DIN 5406 Multi-Tab Washer

Structurally, the DIN 5406 multi-tab washer is a closed metal ring with a large number of tabs positioned along the outer contour of the part at an angle of 25° to the part’s working surface. This type of washer is used together with DIN 981 slotted nuts. The tabs improve the grip (locking effect) between the substrate and the nut, thereby preventing it from unscrewing spontaneously.

The application scope of the DIN 5406 multi-tab washer extends to virtually all industries. The part is used wherever the strongest and most reliable connection is required. Together with the nut, the fastener prevents separation and loosening of the fastening assembly’s elements under dynamic loads of any kind during operation.

Standardized requirements for tabbed washers

When manufacturing multi-tab washers, producers follow the regulations of the German standard DIN 5406 or the domestic GOST 11872-89. Products meeting the requirements of these two standards are considered equivalents and have product grade A, but may still have some differences. Therefore, when selecting this type of fastener, the match between the geometric parameters of the washer’s tabs and the dimensions of the nut’s slots should be checked.

Products are manufactured with a threaded hole size ranging from 10 mm to 280 mm, in two types: light L and normal H. The outer diameter size varies within 21-362 mm. Two design variants are offered: with an equal number of tabs positioned symmetrically opposite each other, or evenly distributed along the outer perimeter.

As for manufacturing materials, various types of carbon and stainless steel, non-ferrous metal alloys, and copper are used as raw material. Products made of alloy steel with a protective anti-corrosion coating (zinc plating, chrome plating, nickel plating) or without one are most in demand.

DIN 5406 multi-tab washers made of austenitic chromium-nickel alloys of class A2 and A4 are widely popular. They are not subject to corrosion, do not become magnetized, and last for many years even with constant exposure to acids, alkalis, and seawater. The latter property applies to grade A4, which contains molybdenum. The slotted nut should be made of a similar metal.

DIN 5406 multi-tab washers from FLOK

FLOK supplies certified DIN 5406 multi-tab washers together with nuts, bolts, other threaded fasteners and related products.

Materials:

• Steel
• Coated steel: electrogalvanized

Washer dimensions: inner diameter from 10 to 280 mm, outer diameter from 21 to 362 mm.

DIN 5406 washer number	d	Ds	s	Da	E	F	K
MB 0	10	21	1	13.5	3	8.5	3
MB 1	12	25	1	17	3	10.5	3
MB 2	15	28	1	21	4	13.5	4
MB 3	17	32	1	24	4	15.5	4
MB 4	20	36	1	26	4	18.5	4
MB 5	25	42	1.25	32	5	23	5
MB 6	30	49	1.25	38	5	27.5	5
MB 7	35	57	1.04	44	6	32.5	5
MB 8	40	62	1.25	50	6	37.5	6
MB 9	45	69	1.25	56	6	42.5	6
MB 10	50	74	1.25	61	6	47.5	6
MB 11	55	81	1	67	8	52.5	7
MB 12	60	86	1	73	8	57.5	7
MB 13	65	92	1	79	8	62.5	7
MB 14	70	98	1	85	8	66.5	8
MB 15	75	104	1	90	8	71.5	8
MB 16	80	112	1.8	95	10	76.5	8
MB 17	85	119	1.8	102	10	81.5	8
MB 18	90	126	1.8	108	10	86.5	10
MB 19	95	133	1.8	113	10	91.5	10
MB 20	100	142	1.8	120	12	96.5	10
MB 21	105	145	1.75	126	12	100.5	12
MB 22	110	154	1.75	133	12	105.5	12
MB 23	115	159	2	137	12	110.5	12
MB 24	120	164	2	138	14	115	12
MB 25	125	170	2	148	14	120	12
MB 26	130	175	2	149	14	125	12
MB 27	135	185	2	160	14	130	14
MB 28	140	192	2	160	16	135	14
MB 29	145	202	2	171	16	140	14
MB 30	150	205	2	171	16	145	14
MB 31	155	212	2.5	182	16	147.5	16
MB 32	160	217	2.5	182	18	154	16
MB 33	165	222	2.5	193	18	157.5	16
MB 34	170	232	2.5	193	18	164	16
MB 36	180	242	2.5	203	20	174	18
MB 38	190	252	2.5	214	20	184	18
MB 40	200	262	2.5	226	20	194	18
MB 44	220	292	3	250	24	213	20
MB 48	240	312	3	270	24	233	20
MB 52	260	342	3	300	28	253	24
MB 56	280	362	3	320	28	273	24