Martin bushings are precision-machined components that provide a secure, concentric connection between shafts and power transmission components like sheaves, sprockets, and couplings. The taper-lock or QD (Quick Detachable) design allows easy installation and removal without disturbing the position of the driven component on the shaft — a massive time saver during maintenance.

Martin has been manufacturing bushings and power transmission components in the United States since 1928. Every bushing is machined from high-strength steel or cast iron, with bore tolerances held tight enough to ensure zero wobble at operating speed. The split-taper design creates a uniform clamping force around the shaft, eliminating the stress concentrations that cause setscrew-mounted components to slip or damage shafts.

Available in 360 bore sizes (QD-STD-JA-3/8, QD-STD-JA-7/16, QD-STD-JA-1/2, QD-STD-JA-9/16, QD-STD-JA-5/8 and 355 more) to match your shaft and component requirements.

• Precision Machined — bore tolerances ensure zero wobble at operating speed
• Split-Taper Design — uniform clamping force without shaft damage
• Quick Detachable — easy installation and removal for fast maintenance
• High-Strength Steel — rated for full-load power transmission applications
• USA Heritage — Martin Sprocket & Gear, manufacturing since 1928