DIN 432 Lock Washer with External Tab

Lock washer DIN 432 with external tab is a piece of hardware that performs a locking function in threaded connections. The standard was developed in Germany and corresponds to applicable Russian national standards.

Washer DIN 432

Assemblies in machine tools, automotive, rail and marine transport, and special process systems operate under constant vibration loads. Frequent shaking can loosen a threaded connection regardless of the quality of the initial tightening of bolts, screws and studs with nuts. Loosened fasteners lead to emergency situations with unpredictable consequences for equipment and people. An example is the accident at the Sayano-Shushenskaya hydroelectric power plant: vibration loosened the bolts securing the turbine cover, the cover was torn off, the plant still does not operate at full capacity, about a hundred people died, and the economic damage is enormous. Reliable fastener locking with special washers featuring a locking tab reduces the risk of such failures.

The washer is installed under the nut or under the bolt head. DIN 432 is made from high-strength steels, which, after the hardware item is manufactured, are additionally coated with zinc by electroplating. Steels of grades A4 and A2 are also used.

DIN 432

Description: DIN 432 Lock Washer with External Tab.

Materials:

• Steel
• Coated steel: electrogalvanized
• Stainless steel: A2, A4
• Non-ferrous metals, alloys, plastic: brass.

Dimensions of lock washer DIN 432 in mm:

d	d₁	d₂	h	s
M4	4.3	14	2	0.4
M5	5.3	17	2.5	0.75
M6	6.4	19.0	3	0.75
M8	8.4	22	4	1
M10	10.5	26	4	1
M12	13.0	30	4.5	1.2
M14	15.0	33	4.5	1.2
M16	17.0	36	4.5	1.2
M18	19.0	40	4.5	1.2
M20	21.0	42	4.5	1.6
M22	23.0	50	6.5	1.6
M24	25.0	50	6.5	1.6
M27	28.0	58	9.5	1.6
M30	31.0	63	9.5	1.6
M33	34.0	68	9.5	1.6
M36	37.0	75	9.5	2
M39	40.0	82	11	2

d	d₁	d₂	f	g	h	s
M4	4.3	14	2.5	5.5	2	0.4
M5	5.3	17	3.5	7	2.5	0.75
M6	6.4	19	3.5	7.5	3	0.75
M8	8.4	22	3.5	8.5	4	1
M10	10.5	26	4.5	10	4	1
M12	13	30	4.5	12	4.5	1.2
M14	15	33	4.5	13	4.5	1.2
M16	17	36	5.5	15	4.5	1.2
M18	19	40	6.5	18	4.5	1.2
M20	21	42	6.5	18	4.5	1.6
M22	23	50	7.5	20	6.5	1.6
M24	25	50	7.5	21	6.5	1.6
M27	28	58	8.5	23	9.5	1.6
M30	31	63	8.5	25	9.5	1.6
M33	34	68	9.5	28	9.5	1.6
M36	37	75	11	31	9.5	2
M39	40	82	11	33	11	2
M42	43	88	11	36	11	2
M45	46	95	13	38	12	2
M48	50	100	13	40	13	2
M52	54	105	13	42	13	2
M56	58	112	16	45	14	2.5
M60	62	118	16	48	13.5	2.5
M64	66	125	18	52	13.5	2.5