelign® flex hub technology transmits torque while absorbing angular and parallel misalignment
- Steel hub construction with crowned gear teeth for optimal load distribution
- Maximum speed rating of 3600 RPM with 270,900 in-lb torque capacity
- Limited end floating design with lubrication access for maintenance
- Compatible with both single and double engagement coupling sleeves
Technical Specifications
- Coupling Size: 1040G
- Part Number: 1203222
- Hub Bore Range: 2.5″ to 5.75″ (straight rough stock)
- Hub Diameter: 8.25″ (outside)
- Hub Length: 4.75″ (through bore)
- Material: Steel
- Maximum RPM: 3600
- Torque Capacity: 270,900 in-lb
- Sleeve OD: 12.5″
- Operating Temperature Range: –20°F to +250°F (–29°C to +121°C)
- Series: Falk Lifelign® G Series
- Lubrication: Grease-lubricated (AGMA #8EP recommended)
Typical Applications
The Falk 1040G flex hub is employed across a range of industrial equipment including:
- Pumps and compressors requiring flexible, misalignment-tolerant engagement
- Electric motor-to-driven-equipment couplings in manufacturing environments
- Paper mill and textile machinery drivetrain components
- Mining and minerals processing equipment
- HVAC and refrigeration systems with dual-shaft transmission
Compatibility & Replacements
Compatible With
- Falk 1040G coupling sleeves (G10, G20, G52, G82 series)
- Straight shaft bores from 2.5″ to 5.75″ nominal diameter
- Standard AGMA gear coupling flange and bolt patterns
- Rexnord/Falk coupling maintenance kits and seal assemblies
Replaces / Drop-In Replacement For
- Falk 1040G hubs from previous production runs with identical bore ranges and torque ratings
- OEM replacement for installed 1040G coupling systems requiring hub renewal
- Verify alignment and bore specifications match your application before ordering
Works With
- Falk G-series flanged and continuous coupling sleeves (G20, G52, GP20, GP52)
- Standard coupling installation tools and alignment equipment (dial indicators, feeler gauges)
- Lithium soap/polymer grease per AGMA #8EP specification
- Industrial maintenance and predictive monitoring systems for condition-based service
