Lennox 49K40 – Browning BK77X1 cast iron finished bore pulley is a high-quality OEM replacement component designed for dependable belt-drive operation in HVAC systems. Manufactured by Browning and supplied under the Lennox part number 49K40, this pulley is built to deliver smooth power transmission, reduced vibration, and long service life in demanding residential and commercial applications.

This pulley features a 7.45 inch outside diameter with a single-groove configuration, making it ideal for use with standard V-belts in air handlers, furnaces, and other HVAC drive assemblies. The 1 inch finished bore allows for precise shaft fitment, ensuring proper alignment and secure mounting without additional machining. Its heavy-duty cast iron construction provides excellent strength, wear resistance, and stability under continuous operation.

Designed for technicians and contractors who require reliable OEM-grade parts, the Lennox 49K40 pulley helps maintain correct belt speed ratios, efficient motor performance, and consistent airflow. It is well suited for maintenance, repair, or replacement of worn or damaged pulleys to restore proper system operation.

Specifications:

Brand: Browning
Lennox Catalog Number: 49K40
Manufacturer Part Number: BK77X1
Pulley Type: Finished bore pulley
Material: Cast iron
Outside Diameter: 7.45 inch
Grooves: 1
Bore Size: 1 inch
Application: HVAC belt-drive systems, air handlers, furnaces, commercial and residential equipment

The Lennox 49K40 Browning BK77X1 cast iron pulley is a dependable choice for HVAC professionals looking for an accurate fit, durable construction, and OEM-level performance in belt-driven HVAC equipment.