Browning 1881051 Finished Bore Sprocket 21T 5/8in Pitch

Product Description

The BROWNING 1881051 is a finished bore sprocket designed for use with ANSI No. 50 roller chain. It features 21 teeth and a 5/8-inch chain pitch, with a fixed bore diameter of 1-3/16 inches ready for direct shaft installation without additional machining. The sprocket is manufactured from steel for durability in moderate-to-heavy power transmission applications. With an outside diameter of 4.52 inches and a finished bore, this component is suited for mechanical power transmission systems found in industrial equipment, conveyor drives, and HVAC auxiliary machinery. Installation is handled by mechanical and industrial maintenance technicians.

This sprocket is intended for use in roller chain drive assemblies requiring ANSI No. 50 chain with a 0.625-inch pitch. Typical applications include conveyor systems, pump drives, compressor drives, and other mechanical power transmission setups where a 21-tooth finished bore sprocket is specified. The fixed bore diameter of 1-3/16 inches limits shaft compatibility, so shaft size must be confirmed before installation. No secondary boring or broaching is required, making this a drop-in replacement in matching drive configurations.

Key Features

• Finished bore at 1-3/16 inches — no additional machining required for shaft fitment
• 21-tooth profile compatible with ANSI No. 50 roller chain at 5/8-inch pitch
• Steel construction for strength and wear resistance in power transmission service
• Outside diameter of 4.52 inches suits standard sprocket drive envelopes
• Single-piece construction with fixed bore diameter — bore is both minimum and maximum

Compatibility

Designed for use with ANSI No. 50 roller chain with a 5/8-inch pitch. Shaft diameter must match the finished bore of 1-3/16 inches exactly. Confirm chain trade size and bore requirements before ordering.

Installation Notes

Installation is typically performed by a qualified millwright or mechanical maintenance technician. Disengage and lock out all power to the drive system before removing or installing sprockets. Verify shaft diameter matches the 1-3/16-inch finished bore before installation, and ensure proper chain alignment and tension per the drive system manufacturer guidelines after mounting. A setscrew or keyway arrangement is typically used to secure the sprocket to the shaft — confirm the bore configuration before installation.