Klein Tools 640-9/16 Hollow Shaft Nut Driver 9/16 Inch

Product Description

The KLEIN TOOLS 640-9/16 is a hollow shaft nut driver built for trade professionals who need reach and control in tight fastening applications. The 9/16-inch drive size pairs with a 4-inch shank length to give technicians access to deep-set nuts and bolts without interference from threaded rod or long fasteners extending through. The shank is heat-treated, tempered, chrome-plated steel, and the handle is a cushion-grip design with an orange plastic dipped finish for secure handling during extended use. This is a hand tool intended for HVAC, electrical, and mechanical service work.

This nut driver is suited for residential and light commercial service environments where a 9/16-inch fastener is common. HVAC technicians, electricians, and plumbers reach for hollow shaft drivers when working with long machine screws or threaded studs. The 4-inch shank provides enough clearance for panel work, equipment access covers, and equipment mounting hardware without requiring a socket set or ratchet.

Key Features

• Hollow shaft design accommodates long threaded fasteners and studs
• 9/16-inch drive size for common trade fastener applications
• 4-inch heat-treated, tempered, chrome-plated steel shank
• Cushion-grip orange plastic handle for comfort and control
• Plastic-dipped shank finish for corrosion resistance

Compatibility

Designed for general-purpose use with 9/16-inch hex fasteners in HVAC, electrical, and mechanical service applications where a hollow shaft nut driver is required.

Installation Notes

Always de-energize electrical panels and equipment before using hand tools in live work areas in accordance with applicable NFPA 70E safe work practice guidelines. Confirm the drive size matches the fastener head before applying torque to avoid rounding. Inspect the shank and handle for damage before each use and remove the tool from service if cracking or deformation is observed.

Technical Specifications

• Drive Size: 9/16 inch
• Shank Length: 4 inches
• Shaft Type: Hollow
• Shank Material: Heat-treated tempered chrome-plated steel
• Handle Material: Plastic
• Handle Type: Cushion grip
• Handle Color: Orange
• Weight: 0.6 pounds

Standard Information

• Brand: KLEIN TOOLS
• Manufacturer Part Number: 640-9/16