Why do Fasteners Have "Reverse Deduction"?

In daily life, many small friends will find that when they loosen the screws, the more they tighten, the more they try to find that some screws are loosened counterclockwise. Why is this happening? The reason is that the screws have positive and negative threads The points of silk can also be called positive buckle and reverse buckle.

Positive buckle is common, tighten clockwise and loosen counterclockwise, while the application of reverse buckle is less, and the tightening method is opposite to positive buckle. Reverse screws are generally made according to needs and requirements, usually to prevent reverse. According to the direction of rotation, it is less likely to cause torque attenuation and more reliable than the right-hand screw.

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The scientific name of the anti-buckle is "left-handed screw". As the name implies, it is the thread that is opposite to the normal fastener thread, also called "reverse thread". The normal fastener thread is tightened clockwise, and the reverse fastener is tightened It is counterclockwise, and when it is loosened, it is clockwise. Why are there "reverse" fasteners? What mechanical equipment is generally used for "reverse" fasteners? Today Hook Bolt Manufacturer click on the "Reverse Buckle" fastener.

Reverse fasteners are usually used on rotating mechanical equipment, such as fan blades, impellers in electric motors, vertical mills, pedals on the left side of bicycles, and air-conditioning fan impellers. There are also "left-hand screws" rarely used for safety, such as flammable gas tank pressure relief valves.

Taking the vertical mill as an example, when the mill is started, the spindle rotates clockwise, and at the same time drives the grinding wheel and lock nut to rotate.The grinding wheel and lock nut will give the spindle a counterclockwise rotation force due to inertia.The grinding wheel has a larger diameter Therefore, the inertial force is also large. The inertial force of the grinding wheel is transmitted to the nut through friction. The nut will become tighter under the dual action of its own inertial force and the inertial force of the grinding wheel. If the left spindle is a positive buckle, the grinding wheel will loosen itself due to inertial force.

Dangerous tanks such as gas tanks are also counter-buckles, in order to prevent unintentional persons from opening and causing danger. We must also develop a habit. When the screw cannot be loosened according to the habit, and even tightened, the screw switch should not be opened casually, and the operation should be carried out after understanding the situation.

By default, the thread is screwed in when rotating clockwise. If it is turned counterclockwise (left-handed), it must be explained. In addition to marking LH in the thread specification, the description method can be described in the name, such as left-hand thread and reverse screw. The method for identifying left-handed and right-handed threads is to stand the screw upright and observe the direction of the thread. The left-handed thread is left high and the right is low, and the right-handed thread is right high and left is low. Our company also has Clip Bolts for sale, please contact us.