Overview
The Martin 3525 2 Taper Lock Bushing is a standard industrial taper lock bushing engineered for mounting pulleys, sheaves, and sprockets onto drive shafts. Made of class 30 gray cast iron, it is used for mounting a taper bushed pulley, sheave, or sprocket on a drive shaft. It is flush mounted for reduced mounting width and has a split taper for a tight clamp to shafts. This bushing is widely used in power transmission, materials handling, and industrial automation for reliable, vibration-resistant coupling.
Key Features
- Split Taper Design: Split and tapered outside surface so they will clamp to the shaft when tightened against the tapered bore of the driven component.
- Corrosion Resistance: Class 30 gray cast iron provides resistance to wear, galling, and corrosion.
- Keyway Lock: Keyed to the shaft to prevent the shaft from rotating in the bushing, ensuring positive drive engagement.
- Interchangeable: Interchangeable with taper bushings from various manufacturers.
- Flush-Mount Construction: No flange design allows compact integration in tight spaces.
Technical Specifications
- Bore Diameter: 2.0 inch (nominal)
- Outside Diameter (Barrel): 5.0 inch
- Hub Diameter: 7.0 inch
- Overall Length (OAL): 2.5 inch
- Taper Angle: 8 degrees
- Bolt Circle: 4.83 inch
- Mounting Bolts: 3 bolt holes, 1/2-13 UNC x 1-1/2 inch cap screws
- Holding Torque: 44,800 in-lb
- Material: Class 30 Gray Cast Iron
- Keyway: 1/2 x 1/4 inch (typical for 2-inch bore size)
- Series: Martin 3525 Standard Bore Type
Typical Applications
- Pulley and sheave mounting on motor and pump shafts
- Sprocket coupling for chain and belt drive systems
- Automobiles, construction equipment, agricultural machinery, and home appliances.
- Industrial fan and blower assemblies
- Conveyor system drives
- Compressor and machinery power transmission
Compatibility & Replacements
Compatible With
- All Martin 3525 series taper-bushed pulleys and sheaves
- Standard 2-inch bore taper-bushed components from Browning, Regal Rexnord, and other manufacturers
- Drive shafts with standard 2-inch taper bore receptacles
- Industrial machinery requiring 5-inch OD, 2.5-inch length mounting bushings
Replaces / Drop-In Replacement For
- Other Martin 3525 2-inch bore bushings
- Industry-standard 3525-sized taper lock bushings from competing manufacturers (verify bore size and keyway specifications)
Works With
- All taper-bushed pulleys and sheaves rated for 3525 series bushings
- Standard 1/2-13 UNC mounting hardware
- Drive shafts with 2-inch bore tapered receptacles
- Keyway-compatible shafts (1/2 x 1/4 inch standard keyway)
