The Hexagon Socket Screw Can Go/no Go Gauge, But It Does Not Work After Heat Treatment

Internal hex socket screws are a common type of fastener, commonly used in situations that require high torque or need to prevent loosening. The head of the hexagon socket screw has six hexagonal grooves and can be used in conjunction with a hex wrench or wrench. However, after heat treatment, the grooves of the hexagon socket screws may deform or become unobstructed.

Heat treatment is a method of changing the properties and microstructure of metal materials through heating and cooling processes. During the heat treatment process, the material of the hexagon socket screw will undergo phase transformation and structural changes, which may lead to changes in the shape and size of the groove.

One possible reason is that the high temperature and cooling process during heat treatment cause stress concentration and deformation of the grooves on the screw head. High temperature and rapid cooling may cause thermal stress and residual stress on the screw head, leading to plastic deformation or plastic flow in the groove. This will result in the irregular shape of the grooves, which are no longer suitable for use with hex wrenches or wrenches.

In addition, phase transitions during heat treatment may also affect the versatility of grooves. For example, in some cases, heat treatment may lead to grain growth or changes in grain boundaries, thereby affecting the size and shape of grooves. This may cause the groove of the hex socket screw to no longer match perfectly with the hex wrench or wrench, making it unusable.

Therefore, heat treatment can have an impact on the grooves of the hexagon socket screws, which may lead to groove deformation, inaccurate dimensions, or inability to be universal. To avoid this situation, it is necessary to pay attention to selecting suitable materials and heat treatment processes when producing and using hex socket head screws to ensure that the grooves on the screw head maintain good shape and versatility.