DIN 9250 wedge lock washer

Short Description:

DIN 9250 is a locking washer. Its main function is to prevent threaded connections from loosening under conditions such as vibration, impact or dynamic load. In mechanical structures, if many joints become loose, it may lead to serious consequences such as equipment failure and safety accidents.

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DIN 9250 Dimensions Reference

M	d	dc	h	H
M1.6	1.7	3.2	0.35	0.6
M2	2.2	4	0.35	0.6
M2.5	2.7	4.8	0.45	0.9
M3	3.2	5.5	0.45	0.9
M3.5	3.7	6	0.45	0.9
M4	4.3	7	0.5	1
M5	5.3	9	0.6	1.1
M6	6.4	10	0.7	1.2
M6.35	6.7	9.5	0.7	1.2
M7	7.4	12	0.7	1.3
M8	8.4	13	0.8	1.4
M10	10.5	16	1	1.6
M11.1	11.6	15.5	1	1.6
M12	13	18	1.1	1.7
M12.7	13.7	19	1.1	1.8
M14	15	22	1.2	2
M16	17	24	1.3	2.1
M18	19	27	1.5	2.3
M19	20	30	1.5	2.4
M20	21	30	1.5	2.4
M22	23	33	1.5	2.5
M24	25.6	36	1.8	2.7
M25.4	27	38	2	2.8
M27	28.6	39	2	2.9
M30	31.6	45	2	3.2
M33	34.8	50	2.5	4
M36	38	54	2.5	4.2
M42	44	63	3	4.8

DIN 9250 Features

Shape design:
Usually a toothed elastic washer or a split-petal design, which uses the toothed edge or split-petal pressure to increase friction and effectively prevent the bolt or nut from loosening.
The shape may be conical, corrugated or split-petal, and the specific design depends on the actual application.

Anti-loosening principle:
After the washer is tightened, the teeth or petals will embed into the connection surface, forming additional friction resistance.
Under the action of vibration or impact load, the washer prevents the threaded connection from loosening by evenly dispersing the load and absorbing vibration.

Material and treatment:
Material: Usually made of high-strength carbon steel or stainless steel to ensure strength and durability.
Surface treatment: Use processes such as galvanizing, phosphating or oxidation to improve corrosion resistance and suitable for harsh environments.