Proto J3112M Open End Wrench 12 Mm Double End

Product Description

The PROTO J3112M is a double-ended open end wrench sized at 12 mm, built for professional-grade fastener work in mechanical, HVAC, plumbing, and industrial service applications. The wrench is forged from steel with a chrome-plated finish that resists corrosion and simplifies cleanup in the field. Both heads are offset at 15 and 60 degree angles, giving technicians clearance to work in tight fastener access points without removing the tool from the fastener. At 5 inches in length and 0.1 pounds, it fits easily in a tool pouch or roll and handles the repetitive torque demands of daily trade use.

This wrench is suited for residential and commercial mechanical service work where metric fasteners are common. HVAC technicians, pipefitters, and general maintenance mechanics reach for double-ended open end wrenches when socket access is blocked or when working on hex fasteners on equipment panels, refrigerant line fittings, and piping connections. The 12 mm size covers a wide range of metric hardware found on equipment manufactured to European and Asian standards.

Key Features

• Double-ended design provides two working heads on a single tool
• 15 and 60 degree head angles for clearance in confined fastener locations
• Chrome-plated steel construction for corrosion resistance and durability
• Head width of 45/64 inches fits standard 12 mm metric fasteners
• Meets GGG-W-636E federal specification standards
• Backed by a lifetime warranty from PROTO

Compatibility

Designed as an OEM-style replacement or addition for professional metric hand tool sets requiring a double-ended open end wrench in the 12 mm size range.

Installation Notes

This wrench is installed and used by licensed mechanics, HVAC technicians, plumbers, and electricians as part of standard hand tool service procedures. Always select the correct wrench size for the fastener to avoid rounding hex flats. Do not use a cheater bar or extension on an open end wrench, as this can damage the tool or fastener. Keep the chrome finish clean and dry to extend service life.