The Lennox Y3864, equivalent to the Klein 646-1/4M Magnetic Hex Nut Driver, is a high-performance 1/4-inch nut driver designed for HVAC technicians who require reliable fastening access in tight or recessed areas. This tool features a 6-inch hollow shaft that accommodates long bolts and threaded rod, while the strong magnetic tip securely holds fasteners in place for improved efficiency during HVAC system installations, service calls, and electrical applications.

Manufactured by Klein Tools, a trusted name in professional-grade hand tools, the 646-1/4M driver provides exceptional torque, durability, and comfort. Its cushion-grip handle reduces user fatigue, making it ideal for frequent field use. Whether you're servicing a Lennox air handler, adjusting sheet metal screws, or installing a control panel, this magnetic nut driver delivers precision, reach, and reliability.

This Lennox-branded listing ensures compatibility with HVAC service requirements while offering the proven quality and performance technicians expect from Klein.

 

Key Features:

 

• Magnetic 1/4-inch hex tip securely holds fasteners
• Long 6-inch hollow shaft for recessed or extended-length bolts
• Designed for HVAC, electrical, and mechanical service tasks
• Cushion-grip handle for comfort and higher torque
• Precision machined for consistent fastening and long tool life
• Trusted Klein Tools performance used throughout the HVAC industry
• Lennox Y3864 cross-reference to Klein 646-1/4M for accurate part identification

 

Specifications:

 

• Tip Size: 1/4 inch
• Shaft Length: 6 inches
• Shaft Type: Hollow, magnetic
• Handle Type: Cushion-grip
• Manufacturer Cross Reference: Klein 646-1/4M
• Lennox Part Number: Y3864