-12 Steel Wrench

The -12 Steel Wrench is a professional-grade AN wrench engineered for fluid system assembly and maintenance in high-performance automotive, aerospace, and industrial applications. Designed by Allstar Performance, this single-end wrench fits 12 AN (dash-12) fittings—the standard size used in fuel lines, brake systems, and hydraulic assemblies where precision fitment and leak-free connections are critical. Whether you're building a custom engine bay, servicing racing fuel systems, or working on aircraft hydraulics, this wrench delivers the specific fitment needed to avoid stripping or cross-threading delicate aluminum fittings.

Constructed from steel with a rubber-coated handle, the -12 Steel Wrench combines durability with user comfort during extended work sessions. The rubber grip reduces hand fatigue and provides secure purchase even when hands are wet or oiled, a feature essential in engine shops and pit environments. The single-end design keeps the tool compact and focused—at 12.05 inches in length and weighing just 0.41 lbs, it's light enough for detailed work yet rigid enough to apply the torque necessary for tight AN connections without flexing or slipping. Black powder-coat finish resists corrosion and blends seamlessly into professional tool collections.

Technicians, engine builders, and motorsports enthusiasts rely on this wrench wherever 12 AN adapters, fittings, and bulkhead connectors appear. It is particularly valuable in fuel system tuning, transmission cooler installation, and boost system assembly—tasks where the wrong wrench size risks expensive aluminum fitting damage. Pair this wrench with other AN sizes in your toolkit to ensure you're always prepared for professional-grade fluid system work.