Selection of hardware tools, multiple Angle demand factors, such as the workpiece material and machining tool material, rough machining, essence (etc), must according to the circumstance reasonable choose carefully. General speaking, the tool manufacture and measuring the annotation Angle in theory, due to the obligations of the cutter location and cutting movement direction changes, the theory of the task of Angle Angle and differences, but usually are small.

Carbide rotating blades are now using chemical vapor deposition coated with titanium and titanium carbide nitride, alumina hard layer or composite hard layer. Is the physical method not only can breath together for cemented carbide cutting tools, also can be used for high speed steel paper cutting knife, such as drills, hob, taps and milling, etc. Hard coating as obstruction of the heat and chemical together, make the barrier of cutting blades slowed, wear the life and coating of coating is about 1 ~ 3 times more progress.

Manufacturing hardware tools material must be high hardness and high wear resistance, the necessary flexural strength, impact toughness, good chemistry and inert, forging process (machining and heat treatment, etc.), and deformation.

Polycrystalline cubic boron nitride applicable to cutting high hardness hardened steel and iron, etc.; hard Polycrystalline diamond cutting not applicable iron metal, plastic and glass and alloy, etc, Carbon steel and alloy steel now only be used for the file, self-tapping and taps, etc.

Usually when the hardness, wear resistance when the material is high, Bending strength, impact toughness is high. But higher hardness materials, the flexural strength and impact toughness is low. HSS because of high bending strength and impact toughness and good processability, now still is one of the most widely used metal tool materials, secondly is cemented carbides.