Overview
The Falk 1050T31 shaft hub is a replacement component designed for Steelflex Torus flexible coupling systems. Manufactured by Falk (a Rexnord brand), this hub serves as the rotating element that interfaces with shafts in power transmission applications. Built to OEM specifications, the 1050T31 hub delivers reliable performance across pumps, blowers, compressors, and other industrial machinery.
Key Features
- Precise bore specifications: 1-7/8″ bore diameter with 1/2″ × 1/4″ square keyway for secure shaft engagement
- Full Spacer Type T31 design: Accommodates axial separation between shafts while maintaining torque transmission
- Compatible with multiple coupling sizes: Works with T31, T35, WA32, and WA36 Steelflex Torus coupling assemblies
- Steel construction: Durable alloy steel material for high-torque industrial applications
- New in Box condition: Factory-sealed, untested component ready for inventory or immediate deployment
- OEM-grade quality: Meets Rexnord/Falk specifications for drop-in replacement compatibility
Technical Specifications
| Part Number | 1050T31 |
| Manufacturer | Falk (Rexnord) |
| Coupling Type | Steelflex Torus Grid Coupling — Full Spacer Type T31 |
| Bore Diameter | 1-7/8″ |
| Bore Length | 2-3/8″ |
| Outer Diameter (OD) | 4-7/8″ |
| Keyway Dimensions | 1/2″ × 1/4″ (square) |
| Compatible Coupling Models | T31, T35, WA32, WA36 Steelflex Torus |
| Material | Alloy Steel |
| Condition | New in Box |
| Coupling Size Range | 1050 series (compatible with T31/T35 spaced hub assemblies) |
Typical Applications
- Pump systems: Centrifugal pumps and positive displacement pump drives
- Compressors and blowers: Constant-torque and variable-load air handling equipment
- HVAC equipment: Cooling towers and forced-draft fan drives
- Industrial conveyance: Belt conveyors and material handling systems requiring moderate shock loads
- Machine tool drives: Motors coupled to spindles, presses, and extruders
- Generator sets: Prime mover coupling applications in energy generation
Compatibility & Replacements
Compatible With
- Falk Steelflex T31 Full Spacer Couplings (sizes 1020T through 1200T)
- Falk Steelflex T35 Half Spacer Couplings
- Falk Steelflex WA32 and WA36 coupling assemblies
- Shaft diameters up to the maximum bore capacity (1-7/8″)
- Standard NEMA and ISO motor frames with compatible shaft diameters
Replaces / Drop-In Replacement For
- Original Falk 1050T31 shaft hub units (OEM spare part)
- Part #713013 (alternate designation for 1050T31)
- Worn or damaged T31 hub components in 1050-series Steelflex couplings
Works With
- Falk Long Term Grease (LTG) — recommended lubricant for extended service intervals
- Falk Steelflex T31 elastomeric grid elements and flex packs
- Standard industrial keystock (1/2″ × 1/4″ square key)
- Rexnord alignment and installation tools (per technical documentation 428-110, 458-834)
- Retrofit kits for existing Steelflex coupling frame assemblies
