Browning 1881218 Finished Bore Sprocket 23 Teeth

Product Description

The BROWNING 1881218 is a finished bore sprocket designed for use with ANSI 50 roller chain at a 5/8 inch pitch. Machined from steel, this sprocket features 23 teeth and a fixed bore diameter of 1-3/16 inches, meaning the bore is already finished to size at the factory with no additional machining required. The outside diameter measures 4.92 inches. It is used in power transmission assemblies across industrial, commercial, and mechanical systems where roller chain drives transfer rotational motion between shafts. Installation is typically performed by millwrights, maintenance mechanics, or experienced power transmission technicians.

This sprocket is suited for roller chain drive applications in conveyor systems, packaging equipment, agricultural machinery, HVAC mechanical drives, and general industrial equipment. The 50-chain trade size is one of the most common ANSI chain sizes, making this sprocket a straightforward replacement or new-build component for a wide range of fixed-bore shaft drive setups. The 1-3/16 inch bore is both the minimum and maximum bore diameter, so verify shaft diameter before ordering.

Key Features

• Finished bore at 1-3/16 inches — no secondary machining required
• 23 teeth with 5/8 inch chain pitch, compatible with ANSI 50 roller chain
• Outside diameter of 4.92 inches
• Steel construction for durability in industrial power transmission environments
• Single-piece factory finish suitable for drop-in shaft installations

Compatibility

Designed for use with ANSI 50 roller chain at 5/8 inch pitch. Intended for shafts with a diameter of exactly 1-3/16 inches. Verify chain trade size and shaft diameter before installation, as this is a fixed finished bore sprocket with no bore adjustment range.

Installation Notes

Installation should be performed by a qualified millwright or mechanical technician. Always de-energize and lock out the drive system before removing or installing sprockets. Ensure the shaft is clean and free of burrs before pressing or sliding the sprocket into position. Align the sprocket with its mating component using a straightedge or laser alignment tool to minimize chain wear and lateral load on bearings.