弧形弹簧锁垫圈

DEUTSCHE NORM 000000 October 1994

Curved spring lock washers

DIN 128

ICS 21.060.30

Supersedes October 1987 edition.

Descriptors: Fastener, spring lock washer, washer, bolt/nut assembly.

Federringe, gewölbt

In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker.

Dimensions in mm

1 Scope and field of application

Spring lock washers as covered in this standard are deemed to be spring washers designed for use with bolt/nut assemblies involving fasteners of a property class less than 8.8, as specified in DIN EN 20898-1. They are intended to counteract the effect of setting which results in bolt/nut assemblies working loose (see DIN 267-26). They do not effectively prevent loosening of the assembly under varying radial load and are designed for use with short bolts predominantly subject to thrust.

Continued on pages 2 and 3.

Beuth Verlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). 06.95

DIN 128 Engl. Price group 5 Sales No. 0105

2 Dimensions

Type A, curved*)

Washer cross section (enlarged)

c < s_min

Position of curve peak

The spring lock washers may be used both for bolts with right-hand and with left-hand thread.

Table 1: Dimensions of type A spring lock washers

Nominal size	d1		d2 max.	b		s		h		r ≈	Apr. mass (7,85 kg/dm³) per 1000 units, in kg	For thread size M
	min.	max.		Nominal size	Limit deviations	Nominal size	Limit deviations	min.	max.
2¹)	2,1	2,4	4,4	0,9	± 0,1	0,5	± 0,1	0,7	0,9	0,1	0,035	2
2,5¹)	2,6	2,9	5,1	1	± 0,1	0,6	± 0,1	0,9	1,1	0,1	0,055	2,5
3¹)	3,1	3,4	6,2	1,3	± 0,1	0,7	± 0,1	1,1	1,3	0,1	0,09	3
3,5¹)	3,6	3,9	6,7	1,3	± 0,1	0,7	± 0,1	1,1	1,3	0,1	0,1	3,5
4	4,1	4,4	7,6	1,5	± 0,1	0,8	± 0,1	1,2	1,4	0,2	0,15	4
5	5,1	5,4	9,2	1,8	± 0,1	1	± 0,1	1,5	1,7	0,2	0,3	5
6	6,1	6,5	11,8	2,5	± 0,15	1,3	± 0,1	2	2,2	0,3	0,7	6
7¹)	7,1	7,5	12,8	2,5	± 0,15	1,3	± 0,1	2	2,2	0,3	0,75	7
8	8,1	8,5	14,8	3	± 0,15	1,6	± 0,1	2,45	2,75	0,5	1,3	8
10	10,2	10,7	18,1	3,5	± 0,2	1,8	± 0,1	2,85	3,15	0,5	2,1	10
12	12,2	12,7	21,1	4	± 0,2	2,1	± 0,15	3,35	3,65	1	3,2	12
14	14,2	14,7	24,1	4,5	± 0,2	2,4	± 0,15	3,9	4,3	1	4,8	14
16	16,2	17	27,4	5	± 0,2	2,8	± 0,15	4,5	5,1	1	7	16
18	18,2	19	29,4	5	± 0,2	2,8	± 0,15	4,5	5,1	1	7,8	18
20	20,2	21,2	33,6	6	± 0,2	3,2	± 0,2	5,1	5,9	1	12,2	20
22	22,5	23,5	35,9	6	± 0,2	3,2	± 0,2	5,1	5,9	1	13,3	22
24	24,5	25,5	40	7	± 0,25	4	± 0,2	6,5	7,5	1,6	21,5	24
27	27,5	28,5	43	7	± 0,25	4	± 0,2	6,5	7,5	1,6	23,7	27
30	30,5	31,7	48,2	8	± 0,25	6	± 0,2	9,5	10,5	1,6	42,5	30
36	36,5	37,7	58,2	10	± 0,25	6	± 0,2	10,3	11,3	1,6	68	36

¹) Values to be complied with in the spring force test as described in DIN 267-26 have not as yet been specified for this size.

*) Type B is no longer specified.

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3 Technical delivery conditions

Spring washers shall be made of spring steel (FSt) as specified in DIN 267-26, which shall also apply with regard to the technical delivery conditions.

4 Designation

Designation of a type A washer of nominal size 8, made of spring steel (FSt)¹⁾:

Spring washer DIN 128 – A8 – FSt

The DIN 4000-3-3 tabular layout of article characteristics shall apply to spring washers as covered in this standard.

Standards referred to

DIN 267-26	Fasteners; technical delivery conditions; steel spring washers for bolt/nut assemblies
DIN 4000-3	Tabular layout of article characteristics for washers
DIN EN 20 898-1	Mechanical properties of fasteners; bolts, screws and studs (ISO 898-1 : 1988)

Amendments

The following amendments have been made to the October 1987 edition.

• a) Type B is no longer specified.
• b) Nominal sizes exceeding 36 are no longer specified.
• c) The standard has been editorially revised.

Previous editions

DIN 128: 1968-04, 1987-10.

Explanatory notes

By maintaining a sufficiently high preloading in a bolt/nut assembly, spring washers are designed to prevent loosening of the assembly, which may be caused, for instance, by the effect of setting. The specification of residual spring forces given in DIN 267-26 has made it possible for the first time to assess the performance of such washers.

The specification that spring lock washers complying with the present standard can only be used effectively for bolt/nut assemblies involving fasteners of a property class less than 8.8 reflects the current state of the art. This does not, however, rule out the manufacture of spring lock washers suitable for bolt/nut assemblies involving fasteners of property class 8.8. This has been substantiated by tests, but it is recommended that the washer manufacturer be consulted before spring lock washers are used for such type of assembly and verification required of their effectiveness on the basis of tests similar to those described in DIN 267-26.

Type B spring washers are no longer specified since they are less suitable for the proposed application than those of type A and do not meet the requirements specified in DIN 267-26. However, since the fitting dimensions of type B are equivalent to those of type A, interchangeability is not adversely affected.

Although type B washers have been dropped, the designation 'type A' has been retained so as to indicate that the design of this type has not been changed.

International Patent Classification

F 16 B 039/24

1) FSt shall also apply where no material has been specified in existing documentation.

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3 Technische Lieferbedingungen

Tabelle 2: Technische Lieferbedingungen

	Stahl
Werkstoff1)	St = QSt 32-3 oder QSt 36-3 nach Wahl des Herstellers
Zugfestigkeit Rm min N/mm2	290
Norm	DIN 1654 Teil 2
Maß-, Form- und Lagetoleranzen	DIN 101
Oberfläche	Regelausführung: blank Wird ein bestimmter Oberflächenschutz gewünscht, z. B. galvanischer Oberflächenschutz nach DIN ISO 4042, so ist dies bei Bestellung zu vereinbaren. Die in der Tabelle 1 angegebenen Toleranzen und Grenzabmaße gelten auch nach Aufbringen einer Beschichtung.
Prüfung der mechanischen Eigenschaften	DIN 101
Annahmeprüfung	DIN 101
1) Andere Werkstoffe nach Vereinbarung

4 Bezeichnung

Bezeichnung eines Halbrundniet mit Nenndurchmesser d₁ = 20 mm und Länge l = 40 mm, aus Stahl (St):

Niet DIN 124 — 20 × 40 — St

Für Niete nach dieser Norm gilt Sachmerkmal-Leiste DIN 4000-9-3.

5 Anwendung

In Tabelle 3 sind neben den Schließkopffmaßen auch die größten Klemmlängen für Halbrundkopf (A) und Senkkopf (B) als Anhaltswerte angegeben.

Form A Halbrundkopf als Schließkopf

Form B Senkkopf als Schließkopf

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Tab. 3: Lochdurchmesser und Anhaltswerte für Schließkopfmäße und Klemmlängen

	d1	10	12	(14)	16	(18)	20	(22)	24	(27)	30	(33)	36
Halbrundkopf A	d7 H12	10,5	13	15	17	19	21	23	25	28	31	34	37
	d8	16	9	22	25	28	32	36	40	43	48	53	58
	k1	6,5	7,5	9	10	11,5	13	14	16	17	19	21	23
	r1 ≈	8	9,5	11	13	14,5	16,5	18,5	20,5	22	24,5	27	30
Senkkopf B	d8	16	9	22	26	29	31	34,5	37	41,5	44	48	52
	r2 ≈	32	5	60	85	105	120	75	85	110	120	145	170
	w ≈	1	1	1	1	1	1	2	2	2	2	2	2
	t1	4,2	5,1	5,7	7	7,7	10	11,3	11,7	13,1	17,5	18,5	20
	α	75°					60°					45°
l	Klemmlänge smax
	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B
16	5	9
18	7	11	5	10
20	8	13	7	12	4	12
22	10	14	8	13	6	13
24	12	16	10	15	8	15	6	14
26	13	17	11	16	9	16	7	15	5	15
28	15	19	13	18	11	18	9	17	7	17
30	17	21	15	20	12	20	11	19	9	18	6	18
32	18	23	16	21	14	21	13	20	11	20	8	20
34	20	25	18	23	16	23	15	22	13	22	10	22	9	20
36	21	26	19	24	17	24	16	23	14	23	11	23	10	21
38	23	28	21	26	19	26	17	25	16	25	13	25	12	23	7,3	23,3
40	25	29	22	27	21	27	19	27	17	27	15	27	13	25	9	25
42	27	31	24	29	22	29	21	29	19	29	16	28	15	27	12	27	12	26
45	29	34	26	31	25	31	23	31	21	31	19	30	18	29	14	29	14	29
48	32	36	29	34	27	34	26	34	24	34	21	33	20	32	17	32	17	31
50	33	38	30	36	29	36	27	35	26	35	22	35	22	34	18	34	18	33	15	32
52			32	37	30	37	29	37	27	37	25	37	24	35	20	35	20	35	17	34
55			34	38	33	39	31	39	30	39	27	39	26	38	23	38	23	37	20	37	17	36
58			37	40	35	42	34	42	32	42	30	41	29	40	25	40	25	40	22	39	19	39
60			38	42	37	43	36	43	34	43	32	43	31	42	27	42	27	42	24	41	21	41
62					38	45	37	45	36	45	33	45	32	44	29	43	29	43	26	43	23	42	19	42
65					41	48	40	48	38	48	36	48	35	46	31	47	31	46	28	45	25	45	21	44
68					43	50	42	50	41	50	38	50	37	49	34	48	34	49	31	48	28	48	24	47

(fortgesetzt)

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Tabelle 3 (abgeschlossen)

	d1	10	12	(14)	16	(18)	20	(22)	24	(27)	30	(33)	36
Halbrundkopf A	d7 H12	10,5	13	15	17	19	21	23	25	28	31	34	37
	d8	16	9	22	25	28	32	36	40	43	48	53	58
	k1	6,5	7,5	9	10	11,5	13	14	16	17	19	21	23
	r1 ≈	8	9,5	11	13	14,5	16,5	18,5	20,5	22	24,5	27	30
Senkkopf B	d8	16	9	22	26	29	31	34,5	37	41,5	44	48	52
	r2 ≈	32	5	60	85	105	120	75	85	110	120	145	170
	w ≈	1	1	1	1	1	1	2	2	2	2	2	2
	t1	4,2	5,1	5,7	7	7,7	10	11,3	11,7	13,1	17,5	18,5	20
	α	75°					60°				45°
l	Klemmlänge smax
	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B
70					45	52	44	52	42	52	40	52	39	51	35	51	35	50	33	50	29	49	25	49
72							45	53	44	53	42	53	41	52	38	52	38	52	34	51	31	51	27	50
75							48	56	46	56	44	56	43	55	40	55	39	55	37	54	34	54	30	53
78							50	59	49	59	47	59	46	58	43	57	43	57	40	56	36	56	32	56
80							52	60	51	60	48	60	48	59	44	59	44	59	41	58	38	58	34	57
85									55	64	53	64	52	64	48	64	48	63	46	62	42	62	38	62
90									59	68	57	68	56	68	52	68	52	68	50	67	47	66	43	66
95											61	72	60	72	57	72	56	72	54	71	51	71	47	70
100											65	76	65	76	61	76	60	76	58	75	55	75	51	75
105													69	81	65	81	65	80	63	80	60	79	56	79
110													73	85	69	85	69	85	67	84	64	84	60	83
115															74	89	73	89	71	88	68	88	64	87
120															78	94	77	93	76	93	72	92	68	92
125																	81	98	80	97	77	97	73	96
130																	86	102	84	101	81	101	77	100
135																	90	106	89	105	85	105	81	105
140																			93	110	90	109	86	109
145																			97	114	94	114	90	113
150																			101	118	98	118	94	118
155																					103	122	99	122
160																							107	127	103	126

Die angegebenen Klemmlängen gelten nur als Anhaltswerte. Vor allem bei Massenfertigungen sollten Probenietungen durchgeführt werden.

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