A flare nut wrench is sometimes called a line wrench. Grainger carries flare nut wrenches that can help tighten and loosen fasteners where access is limited, such as air conditioning and refrigeration lines or automotive brake lines. Flare nut wrenches can catch five corners of a six-corner nut and help you apply high torque without damaging the corners of the nut or collapsing a thin-walled tubing flare nut. Check out this large selection to help find the line wrench you need. Choose from ratcheting, combination and regular flare nut wrench types at Grainger!