Proto JK51604RF Slotted Screwdriver 5/16 in Keystone

Product Description

The PROTO JK51604RF is a keystone-tip slotted screwdriver built for professional tradespeople who need a reliable, full-size flathead driver for everyday service work. The blade measures 4 inches in length and 5/16 inch in width, with a blade thickness of 0.042 inch for solid engagement in standard slotted fasteners. Overall length is 8.5 inches, and the round shank design allows a wrench to be applied for added torque when breaking loose stubborn fasteners. An ergonomic handle spanning 4.5 inches provides a comfortable, secure grip during extended use. At 0.3 pounds, the tool is lightweight enough for overhead or confined-space work without sacrificing control.

This screwdriver is suited for HVAC technicians, electricians, plumbers, and general maintenance professionals working on equipment panels, junction boxes, terminal strips, and mechanical assemblies. The keystone blade profile fits a wide range of standard slotted screw heads commonly found in residential and commercial trade applications. The round shank construction is a practical choice where additional leverage with an adjustable wrench is needed on the job.

Key Features

• Keystone tip profile for broad contact and torque transfer on standard slotted fasteners
• Round shank allows wrench engagement for increased torque on seized fasteners
• 4 inch blade length with 5/16 inch width for a versatile fit across common screw sizes
• Ergonomic handle design reduces hand fatigue during extended use
• Full 8.5 inch overall length provides reach in deep or recessed fastener locations
• Lightweight at 0.3 pounds for comfortable use in overhead or confined-space applications

Compatibility

Designed for use with standard slotted fasteners across residential and commercial trade applications including HVAC equipment panels, electrical enclosures, and plumbing fixtures.

Installation Notes

This tool is intended for use by licensed tradespeople familiar with hand tool safety practices. Ensure the blade tip is fully seated in the fastener slot before applying torque to avoid cam-out or fastener damage. Do not use a damaged or worn tip, as it may slip and cause injury. When applying a wrench to the round shank for additional leverage, use a properly sized adjustable or open-end wrench and work carefully to avoid overloading the fastener.