1, function: a mechanical transmission, the key to peace, the semicircular key, the oblique keyrole, is the transfer of mechanical torque,

2, structure: a longitudinal keyway in the shaft surface, set rotating parts on the shaft also havecorresponding keyway, can be maintained with axis synchronous rotating. In turn, some can make a longitudinal sliding on the shaft, such as transmission shift gear etc..

3, application: in brake, steering mechanism. There is a telescopic shaft, composed of inner and outer tube, the outer tube with inner teeth, inner tube outer teeth, set together. When used in the transmission of torque at the same time, in the length direction can be telescopic.

4, material: 40Cr

5, heat treatment. The quenched surface hardness of HRC45--50