GOST 11371-78 Washers. Specifications

GOST 11371-78 applies to normal-series washers of product grades A and C for fasteners with thread diameter from 1 to 48 mm. The standard conforms to ST SEV 280-76, ST SEV 281-87.

1. Basic parameters and dimensions

Washers are manufactured in design 1 and design 2 (for d ≥5 mm).

Washers. Specifications Vashers. Specifications	GOST 11371-78* (ST SEV 280-89, ST SEV 281-87) Supersedes GOST 11371-68

Thread diameter of fastener	d₁		d₂	s
	Product grade
	1	2
1.0	1.2	1.1	3.5	0.3
1.2	1.4	1.3	4.0
1.4	1.6	1.5
1.6	1.8	1.7
2.0	2.4	2.2	5.0
2.5	2.9	2.7	6.5	0.5
3.0	3.4	3.2	7.0
3.5	-	3.7	8.0
4.0	4.5	4.3	9.0	0.8
5.0	5.5	5.3	10.0	1.0
6.0	6.6	6.4	12.0	1.6
8.0	9.0	8.4	16.0
10.0	11.0	10.5	20.0	2.0
12.0	13.5	13.0	24.0	2.5
14.0	15.5	15.0	28.0
16.0	17.5	17.0	30.0	3.0
18.0	20.0	19.0	34.0
20.0	22.0	21.0	37.0
22.0	24.0	23.0	39.0
24.0	26.0	25.0	44.0	4.0
27.0	30.0	28.0	50.0
30.0	33.0	31.0	56.0
33.0	-	34.0	60.0	5.0
36.0	39.0	37.0	66.0
39.0	-	40.0	72.0	6.0
42.0	45.0	43.0	78.0	7.0
48.0	52.0	50.0	92.0	8.0

Example of a designation for a design 1, product grade A washer for a fastener with a diameter of 12 mm, with thickness as specified in the standard, made of steel grade 08kp, with a 6 µm zinc coating, chromated:

Washer 12.01.08kp.016 GOST 11371-78

Same, for design 2:

Washer 2.12.01.08kp.016 GOST 11371-78

The theoretical mass of washers is given in the appendix.

By agreement between the manufacturer and the customer, washers may be manufactured with other thicknesses.

2. Technical requirements

Technical requirements — in accordance with GOST 18123-82.

The hardness of steel washers of product grade A is not less than 140 HV; of product grade C, not less than 100 HV.

Temporary corrosion protection, packaging and container marking — in accordance with GOST 18160-72.

3. Acceptance rules

Acceptance rules for washers are per GOST 17769-83.

4. Test methods

Test methods for washers — in accordance with GOST 18123-82.

Appendix (reference)

Mass of steel washers:

Thread diameter of fastener, mm	Theoretical mass per 1000 pcs, kg, for designs
	1		2
	Product grade
	C	A
1.0	0.020	0.020	-
1.2	0.026	0.026	-
1.4	0.025	0.025	-
1.6	0.024	0.024	-
2.0	0.036	0.037	-
2.5	0.085	0.088	-
3.0	0.115	0.119	-
3.5	-	0.155	-
4.0	0.299	0.308	-
5.0	0.430	0.443	0.413
6.0	0.990	1.016	0.925
8.0	1.725	1.828	1.706
10.0	3.438	3.571	3.333
12.0	6.066	6.270	5.824
14.0	8.377	8.612	8.089
16.0	10.976	11.295	10.491
18.0	13.976	14.697	13.782
20.0	16.361	17.156	16.157
22.0	17.470	18.339	17.285
24.0	31.058	32.315	30.211
27.0	39.438	42.298	39.898
30.0	50.456	53.612	50.917
33.0	-	75.303	70.809
36.0	87.350	92.033	87.078
39.0	-	132.513	124.748
42.0	175.088	182.680	171.256
48.0	283.956	294.013	270.397

Note. To determine the mass of washers made from other materials, the mass values given in the table are multiplied by a coefficient:

0.35 — for aluminium alloy;

0.97 — for bronze;

1.08 — for brass;

1.13 — for copper.

Complies with DIN 125.