Klein Tools 640-1/2 Hollow Shaft Nut Driver 1/2 Inch

Product Description

The KLEIN TOOLS 640-1/2 is a hollow shaft nut driver designed for fastening hex nuts in electrical, HVAC, and general trade applications. The hollow shaft design allows the driver to seat over long threaded studs or bolts that extend beyond the nut face, making it useful in panel work and equipment assembly. The 1/2-inch hex drive fits standard 1/2-inch nuts, and the 3-inch shank provides reach in confined spaces. The shank is heat-treated, tempered, and chrome-plated steel for durability and corrosion resistance. A cushion-grip plastic handle in red provides torque comfort during extended use.

This nut driver is suited for residential and commercial electrical work, HVAC equipment servicing, and light industrial maintenance. Electricians commonly use hollow shaft nut drivers when working inside load centers, disconnect boxes, and control panels where bolt threads protrude through the nut. The 1/2-inch size is a standard fastener size on electrical enclosures and HVAC cabinet hardware. The cushion-grip handle reduces hand fatigue during repetitive fastening tasks.

Key Features

• Hollow shaft passes over extended bolt threads for full nut seating
• 1/2-inch hex drive fits standard 1/2-inch nuts
• 3-inch shank length for reach in recessed or tight spaces
• Heat-treated, tempered, chrome-plated steel shank for strength and corrosion resistance
• Cushion-grip red handle for comfort and torque control
• Plastic-dipped shank finish

Compatibility

Designed as a standard 1/2-inch hollow shaft nut driver suitable for electrical panel work, HVAC equipment service, and general trade fastening applications requiring clearance over protruding bolt threads.

Installation Notes

De-energize all electrical equipment and follow lockout/tagout procedures before servicing panels or equipment interiors. This tool is intended for manual hand use only and should not be used with power drivers or impact tools. NEC guidelines require appropriate personal protective equipment when working inside energized or recently de-energized enclosures.

Technical Specifications

• Drive Size: 1/2 inch hex
• Shank Length: 3 inches
• Shank Material: Heat-treated tempered chrome-plated steel
• Handle Material: Plastic cushion grip
• Handle Color: Red
• Shaft Type: Hollow
• Weight: 0.39 pounds
• UPC: 092644650277

Standard Information

• Brand: KLEIN TOOLS
• Manufacturer Part Number: 640-1/2