Proto J111820L Box End Wrench 9/16 X 5/8 in 12 Pt Double End

Product Description

The PROTO J111820L is a double-end box wrench sized 9/16 inches by 5/8 inches, designed for professional-grade fastener work in mechanical, industrial, and trade applications. Built from steel with a polished finish, it features 12-point box ends on both sides, allowing engagement of hex fasteners from multiple positions. At 12.48 inches in length and 0.56 pounds, it provides solid leverage without excessive bulk. The 12-point geometry suits both standard hex and 12-point fastener heads. Licensed mechanics, pipefitters, HVAC technicians, and electricians reach for this style of wrench when a ratchet or open-end tool is not practical in tight quarters.

This wrench is suited for residential and commercial maintenance, equipment assembly, and service work where controlled torque on a fixed fastener is required. The double-end configuration gives the technician two size options in a single tool, reducing the number of wrenches needed on the job. The polished steel finish resists surface corrosion under normal shop and field conditions. It meets ASME B107.10 standards, making it appropriate for professional toolsets that must conform to recognized hand-tool specifications.

Key Features

• Double-end box wrench with 9/16-inch and 5/8-inch openings in one tool
• 12-point box ends engage standard hex and 12-point fastener heads
• Polished steel construction meets ASME B107.10 hand-tool standards
• Non-ratcheting design provides direct, positive torque transfer
• Lifetime warranty coverage from the manufacturer
• Compact profile at 0.47 inches height and 0.83 inches width for access in confined spaces

Compatibility

Designed as a standard double-end box wrench for use with 9/16-inch and 5/8-inch hex fasteners commonly found in mechanical, HVAC, plumbing, and electrical equipment.

Installation Notes

This wrench is a hand tool intended for use by any trade professional working with threaded fasteners. Ensure the correct size end is fully seated on the fastener before applying force to avoid rounding the fastener head. Always de-energize equipment and relieve system pressure before breaking fasteners on live electrical, fluid, or refrigerant-bearing components. No power tools or calibration equipment are required for use.