Browning 1128370 Finished Bore Sprocket 20T 1/2in Pitch

Product Description

The BROWNING 1128370 is a finished bore roller chain sprocket designed for use with ANSI 40 chain. It features 20 teeth and a 1/2 inch chain pitch, making it a standard size for a wide range of industrial drive applications. The bore is pre-machined to 1-1/4 inches, eliminating the need for secondary boring operations on the install end. The hub diameter measures 2.641 inches and the outside diameter is 3.45 inches. Constructed from steel, this sprocket is built for durability in moderate to heavy-duty power transmission setups. It is typically installed by maintenance mechanics and industrial technicians in conveyor, drive, and mechanical power transfer systems.

This sprocket is suited for use in industrial power transmission applications requiring ANSI No. 40 single-strand roller chain. Common install scenarios include conveyor drives, pump drives, and general mechanical power transfer equipment in light industrial and manufacturing environments. The finished bore design is ready to mount on a 1-1/4 inch shaft without additional machining, reducing installation time in the field.

Key Features

• 20-tooth configuration with 1/2 inch chain pitch for ANSI 40 chain
• Finished bore at 1-1/4 inches — no secondary machining required
• Hub diameter of 2.641 inches for positive shaft engagement
• Outside diameter of 3.45 inches for compact drive geometry
• Steel construction for durability in industrial power transmission service

Compatibility

Designed as an OEM-style replacement or drop-in sprocket for industrial roller chain drive systems using ANSI No. 40 single-strand chain with a 1/2 inch pitch and a 1-1/4 inch shaft bore requirement.

Installation Notes

Installation is typically performed by qualified maintenance mechanics or millwrights. De-energize and lock out the drive system before removing or mounting any sprocket per OSHA lockout/tagout procedures. Verify shaft diameter and keyway dimensions before pressing or sliding the sprocket onto the shaft. Ensure proper chain alignment and tension after installation to prevent premature wear on the sprocket teeth and chain.