LD-263 Cr-V Flare Nut Wrench Set Brake Line 5pcs | Wholesale Supplier

The LD-263 Chrome Vanadium Flare Nut Wrench Set is a specialized automotive tool collection designed for tightening and loosening flare nuts on brake lines, fuel lines, hydraulic fittings, refrigeration lines, power steering lines, and HVAC tubing without damaging the soft metal fittings or crushing the tubing. Flare nuts are commonly used in automotive hydraulic and fluid systems where a metal-to-metal flare seal provides a leak-proof connection. Standard box-end wrenches cannot be used because they fully enclose the nut and cannot pass over the connected tubing. Standard open-end wrenches can be used but they only grip two sides of the nut, which can cause the soft brass or aluminum flare nut to round off under torque. The flare nut wrench solves this problem with a 5-point (partial) box-end design that grips five of the six sides of the hexagonal flare nut while leaving one side open to allow the wrench to slip over the tubing. This provides nearly the same grip area as a full box-end wrench, distributing torque across five contact points instead of two, dramatically reducing the risk of rounding off the fitting. The wrenches are drop-forged from premium chrome vanadium (Cr-V) steel and heat-treated to achieve a hardness of HRC 40-48, providing the strength and precision needed for tightening flare nuts to proper torque without distortion. The chrome plating provides corrosion resistance and easy cleaning. The 5-piece set covers the most common metric flare nut sizes used in automotive brake and fuel systems: 8x10mm, 11x13mm, 14x17mm, 15x16mm, and 17x19mm. Each wrench is double-ended with two sizes, providing 10 size options across 5 wrenches. The wrenches are supplied on a red plastic display rack that holds each wrench in place for easy identification and access, or in a blister pack with cardboard backing. The rack design is suitable for both retail display and workshop storage. Whether servicing automotive brake systems, replacing fuel lines, maintaining hydraulic equipment, repairing refrigeration systems, servicing power steering lines, or performing HVAC line work, the LD-263 flare nut wrench set provides the specialized grip needed to safely tighten and loosen flare fittings without damage.