Once the bolt connections in mechanical equipment are loose, it will cause the bolts to fall off and cause major safety hazards, or the pretightening force of the loose bolts will be reduced, which will greatly shorten the fatigue life of the bolt connections. Therefore, appropriate anti-loosening measures should be used in the design to ensure that the bolts do not loosen in actual use.

Commonly used anti-loosening measures in design include the following:

01

Double nut

Double nut anti-loosening is also called a pair of anti-loosening measures. The top nut is anti-loosening. When the two top nuts are tightened, there is always an interactive pressure between the two top nuts. If any one of the two nuts wants to rotate, it needs to overcome the friction between the screw threads. Even if the external load changes, the pressure between the top nuts always exists, so it can have a relaxing effect.

02

Self-locking nuts

Self-locking nuts generally rely on friction. The principle is to press into the preset holes in the sheet metal through embossed teeth. , the diameter of the general square preset hole is slightly smaller than that of the pressure rivet nut. Use a nut to connect to the locking mechanism. When the nut is tightened, the locking mechanism locks the bolt thread.

Built-in nylon self-locking nut

Deformed thread anti-loosening nut

Wedge and hammer two-in-one nut

The wedge functions to prevent Loose nut

03

Thread locking adhesive

Thread locking adhesive is composed of (meth)acrylate, initiator, accelerator and stabilizer An adhesive composed of (polymerization inhibitor), dyes and fillers in a certain proportion.

04

Cotter pin

After tightening the nut, insert the cotter pin into the nut groove and the bolt tail hole, and open the tail of the cotter pin to prevent the nut from Relative rotation with the bolt

05

Slotted nut

The slotted nut is used with the screw hole bolt and cotter pin to prevent the bolt from facing the nut. Turn.

06

Series steel wire anti-loosening

Series steel wire anti-loosening is to penetrate the steel wire into the hole of the bolt head and connect the bolts in series to achieve the purpose of mutual restraint. This way of relaxing is very reliable, but disassembly is cumbersome.

07

Preloading

High-strength bolted connections generally do not require additional anti-loosening measures, because high-strength bolts generally require a relatively large Such a large pre-tightening force creates strong pressure between the nut and the connected parts. This pressure will generate friction torque that prevents the nut from rotating, so the nut will not loosen.

08

Stop washer

After tightening the nut, bend the single-ear or double-ear stop washer to the side of the nut and the connector respectively. Tighten the nut to lock it. If two bolts need to be double locked, a double brake washer can be used to brake the two nuts against each other.

09

Spring Washer

Open Spring Washer

Tapered Spring Washer

10

Double-stack self-locking washer

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