Chrome Vanadium Steel Black Oxide L-Type Hex Key Wrench ISO 2936

L-type wrenches are manufactured from high-quality chrome vanadium steel or specialized alloy steel, undergoing precise heat treatment to achieve optimal hardness typically ranging from HRC48 to HRC52, ensuring durability and resistance to deformation under load. The standard governing metric hex keys is GB/T 5356-2021 in China, which aligns with the international standard ISO 2936:2014. Available surface treatments include chrome plating, black oxide, nickel plating, and phosphate coating, all of which provide corrosion resistance and extended service life. Some variants feature a ball end on the long arm, allowing operation at angles up to 25 to 30 degrees for hard-to-reach applications. Standard metric sizes range from 0.7mm to 36mm, with inch sizes also available. Common applications include bicycle and motorcycle repair, machinery assembly, electronics manufacturing, and automotive engine work.