Overview
The Martin 3535 2 3/4 taper-lock bushing is a precision cast iron component engineered for reliable shaft mounting and power transmission. With a 2.75-inch bore and 5-inch barrel diameter, this taper-lock bushing provides exceptional clamping force on pulleys, sheaves, and sprockets without protruding hardware. Class 30 gray cast iron construction delivers proven durability in demanding industrial environments.
Key Features
- 2.75-inch finished bore with 5/8 × 5/16-inch keyway for positive drive engagement
- Flush-mount design eliminates protruding parts and reduces mounting width
- Split taper (8°) locks securely onto the shaft via captive screws—no set screws required
- Class 30 gray cast iron resists wear, galling, and corrosion
- Increases clamping force compared to standard keyway-only fastening
- Interchangeable with equivalent taper-lock bushings from other manufacturers
Technical Specifications
- Bore Diameter: 2.750 inches
- Barrel Diameter (Large End): 5.000 inches
- Barrel Length: 3.5 inches
- Keyway Size: 5/8 × 5/16 inches
- Taper Angle: 8 degrees
- Material: ASTM Class 30 Gray Cast Iron
- Bolt Circle Diameter: 4.83 inches
- Number of Bolt Holes: 3
- Maximum Hub Outside Diameter: 6.5, 7, or 7.75 inches
- Mounting: Flush with no protruding parts
- Bore Type: Finished with keyway
Typical Applications
Martin 3535 taper-lock bushings are widely used in power transmission equipment including:
- Industrial motor and gearbox coupling with V-belt, synchronous belt, and chain-drive sprockets
- Construction and agricultural equipment requiring high-torque shaft connections
- Material handling conveyor systems and pulley assemblies
- HVAC and machinery fans where vibration-resistant mounting is critical
- General machinery where quick, tool-free removal and installation is valued
Compatibility & Replacements
Compatible With
- 3535-series taper bushing sprockets and pulleys
- Shafts sized 2.75 inches with 5/8 × 5/16-inch keyways
- Standard taper bushing drive components from Dodge, TB Woods, Precision Pulley & Idler, and equivalent manufacturers
- Motor-to-sheave and gearbox-to-pulley mounting applications
Replaces / Drop-In Replacement For
- Martin 3535X2¾KW (Martin’s standard designation)
- Dodge 3535X2 3/4 taper bushings
- TB Woods TL3535234 equivalent sizes
- Precision Pulley & Idler 3535 series 2¾ bore bushings
Works With
- Standard taper-bushed sheaves, pulleys, and sprockets (ANSI-compliant bore designs)
- Flexible coupling and pilot bore applications rated for 8° taper geometry
- Industrial power transmission systems requiring ISO or AGMA standard bushings
- Any shaft requiring secure, repeatable, tool-free mounting and dismounting
