Overview
The Martin 3535 3 taper-lock bushing is a cast iron power transmission component engineered for secure, maintainable shaft-coupling applications. Built on Martin’s proven tapered-cone technology, this bushing accommodates a 3-inch bore diameter and delivers repeatable, tool-free removal when system maintenance or replacement is required. The 3-1/2-inch overall length and standardized flange design integrate seamlessly with sprockets, sheaves, and custom-bored hubs across industrial automation systems.
Key Features
- Cast Iron Construction: Class 30 gray iron for durability and corrosion resistance in harsh plant environments
- Tapered-Cone Design: 8-degree taper delivers consistent radial and axial grip without shims, reducing assembly time
- Tool-Free Removal: Set screw mechanism allows field disassembly for maintenance without heating or special equipment
- High Torque Rating: Rated for 44,800 in-lb (5,072 Nâ‹…m) torque load capacity
- 3/4″ × 3/8″ Keyway: Industry-standard keyway size for compatibility with common shaft stock and sprocket hubs
- 3-Bolt Mounting: Distributed pull-up bolts ensure even seating and prevent slippage under load
Technical Specifications
- Bore Diameter: 3.000 inches (76.2 mm)
- Barrel Diameter (OD): 5.000 inches (127.0 mm)
- Overall Length: 3-1/2 inches (88.9 mm)
- Keyway: 3/4″ × 3/8″ × 3.5″
- Taper Angle: 8 degrees (standard)
- Bolt Circle Diameter: 4.83 inches
- Number of Bolt Holes: 3
- Pull-Up Bolt Size: 1/2″ × 1-1/2″ (half-threaded in bushing, full-threaded in hub)
- Torque Rating: 44,800 in-lb (5,072 Nâ‹…m)
- Material: Cast Iron, Class 30 gray iron
- Surface Finish: As-cast (paint-ready)
- Series: Martin 3535 (Standard Taper-Lock)
Typical Applications
- Motor-to-pump couplings and belt-drive systems
- Conveyor pulley and drum sheave mounting
- Gearbox input/output shaft bushings
- Sprocket and chain-drive assemblies
- Fan rotor and impeller hub fastening
- Industrial automation equipment power transmission
Compatibility & Replacements
Compatible With
- Martin Series 3535 taper-bored hubs (sheaves, sprockets, pulleys)
- Any 3-inch bore, 8-degree taper-bored component with 4.83-inch bolt circle
- Standard ISO metric and fractional-inch shafts up to 3.000″ diameter
- Martin weld-on and bolt-on hubs rated for 3535 bushings
Replaces / Drop-In Replacement For
- Martin 3535 3 (existing inventory part)
- Dodge 117229 (equivalent taper-lock bushing for 3″ bore applications)
- Any original-equipment 8-degree taper-lock bushing with identical bore and bolt-circle dimensions
Works With
- All standard power transmission equipment using taper-lock bushings (sprockets, sheaves, pulleys, couplings)
- Requires half-threaded holes in hub and alternating torque procedure per Martin installation guide
- Compatible with general mechanical assembly and field maintenance practices—no special tools required beyond standard socket set and torque wrench
