Overview
The Martin 3020 1 1/4 tapered bushing is a split taper lock bushing designed for mounting pulleys, sheaves, sprockets, and other power transmission components onto drive shafts. Made of sintered powder steel for greater strength and wear resistance than plain carbon steel, this bushing delivers reliable performance in industrial machinery applications.
Key Features
- Flush mounted for reduced mounting width with a split taper for tight clamp to shafts
- Keyed to the shaft to prevent the shaft from rotating in the bushing
- Split design utilizes set screws for convenient tightening and strong clamping force
- Used in automobiles, construction equipment, agricultural machinery, and home appliances
- Industry-standard 8-degree taper angle for reliable engagement
Technical Specifications
- Bore Diameter: 1.25 inches
- Barrel Diameter (Large End): 4.25 inches
- Overall Length: 2 inches
- Material: Sintered Steel
- Keyway Size: 1/4 x 1/8 inches
- Bolt Circle Diameter: 4 inches
- Taper Angle: 8 degrees
- Number of Bolt Holes: 2
- Screw Thread: 5/8-11 x 1-1/4 inches
- Maximum Torque: 24,000 inch-pounds
Typical Applications
The Martin 3020 1 1/4 is suitable for:
- Belt drive systems with taper-bushed pulleys
- Chain drive systems with taper-bushed sprockets
- Equipment requiring quick and secure shaft mounting without welding
- Agricultural and construction equipment power transmission
- Conveyor and material handling systems
Compatibility & Replacements
Compatible With
- All Martin 3020-series taper-bushed sheaves, pulleys, and sprockets
- Compatible with standard 1.25″ bore pulley and sprocket hubs
- Works with split-taper mounting on drive shafts
Replaces / Drop-In Replacement For
- Direct replacement for Martin 3020 1 1/4 model numbers across manufacturers
- Interchangeable with taper bushings from various manufacturers
Works With
- 1.25″ bore taper-bushed pulleys and sheaves
- 1.25″ bore taper-bushed sprockets
- Standard drive shafts with 1.25″ diameter
- Belt and chain drive systems
