Proto J4912HFL Flare Nut Crowfoot Wrench 3/8 Inch

Product Description

The PROTO J4912HFL is a 3/8-inch flare nut crowfoot wrench designed for use on flare fittings and line nuts in tight or awkward spaces where a standard open-end wrench cannot get proper purchase. The 6-point contact pattern distributes load evenly across the fitting, reducing the risk of rounding. A chrome-plated finish resists corrosion and simplifies cleanup after service. With an overall length of 1.81 inches and a head thickness of 0.25 inches, this wrench fits into confined areas common in HVAC refrigerant line work, plumbing rough-in, and brake line service. It is intended for use with a 3/8-inch drive ratchet or extension.

This crowfoot wrench is suited for HVAC technicians, plumbers, and automotive service professionals working on flare-type fittings in restricted access locations. The slim 0.25-inch head thickness is particularly useful when working around manifolds, bulkheads, or other obstructions that prevent a box or open-end wrench from seating fully. The 29/32-inch head diameter accommodates the wrench opening and keeps the tool compact for use in close quarters.

Key Features

• 3/8-inch wrench size for flare nuts and line fittings
• 6-point engagement reduces fastener rounding under load
• Chrome-plated finish for corrosion resistance and easy cleaning
• Head thickness of 0.25 inches allows access in tight clearances
• Meets ASME B107.21 and Federal Spec GGG-C-1507b standards
• Accepts standard 3/8-inch drive ratchets and extensions

Compatibility

Designed for use with 3/8-inch flare nuts and line fittings; accepts any standard 3/8-inch square drive ratchet or extension.

Installation Notes

Always depressurize refrigerant lines or shut off water supply before loosening or tightening flare fittings. Seat the crowfoot squarely on the fitting before applying torque to avoid slippage and fitting damage. A licensed HVAC technician or plumber should perform work on pressurized refrigerant or water lines in accordance with applicable codes. Inspect chrome finish before each use and replace the tool if cracking or peeling is observed.