Causes of damage to the thread

This happens from time to time in the pressure gauges returned by the user. The thermal resistance cannot be installed due to the damage of the thread of the large buckle of the gauge connector, so that the gauge loses the value of repair and can only be scrapped. .
1. If the thread of the joint has been screwed, the buckle tip will be ground flat. The outer diameter and middle diameter of the stainless steel pressure gauge thread are much smaller than the specified size. If this type of pressure gauge continues to be used, accidents may occur. The pressure gauge joint is large. The damage in this case of thread fastening is caused by incorrect repeated installation and removal of the meter. If it is installed and removed multiple times under normal circumstances, this situation should not happen. This may be related to the accelerated wear of the stainless steel pressure gauge by excessive force in order to adjust to a certain observation angle during the installation process.
2. The bottom buckle of the joint thread has been completely bald, which is caused by a typical "rude" operation method. The joint on the pressure gauge is a taper thread, and the sealed thermal resistance of the NPT taper thread can generally be directly tightened and sealed, or it can be sealed by wrapping raw tape or applying sealant. Judging from the damage of the large buckle of the joint, the size of the inner buckle of the mating connector may be small. If it is forced to be screwed in with too much force, the thread of the large buckle will be bald and damaged.