Overview
The Falk 1203220 is a Lifelign G Series flex hub manufactured by Rexnord for 1030G gear couplings. This rough stock bore (RSB) hub is engineered for flexible coupling assemblies that accommodate shaft misalignment while transmitting torque reliably. The 1203220 flex hub is sized for 1030G couplings with a bore range of 1.5″ to 4.125″, making it suitable for a wide range of shaft diameters.
Key Features
- Triple-crowned AGMA 20° full depth teeth for reduced backlash and radial clearances
- 6.000-inch outside barrel diameter with 3.59-inch length for gear couplings
- Rough stock bore design — allows field machining to match your specific shaft diameter
- Completely flexible coupling design that accommodates offset, angular, and axial misalignments
- Steel construction for durability and load capacity
- Three-year warranty when used with genuine Falk Lifelign components and Falk LTG grease
Technical Specifications
- Bore Diameter Range: 1.5″ – 4.125″ (machined in field)
- Hub Outside Diameter: 6.000″
- Hub Length (Through Bore): 3.59″
- Coupling Size: 1030G
- Material: Steel
- Tooth Profile: AGMA 20° Full Depth, Triple-Crowned
- Hub Style: Straight Rough Stock Bore (RSB)
- Maximum Speed: 4,400 RPM (typical rating)
Typical Applications
Falk 1203220 hubs are widely used in:
- Fan and blower drive systems
- Pump and compressor couplings
- Conveyor belt drive assemblies
- Motor-to-driven equipment connections requiring misalignment compensation
- Steel mill, paper mill, and heavy manufacturing equipment
- Close-coupled horizontal shaft arrangements
Compatibility & Replacements
Compatible With
- Falk Lifelign G Series gear couplings (1030G size)
- G Series flexible sleeves (EXP and SHR types)
- Falk LTG grease lubrication systems
- Any shaft with bore diameter between 1.5″ and 4.125″
Replaces / Drop-In Replacement For
- Original equipment manufacturer (OEM) Falk 1203220 units
- Worn or damaged 1030G flex hubs in existing assemblies
- Verify bore machining requirements before installation to ensure fit
Works With
- Falk Lifelign seal kits (part numbers 0785308–0785329)
- G Series sleeves (EXP G20 and SHR G10 styles)
- Standard industrial lubrication and maintenance systems
- Any electric motor, engine, or prime mover with compatible shaft size
