Overview
The Martin E-2-15/16 QD bushing is a high-performance quick disconnect mounting component manufactured by Martin Sprocket & Gear. Built from ductile iron for wear and corrosion resistance, this bushing enables fast, tool-free removal of pulleys, sheaves, and sprockets from drive shafts. The split design and tapered cone geometry provide strong, reliable clamping without requiring shaft removal, making it an ideal choice for industrial conveyors, machinery maintenance, and power transmission systems.
Key Features
- Quick Disconnect Design: Split through flange and taper for rapid mount/dismount without tools or shaft removal
- Ductile Iron Construction: Resists wear, galling, and corrosion in demanding industrial environments
- Finished Bore: Pre-bored to 2.9375″ with standard 3/4″ x 1/8″ keyway for drop-in shaft mounting
- Tapered Cone Grip: Provides secure clamping and prevents shaft rotation under load and vibration
- Set Screw Over Keyway: Helps retain the key on vertical shafts and with vibrating loads
Technical Specifications
- Bore Diameter: 2.9375 in (finished, with keyway)
- Flange Outside Diameter: 6 in
- Flange Thickness: 0.75 in
- Length Through Bore: 2.625 in
- Barrel Diameter: 3.834 in
- Barrel Length: 1.875 in
- Material: Ductile Iron (Class 60-40-18)
- Keyway Size: 3/4 x 1/8 in
- Set Screw Size: 3/8-16 x 3/8 in
- Pull-Up Bolts: 1/2-13 x 2-3/4 in (qty 3)
- Screw Torque: 720 in-lbs
- Number of Bolt Holes: 3
- Bolt Circle Diameter: 5 in
- Manufacturer Catalog Number: 7838-4111
Typical Applications
Martin E-2-15/16 QD bushings are used across manufacturing, material handling, and industrial automation for:
- Conveyor belt drive systems and line shaft conveyors
- Agricultural machinery and equipment
- Construction and mining equipment
- Motor-driven pulley and sheave assemblies
- Machinery requiring frequent pulley or sprocket changes without downtime
Compatibility & Replacements
Compatible With
- Martin E-series quick disconnect pulleys and sheaves
- Standard finished-bore QD sheaves and pulleys with matching 6″ flange OD
- Drive shafts with 2.9375″ diameter and 3/4″ x 1/8″ keyway slots
- Motor and gearbox output shafts requiring E-series bushing interface
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. This is an E-series finished-bore QD bushing; equivalent Martin and competitor models (such as TB Woods, Dodge, Browning, and Precision Pulley & Idler) may offer mechanically similar E2 15/16 units, but direct cross-reference should be confirmed.
Works With
- Martin QD sheaves, pulleys, and sprockets with E-series mounting
- Standard metric and inch keyway shafts
- All standard industrial fastening tools (Allen wrench, wrenches for pull-up bolts)
- ANSI, DIN, and ISO standard power transmission systems
