Martin Hi-Cap® 3V Sheave (MST® Bushed) sheaves are precision-machined power transmission components designed for 3V V-belt drive systems. Every Martin sheave is manufactured from high-strength cast iron, dynamically balanced to reduce vibration, and machined to MPTA standards for groove dimensions and concentricity. The MST® bushing mount provides a secure, concentric shaft connection with easy installation and removal for fast maintenance.

Proper sheave selection is critical to belt life and drive efficiency. An undersized sheave increases belt bending stress and generates excess heat, while an oversized sheave wastes space and adds unnecessary weight. Match the sheave pitch diameter to your drive design, verify the groove profile matches your belt section (3V), and select a bushing bore that fits your shaft diameter. Martin’s comprehensive sheave line ensures exact matches for professional power transmission applications.

Available in 168 configurations covering a range of groove counts and outside diameters. Each sheave requires a separate MST® bushing (sold separately) matched to your shaft bore size.

• 3V Wedge Belt Section — narrow profile for higher speed and horsepower
• Hi-Cap Groove Design — deeper contact for superior belt grip
• MST® Bushing Mount — compact mounting for limited-space applications
• Cast Iron Construction — high strength, excellent vibration damping
• Dynamically Balanced — smooth operation at rated speeds
• MPTA Standards — groove dimensions per industry specifications
• Bushing Sold Separately — select bore to match your shaft