Standard Internal Tooth Lock Washers

For screws with a small head, purchasing the Xiaoguo® Standard Internal Tooth Lock Washers is the ideal choice.The internal tooth design ensures that all the teeth can come into contact with the screw head, thereby achieving effective locking.

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Product Description

The Standard Internal Tooth Lock Washers is a type of anti-loosening washer, with inwardly-arranged tooth-like structures on its surface. Its shape is a thin metal ring, with a sharp tooth ring in the middle and a smooth and flat outer circle. When tightening the screw, these teeth will embed into the screw head and the surface of the equipment component, relying on the frictional force and the bite force to prevent the screw from loosening. In simple terms, an "lock" is added between the screw head and the surface of the equipment component, preventing the screw from loosening during the operation of the equipment due to the high vibration frequency.

Working principle

The working principle of the Standard Internal Tooth Lock Washers Joint is actually quite simple. It mainly relies on two functions: "teeth engaging + elastic pressure" to prevent loosening.

（1）Grinding of teeth

The inner ring of the Standard Internal Tooth Lock Washers has a series of sharp teeth. When the bolt or nut is tightened, these teeth will penetrate into the two contacting surfaces:

The bottom surface (metal surface) of the screw head / nut

The surface of the workpiece (sometimes even penetrating the paint or oxide layer)

Once the teeth are inserted, it is as if a ring of "mini-blocking devices" has been placed beneath the screw head. If the screw tries to rotate back on its own, these teeth will firmly grip it and prevent it from moving, thus preventing loosening.

Standard Internal Tooth Lock Washers

M2	2.2	2.34	4.20	4.5	0.28	0.32
M2.5	2.7	2.84	5.20	5.5	0.37	0.43
M3	3.2	3.38	5.70	6.0	0.37	0.43
M3.5	3.7	3.88	6.64	7.0	0.47	0.53
M4	4.3	4.48	7.64	8.0	0.47	0.53
M5	5.3	5.48	9.64	10.0	0.57	0.63
M6	6.4	6.62	10.57	11.0	0.67	0.73
M7	7.4	7.62	12.07	12.5	0.77	0.83
M8	8.4	8.62	14.57	15.0	0.77	0.83
M10	10.5	10.77	17.57	18.0	0.87	0.93
M12	13.0	13.27	19.98	20.5	0.96	1.04
M14	15.0	15.27	23.48	24.0	0.96	1.04
M16	17.0	17.27	25.48	26.0	1.16	1.24
M18	19.0	19.33	29.48	30.0	1.36	1.44
M20	21.0	21.33	32.38	33.0	1.36	1.44
M24	25.0	25.33	37.38	38.0	1.45	1.55
Informtion and drawing Provided are reference only

（2）Elastic pressure

The washer itself is elastic. After being tightened, the Standard Internal Tooth Lock Washers is flattened, but its material always strives to return to its original shape, so it continuously generates a reverse thrust and an upward rebound force.

This elastic force acts on the threads, increasing the friction between the threads. With greater friction, the screws naturally become less likely to loosen.

（3）The combined effect of the two

Mechanical clamping provides direct anti-turning resistance

The elastic preload increases the thread friction and simultaneously compensates for minor vibrations or material creep.

The two work together, ensuring that the Standard Internal Tooth Lock Washers can effectively prevent the bolt from loosening even in environments with vibration, impact, or thermal expansion and contraction.