Overview
The Martin 2012 1 5/8 taper bushing is a precision-engineered split-taper bushing manufactured by Martin Sprocket & Gear for power transmission and mechanical drive applications. This non-flanged, flush-mount design reduces overall assembly width while delivering reliable shaft-to-hub coupling for pulleys, sheaves, sprockets, and other mechanical components. The 1 5/8″ (1.625″) bore accommodates intermediate-diameter shafts commonly found in conveyor systems, pump drives, and industrial machinery.
Key Features
- Split-taper design – provides superior clamping force without keyway slip
- Sintered steel construction – greater strength and wear resistance than plain carbon steel
- Flush-mount profile – minimal protruding parts reduce assembly space requirements
- Keyway-finished bore – eliminates separate keying operations and improves concentricity
- Two-screw assembly – 7/16″-14 mounting screws with 280 in-lbs torque rating
- ANSI standard construction – meets American National Standards Institute specifications
Technical Specifications
The following specifications are based on the Martin 2012 series standard dimensions:
- Bore diameter: 1 5/8″ (1.625″)
- Barrel diameter (large end): 2.75″
- Barrel length: 1.25″
- Bore type: Finished with keyway
- Material: Sintered steel
- Mounting holes: 2 (bolt circle diameter 2 5/8″)
- Screw thread size: 7/16″-14
- Screw torque: 280 in-lbs
- Keyway size: 3/8″ x 3/16″
- Installation: Split-taper with two set screws
Typical Applications
The Martin 2012 1 5/8 taper bushing is widely used in:
- Conveyor and power transmission systems
- Pump and blower drive shafts
- Agricultural and construction machinery
- Industrial motor couplings
- Machine tool spindles and grinding wheel arbors
- Automotive transmission and drivetrain assemblies
Compatibility & Replacements
Compatible With
- Standard taper-bushed pulleys with 1 5/8″ bore
- V-belt sheaves rated for 1 5/8″ shaft size
- Sprockets with taper-bore hubs
- Timing pulleys and synchronous belt drives with taper bores
- Industrial drive shafts 1 5/8″ diameter and larger
Replaces / Drop-In Replacement For
- Dodge 2012X1 5/8KW
- Warner Electric 2012X1 5/8KW
- US Tsubaki Inc. 2012 1 5/8
- TB Woods TL2012158
Works With
- Standard 7/16″-14 set screws and wrenches
- Industrial keyway tools and broaches
- Universal taper-bushing pulley and sheave hubs
- ANSI-standard mechanical drive components
