U.s. Tsubaki 50BB15H Chain Idler Sprocket 15 Tooth

Product Description

The U.S. TSUBAKI 50BB15H is a chain idler sprocket engineered for use with No. 50 roller chain. It carries 15 teeth and measures 3.21 inches in outside diameter, with a bore diameter of 0.638 inches. Constructed from carbon steel, this sprocket is built to handle the tensioning and guiding demands of industrial and mechanical drive systems. Ball bearing support is integrated into the hub, allowing the sprocket to rotate freely as an idler without requiring a keyed shaft connection. Licensed technicians and mechanical tradespeople install this component in conveyor, HVAC equipment drive, and power transmission assemblies.

This idler sprocket is suited for applications where No. 50 roller chain must be kept under consistent tension or redirected along a drive path. Common installation scenarios include conveyor systems, pump drives, fan drives, and other light-to-medium-duty industrial power transmission setups where an idler point is required to control chain slack or route chain around obstacles. The compact 3.21-inch outside diameter makes it appropriate for space-constrained drive configurations.

Key Features

• Designed for No. 50 roller chain - matches standard 50 chain pitch and width
• 15-tooth count provides smooth engagement and controlled chain wrap angle
• Ball bearing design allows free rotation for true idler function
• Carbon steel construction offers durability in moderate-load drive environments
• 0.638-inch bore diameter accommodates standard idler shaft sizes
• 3.21-inch outside diameter fits compact drive layouts

Compatibility

Designed as an OEM-style idler sprocket replacement for No. 50 roller chain drive systems in industrial, HVAC equipment, and mechanical power transmission applications.

Installation Notes

Installation is performed by qualified mechanical or millwright tradespeople. Before servicing any chain drive, de-energize the equipment and lock out the power source per OSHA lockout/tagout procedures. Verify the shaft diameter matches the 0.638-inch bore before mounting, and ensure the sprocket is properly aligned with the drive and driven sprockets to prevent accelerated wear. Do not force the sprocket onto an oversized shaft.