Overview
The Falk 0258639 is a spacer hub component designed for Falk Steelflex grid couplings in the 1070 size class. This rough stock bore (RSB) hub is engineered to work with T31 and T35 shaft configurations, providing flexible power transmission between motor and driven equipment. Falk couplings are manufactured by Regal Rexnord (formerly Rexnord Industries) and are recognized for durability and high torque capacity in critical industrial applications.
Key Features
- Rough Stock Bore (RSB) Design — Minimum bore is the smallest bore to which a Rough Stock Bore (RSB) hub can be bored, with the ability to permit remachining of the hubs to specified minimum bores
- Torsional Flexibility — Steelflex couplings torsionally deflect under shock or vibratory loads, damping vibration and reducing peak or shock loads by as much as 30%
- High Strength Steel Grid — Tapered grids are made of high strength alloy steel, quenched and tempered to spring hardness
- Industrial Reliability — Steelflex grid couplings are warranted for 5 years when lubricated with Falk Long Term Grease
- Standard Spacer Hub Type — Designed to support separated shaft alignment with flexibility for absorbing misalignment and shock loads
Technical Specifications
- Coupling Size: 1070
- Hub Type: Spacer (T31/T35 designation)
- Bore Style: Rough Stock Bore (RSB) — machining available
- Material: High-strength alloy steel, quenched and tempered
- Surface Treatment: Precision shot peened for fatigue resistance
- Design Standard: Falk Steelflex grid coupling per Rexnord specifications
- Peak Torque: Two times the published rating
- Lubrication: Requires Falk LTG (Long Term Grease) for warranty coverage
- Maximum RPM: Verify per application; consult Falk documentation for speed ratings on 1070 size
Typical Applications
Falk Steelflex grid couplings are used in:
- Mining and quarrying equipment with high shock loads
- Gearbox drive systems requiring flexible coupling and vibration damping
- Large industrial fans and blowers
- Pump drives with variable or surging loads
- Motor-to-gearbox transmission requiring misalignment accommodation
- Conveyors and heavy material handling systems
Compatibility & Replacements
Compatible With
- Falk Steelflex 1070 size grid couplings
- 1070T31 shaft hub configurations
- 1070T35 shaft hub configurations
- Rexnord/Falk grid element assemblies designed for 1070 class
- Standard industrial drive systems requiring flexible power transmission
Replaces / Drop-In Replacement For
This is a replacement spacer hub for Falk Steelflex 1070 series grid couplings. Verify your original coupling model and configuration before ordering. Depending upon coupling size, RSB hubs may have only a blind centering hole or a through hole that will permit remachining of the hubs to minimum bores specified. Exact replacement compatibility requires matching the original part number and bore configuration.
Works With
- Falk Steelflex grid elements (premium and standard duty)
- Taper-Lock and straight bore shaft hubs
- Industrial keyway and setscrew fastening systems
- Regal Rexnord LTG (Long Term Grease) lubrication system
- Standard industrial power transmission systems (motors, gearboxes, pumps, fans)
