Hexagon Key

Good-quality hexagon keys are made from strong alloy tool steel, usually Chrome Vanadium (Cr-V) or Chromium Molybdenum (Cr-Mo). They heat-treat these materials to get a good balance of hardness and strength.The hexagonal edge and guide tip have high hardness (about HRC 50-60) and are not easy to wear, and the whole tool is tough enough to withstand sufficient torque without twisting or breaking. It will not be easily damaged under harsh environmental conditions and frequent use, and can be used for a long time and is relatively durable.

Coating

To help hexagon keys with pilot work better and last longer, they often get a special coating. The usual one is a dull black finish,that's the black oxide treatment. This coating does a few basic jobs: it fights off rust a bit, stops the tool from being too shiny and glaring, and helps oil or grease stick to it.

There are also more coating options for these wrenches that are a bit more sophisticated, such as gold titanium nitride or purple or black aluminum titanium nitride. These tougher coatings give the socket head wrenches a harder surface. These tools wear slower, slide less easily (less friction), and resist rust and other contaminants better. These coatings can extend the life of the tool in very harsh environmental conditions.

Is it suitable for all types of hex socket screws?

Xiaoguo®'s hexagon keys are made to work with screws that have a small hole or bevel at the top for the pilot tip to fit into. They’re commonly used with DIN/ISO 7380-1 button head screws and can work with other pilot-point socket screws too. But they won’t work with regular hex socket screws (like DIN/ISO 4762) that don’t have that pilot feature.If you try, the pilot tip will block the hex part from fully fitting into the screw’s socket. Always make sure the screw you’re using actually has a pilot hole or chamfer before grabbing these keys.