Proto JN0404RMS Hollow Shaft Nut Driver 4 Mm

Product Description

The PROTO JN0404RMS is a hollow shaft nut driver designed for driving hex nuts and fasteners in tight or deep-reach applications. The hollow shaft design allows the tool to slide over threaded rod or stud ends, making it especially useful where standard closed-end drivers cannot seat. The ergonomic handle promotes a secure, comfortable grip during extended use. With an overall length of 8.25 inches and a blade length of 4 inches, this driver delivers the reach needed for recessed fastener work. It meets ANSI specification B107.12. HVAC technicians, electricians, and plumbers use this type of driver regularly during panel work, equipment installation, and service calls.

The JN0404RMS is suited for residential and light commercial service work where 4 mm hex fasteners are common. Typical applications include HVAC equipment assembly, electrical panel and control box work, and plumbing fixture installation. The hollow shaft is particularly useful when a fastener sits on a protruding threaded rod, allowing full seating without interference. Packaged individually, this driver ships in a pouch for field or van storage.

Key Features

• Hollow shaft allows use over threaded rod or protruding studs
• 4 mm drive size for metric hex fasteners
• 8.25-inch overall length with 4-inch blade for extended reach
• Ergonomic handle provides grip comfort during sustained torque
• Meets ANSI B107.12 specification
• Lifetime warranty from PROTO

Compatibility

Designed for use with 4 mm hex nuts and fasteners in standard metric applications across HVAC, electrical, and plumbing service work.

Installation Notes

This tool is used by licensed HVAC technicians, electricians, and plumbers during equipment installation and maintenance. Always de-energize electrical equipment and shut off relevant systems before accessing fasteners inside panels or control boxes. Use the correct drive size to avoid rounding fastener heads. Inspect the driver for wear or damage before each use.