Overview
The Martin 2517 2 1/4 taper bushing is a precision-engineered split-taper coupling component manufactured by Martin Sprocket & Gear, a trusted name in power transmission since 1951. This steel bushing is engineered to mount taper-bored pulleys, sheaves, sprockets, and similar components directly onto drive shafts with superior clamping force and zero slippage.
Key Features
- Split-taper design: Provides excellent clamping force when tightened against the tapered bore of driven components
- Flush mounting: Compact, non-flanged design reduces overall assembly width
- Sintered steel construction: Delivers durability and wear resistance in demanding industrial environments
- Keyway integral: 1/2″ × 1/4″ keyway prevents rotational slip between shaft and bushing
- Set-screw clamping: Two 1/2″-13 × 1″ socket-head screws enable field-adjustable tension without special tools
- ANSI-compliant: Meets American National Standards Institute and industry specifications
Technical Specifications
- Bore diameter: 2.25 inches (2-1/4″)
- Barrel diameter (large end): 3.375 inches
- Overall length: 1.75 inches
- Hub outside diameter: 4.375 to 5.5 inches (varies by hub configuration)
- Keyway size: 1/2″ × 1/4″
- Taper angle: 8 degrees
- Bolt circle diameter: 3.25 inches
- Number of bolt holes: 2
- Set-screw thread: 1/2″-13 UN
- Set-screw length: 1.0 inch
- Screw torque rating: 11,600 in-lbs maximum holding torque
- Material: Steel (sintered powder steel for enhanced strength)
- Weight: Approximately 2.0–2.5 lbs
Typical Applications
Martin 2517 series taper bushings are widely used in:
- Pulley and sheave assemblies for belt-drive systems
- Sprocket mounting on chain-drive power transmission systems
- Conveyor equipment and material-handling machinery
- Agricultural equipment and machinery
- Construction and industrial equipment
- Automotive drivetrain and accessory drive applications
- General mechanical power transmission wherever precision shaft coupling is required
Compatibility & Replacements
Compatible With
- Any taper-bored pulley, sprocket, or sheave rated for 2-1/4″ tapered bushing bore
- Standard ANSI taper-lock bushings and cross-manufacturer equivalent designs
- Shafts from 2.0″ to 2.5″ diameter with standard keyway slots
- Belt-drive, chain-drive, and direct-drive power transmission systems
Replaces / Drop-In Replacement For
- Martin 2517 2-1/4 (all equivalent stock numbers and variants)
- US Tsubaki taper-lock bushings in 2-1/4″ bore size
- Other ANSI-standard 2-1/4″ taper bushings with 8-degree taper angle
Works With
- Standard socket-head cap screws (1/2″-13 UN) for field installation and adjustment
- Hex keys (Allen wrenches) – 3/8″ for set-screw tightening
- Torque wrenches rated for 11,600 in-lb maximum holding applications
- Any OEM pulley or sprocket with taper-lock bushing compatibility
