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What are the causes and countermeasures of stainless steel screw locking

Release time：

2023-03-06 08:20

When assembling stainless steel bolts and nuts, we often lock them. What is locking?
Locking, also known as bite, refers to the phenomenon that bolts and nuts are stuck and locked during tightening. It usually occurs between stainless steel bolts and stainless steel nuts, so it is also called stainless steel screw locking or stainless steel screw locking. Why does locking occur? The reasons are as follows:

1. Excessive locking force and low thermal conductivity of stainless steel can easily lead to thread locking. The stainless steel nut is heated due to friction during rotation. The thermal conductivity of stainless steel is relatively low. When the generated pressure and heat destroy the chromium oxide layer (the oxide layer of stainless steel that is not easy to rust), the metal tooth will directly block/shear, and the stainless steel will become soft. Adhesion. The greater the tightening force, the greater the heat generated, and the more likely the stainless steel of the screw shank will produce adhesion.

2. The inclination angle of thread matching and the soft characteristics of stainless steel may cause jamming. During installation, uneven force or inclination will make the inclination of the central shaft of the screw and nut larger, which may damage the tooth profile and cause the bite lock; If iron is rubbed during locking, the hardness of stainless steel screw is relatively soft. The chips will stick without falling, thus interfering with the smooth entry and exit of the thread, resulting in the death of the bottom and top of the teeth.
How to avoid locking of stainless steel screws?

The main countermeasures are as follows:
1. Make the central axis of the screw and nut perpendicular to the surface to be locked. To reduce the inclination of the central axis of the screw and nut.
2. Use torque wrench or socket wrench as much as possible; To avoid excessive force. The torque shall be controlled within the safe reserve torque range.
3. Try not to use an electric wrench, but use a manual wrench to reduce the locking speed. Keep threads clean, reduce heat and reduce adhesion.
4. Select anti-lock products or use anti-lock lubricant to reduce friction and avoid jamming.
5. Select screws and nuts of different materials to use together; To avoid adhesion of the same material.

Not have

Screws and nuts: no matter how serious the rust is, please loosen them

Not have

Screws and nuts: no matter how serious the rust is, please loosen them

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Application range of T-shaped screw

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Zhejiang screw manufacturer will show you the application of T-shaped screw

T-shaped screw is a device that can be used to connect some nuts. T-type screw rod has extremely important applications in industry. It can not only be used as a connection button for some pipes, but also be used for the installation and connection of some instruments, both of which play a very important role. The Zhejiang screw manufacturer will take you to understand the application of T-shaped screw. The T-shaped screw is directly placed in the special-shaped groove. It can be automatically positioned and locked during installation.

2023-03-06

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