Overview
The Martin NS 4 15/16 QD Short bushing is a quick-disconnect hub engineered for belt conveyor systems and similar industrial power-transmission applications. Its short-hub design fits compact mounting spaces while maintaining the proven QD (quick detachable) interface. The cast iron construction delivers durability and long service life in demanding environments.
Key Features
- Quick-Disconnect Design: Enables tool-free removal and installation of sprockets, sheaves, and pulleys without disturbing the shaft or coupling
- Short-Hub Profile: Compact length suitable for tight conveyor pulley designs
- Cast Iron Barrel & Flange: Provides strength and thermal stability in heavy-duty service
- Dual-Mounting Capability: Mounts with flange toward motor or away from motor depending on application layout
- Precision Keyway: 1-1/4″ × 5/8″ keyway ensures secure shaft coupling
Technical Specifications
- Bore Diameter: 4-15/16″ (4.9375″)
- Bushing Style: NS (short hub, QD series)
- Material: Cast Iron
- Keyway: 1-1/4″ × 5/8″
- Bolt Circle: 8.5″
- Weight: 43 lb
- Flange Design: Tapped for pull-up bolts, drilled for assembly bolts
Typical Applications
- Belt conveyor drive pulleys with limited hub space
- Industrial sheave and sprocket assemblies
- Machinery requiring frequent pulley changes or maintenance access
- Power transmission systems where quick disconnect is essential for uptime
Compatibility & Replacements
Compatible With
- Martin QD sprockets and sheaves
- Standard conveyor pulley designs using 4-15/16″ bore
- Motors and shafts with 4-15/16″ bores
- Shaft keys sized 1-1/4″ × 5/8″
- Any QD-series power transmission components compatible with NS-style hubs
Replaces / Drop-In Replacement For
Verify exact model compatibility with your system integrator before ordering. The NS 4 15/16 supersedes earlier bushing designs in the Martin QD Short line for applications requiring this bore size and short-hub geometry.
Works With
- Martin QD-series sprockets, sheaves, and pulleys
- Standard belt and chain drive systems
- Industrial conveyor equipment from major OEMs
- Any shaft-mounted rotating components using QD-interface quick-disconnect hubs
