Spring washer. Grover spring washer Grover washer GOST 6402 70 designation

GOST 6402-70- spring washer (Grover's washer). It is used in conjunction with bolts, self-tapping screws, studs, and other products to increase the pressure zone on the pressed object and avoid unscrewing the threaded connections.

Washer GOST 6402 70 is made of carbon steel, stainless steel A2 and A4, brass, aluminum.

Has two versions. Spring washers GOST 6402-70 Version 1 have straight edges, and version 2 - curved.

Analogues and compliance with other standards

The exact analogue of the spring washer GOST 6402-70 version 1 - DIN 127 Form B, and version 2 - the same DIN 127 only Form A. They have differences in maximum outer diameter and thickness. Also washers DIN 127 regulate sizes from M2 to M100, and GOST 6402-70 from M2 to M48.

Below are the main dimensions and characteristics of the washers of the GOST 6402-70 grower, version 1.

The main dimensions of the washers GOST 6402-70 Execution 1

For thread size	d1 (max)	d2 (max)	s	h (min.–max.)
M2	2,35	3,49	0,5	1–1,2
M2.5	2,85	4,19	0,6	1,2–1,4
M3	3,4	5,16	0,8	1,6–1,9
M3.5	3,9	6,15	1	1,6–1,9
M4	4,4	6,65	1	1,8–2,1
M5	5,4	8,05	1,2	2,4–2,8
M6	6,68	9,73	1,4	3,2–3,8
M7	7,78	12,03	2	3,2–3,8
M8	8,78	13,03	2	4–4,7
M10	10,9	16,15	2,5	4,4–5,2
M12	12,9	19,15	3	5–5,9
M14	14,9	21,6	3,2	6–7,1
M16	17	24,3	3,5	7–8,3
M18	19,14	27,44	4	7–8,3
M20	21,34	30,64	4,5	8–9,4
M22	23,34	33,64	5	8–9,4
M24	25,34	36,64	5,5	10–11,8
M27	28,34	40,64	6	10–11,8
M30	31,5	44,86	6,5	12–14,2
M33	34,5	48,86	7	13–15
M36	37,5	53,86	8	14–16,2
M39	40,5	57,86	8,5	15–17,2
M42	43,5	61,86	9	16–17,5
M45	46,5	65,86	9,5	17–20,5
M48	49,5	69,93	10	18–20,5

Edition with Amendments No. 2, 3, approved in March 1973, December 1982 (IUS 3-73, 4-83).

By the Decree of the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR dated April 17, 1970 No. 532, the introduction date was set

01.01.72

This International Standard applies to spring washers for bolts, screws and studs with a thread diameter of 2 to 48 mm.

The standard fully complies with ST SEV 2665-80.

1. DESIGN AND DIMENSIONS

1.1. Spring washers must be manufactured in four types:

H - normal with a square cross section;

T - heavy with a square cross section;

OT - extra heavy with a square cross section;

L - lungs with a rectangular cross section.

1.2. The design and main dimensions of the washers must correspond to those indicated in Fig. 1 and in the table.

Nominal thread diameter of a bolt, screw, stud

Washer types

k, (for type L and H washers), not more than

Light washers (L)

Normal washers (N)

Heavy washers (T)

Extra heavy washers (OT)

Previous off

Notes:

1.Size is allowed s within 10% of the nominal size.

2. Washers with dimensions enclosed in brackets are allowed to be used until 01.01.85 and the letter “y” must be indicated in their symbol.

Examples of symbols for a spring washer version 1 for a bolt, screw, stud with a diameter of 8 mm:

normal steel grade 3X13 without coating:

light steel grade 65G with a cadmium coating 9 microns thick chromated:

the same, version 2, with dimensions in brackets:

Sec. 1.

2. TECHNICAL REQUIREMENTS

2.1. Spring washers must be made of wire according to GOST 11850-72 or according to other NTD from steel grades 65G, 70 and 3X13.

It is allowed to manufacture spring washers from bronze of the brand BrKMts3-1 in accordance with GOST 18175-78 or other non-ferrous alloys.

2.2. The mass of steel washers and the calculated elastic force of steel grade 65G are indicated in the appendix.

2.3. Steel spring washers must have a hardness of 41.5 - 49.5 HRC e (HRC 40-48), bronze - not less than 90 HRB. An increase in hardness up to 51.5 HRC e (HRC 50) is allowed for washers made of steel 70.

2.4. The surface of the washers must be free of scale, burrs, cracks and corrosion. Traces of inseparable scale are not a rejection sign.

In the cut plane, defects are allowed that do not affect the performance of the washers and do not take its dimensions beyond the limit deviations.

2.3, 2.4. (Revised edition, Rev. No. 3).

2.5. The ends of the washers must have a flat cut; chipping metal, not displaying the size T from the limit deviations, is not a rejection sign.

The edge formed by the cutting plane and the bearing surface of the washer must be sharp.

2.6. Trapezoidal washer section within the height s is not a defect.

The largest height dimension is taken as the actual thickness. s.

2.7. (Deleted, Rev. No. 3).

2.8. Washers must be made uncoated or coated. Types of coatings, their symbols and thicknesses - according to NTD. It is allowed to use other types of coating - according to GOST 9.306-85.

(Revised edition, Rev. No. 3).

2.8a. Technical requirements to coatings - according to GOST 9.301-86.

(Introduced additionally, Rev. No. 3).

2.9. Washers with a metal coating applied by the cathodic recovery method must be dehydrated.

2.10. The height of the separation of the ends of the washers h1 And h2 after compressing them three times to a flat state and holding in this state for 24 hours, it should be at least 1.65 of the actual thickness of the washer.

2.9, 2.10.(Revised edition, Rev. No. 3).

2.11. The washers must not break or show cracks when the ends are bent through 45°.

2.12. (Deleted, Rev. No. 3).

3. RULES OF ACCEPTANCE AND METHODS OF CONTROL

* On the territory of the Russian Federation, GOST R 50779.71-99 applies.

3.2. From each batch presented for delivery, pucks are selected for verification:

a) appearance;

b) sizes;

c) hardness;

d) viscosity;

e) springy properties;

e) coating quality.

3.1, 3.2.(Revised edition, Rev. No. 3).

3.3. The appearance of the washers is checked by inspection with the naked eye or using a magnifying glass 2.5 - 3 times.

(Revised edition, Rev. No. 2).

3.4. The dimensions of the washers are checked with a universal measuring tool or gauges certified together with measurement methods in the manner prescribed by GOST 8.010-90 **.

** On the territory of the Russian Federation, GOST R 8.563-96 applies.

3.5. Determination of hardness - according to GOST 9013-59. The distance from the center of the imprint to the edge of the washer should be equal to half the size " V". The hardness of washers with nominal diameters from 2 to 5 mm is not controlled. For washers with V< 6 мм допускаются заниженные на 10 % значения твердости, при условии выполнения требований пп. 2.10 и 2.11.

3.6. For viscosity testing, the washer is clamped at one end in a vice, the other end is bent with an adjustable wrench or a lever with a slot in the direction of increasing dimensions. h 1 And h 2 (hell 2, 3, 4). During the test, the dimension must be maintained h between the vise jaws and the wrench, equal to 0.5 ( d + 2c).

3.7. The test of the spring properties of the washers is carried out in the following order:

a) the washers are compressed three times to a flat state;

b) spring washers, at least 10 pieces, separated from each other by flat washers, are put on the bolt shaft of the corresponding diameter and tightened with a nut until the separated ends of the washers are completely compressed.

In this state, the washers are kept for 24 hours.

3.8. Methods for checking the quality of coatings - according to GOST 9.302-88.

3.4-3.8.(Revised edition, Rev. No. 3).

3.9. Each batch of washers must be accompanied by a quality document in the prescribed form indicating:

manufacturer's name or trademark,

symbol of washers,

test results,

batch net, kg.

(Introduced additionally, Rev. No. 3).

4. PACKAGING AND LABELING

4.1. Temporary anti-corrosion protection, packing of spring washers and marking of containers - according to GOST 18160-72.

(Revised edition, Rev. No. 3).

APPLICATION

Reference

WEIGHT OF STEEL WASHER AND THEIR SPRING PROPERTIES

Nominal thread diameter of a bolt, screw, stud	Theoretical weight 1000 pcs. steel washers, kg				Estimated elastic force of washers made of steel 65G, N
	Washer types				Washer types
	Light (L)	Normal (N)	Heavy (T)	Particularly heavy (OT)	Light (L)	Normal (N)	Heavy (T)	Particularly heavy (OT)

Notes:

1. To determine the mass of washers made of bronze, the mass indicated in the table should be multiplied by a factor of 1.08.

2. The mass and elastic force of washers made with sections corresponding to the standard table are given in brackets.

Spring washer GOST 6402-70- the configuration of the hardware is an open ring with distortion - the only coil of the spring, the gap is opposite to the direction of tightening the nut. It is used in detachable threaded connections together with bolts, screws, nuts, studs.

A spring washer (another name for “grover”) is in demand for the most part, in the engineering industry, automotive industry, construction, industry - everywhere in joints that experience strong dynamic loads. Often used for domestic purposes.

For production, various grades of steel are used - carbon, stainless, for example, 65G, 70, 30X13 (spring steels).

Bronze and other non-ferrous metal alloys are used less frequently.
Coating with zinc or cadmium improves the performance of hardware. For non-aggressive environments it is permissible to use uncoated.
The basic requirement for these hardware is that the hardness index must be from 40 HRC and above, bronze products - at least 90 HRB.

WASHER GROVER - principle of operation, production options

Grover's washer is unacceptable, according to GOST 27017, the name of a single-turn spring washer GOST 6402-70, but has long firmly taken its place. English engineer William Grover invented the new kind fasteners on the wave of rapid growth of various inventions of the 19th century. The result of loads and vibrations that were incredible for the mechanics of that time was a problem that was later called "fatigue failure". Connections secured with conventional threaded fasteners were loosened.
Grover's invention withstands shock loads while acting as a stopper. The principle of operation lies in the operation of an elementary law of physics - in the direct course (screwing), the movement of the threaded fastener is unhindered, in the opposite course (unscrewing) - the sharp edge "rests", blocking the movement due to the friction force.
This hardware is chosen with a diameter slightly larger than the diameter of the bolt or screw. Grover is located between the nut and the mounting surface or flat washer, or under the head of a bolt or screw. Thus, threaded connections become durable and safe for a long time.
Standard 6402-70 defines four types:
H - normal - square cross-section;
T - heavy - also with a square section;
OT - extra heavy - with a square cross section;
L - light - in this type, the cross section is a rectangle.

Reading the notation:
Washer 2 12L 65G 016 GOST 6402-70
Execution 2 is indicated in the formula (version 1 is not indicated in any way),
12 - for a bolt, screw or stud of the specified diameter,
L - light, steel 65G,
galvanized (01), coating thickness 6 µm.

Production of grover washers GOST 6402-70 in our company is certified according to the requirements of ISO 9001 - the quality of all types of manufactured hardware is guaranteed. As a standard, we check all the parameters of each batch: appearance, dimensions, hardness, viscosity, spring properties, coating quality. The price for GOST 6402-70 washers is determined by the material used, the type of coating and the volume of the order.

Description of the offer and product characteristics

GOST 6402-70 applies to spring washers for bolts, screws and studs with a thread diameter of 2 to 48 mm.

Spring washers must be manufactured in four types:

H - normal with a square cross section;
T - heavy with a square cross section;
OT - extra heavy with a square cross section;
L - lungs with a rectangular cross section.

The design and main dimensions of the washers must correspond to those indicated in Fig. 1 and in the table.

Washer types

k, (for type L and H washers), not more than

Light washers (L)

Normal washers (N)

Heavy washers (T)

Extra heavy washers (OT)

Previous off

Notes:

1.Size is allowed s within 10% of the nominal size.

2. Washers with dimensions enclosed in brackets are allowed to be used until 01.01.85 and the letter “y” must be indicated in their symbol.

Spring Washer Code Examples version 1 for a bolt, screw, stud with a diameter of 8 mm:

normal steel grade 3X13 without coating:

Washer 8 3X13 GOST 6402-70

light steel grade 65G with a cadmium coating 9 microns thick chromated:

Washer 8L 65G 029 GOST 6402-70

the same, version 2, with dimensions in brackets:

Washer 2U 8L 65G 029 GOST 6402-70

The mass of steel washers and the calculated elastic force of steel grade 65G are indicated in the appendix.

Steel spring washers must have a hardness of 41.5-49.5 HRC e (HRC40-48), bronze washers of at least 90 HRB. An increase in hardness up to 51.5 HRC e (HRC 50) is allowed for washers made of steel 70.

The surface of the washers must be free of scale, burrs, cracks and corrosion. Traces of inseparable scale are not a rejection sign.

In the cut plane, defects are allowed that do not affect the performance of the washers and do not take its dimensions beyond the limit deviations.

The ends of the washers must have a flat cut; chipping metal, not displaying the size T from the limit deviations, is not a rejection sign.

The edge formed by the cutting plane and the bearing surface of the washer must be sharp.

Trapezoidal washer section within the height s is not a defect.

The largest height dimension is taken as the actual thickness. s.

Washers must be made uncoated or coated. Types of coatings, their symbols and thicknesses - according to normative and technical documentation. It is allowed to use other types of coating - according to GOST 9.306-85.

APPLICATION
Reference

WEIGHT OF STEEL WASHER GOST 6402-70 AND THEIR SPRING PROPERTIES

Theoretical weight 1000 pcs. steel washers, kg				Estimated elastic force of washers made of steel 65G, N
Washer types				Washer types
Light (L)	Normal (N)	Heavy (T)	Particularly heavy (OT)	Light (L)	Normal (N)	Heavy (T)	Particularly heavy (OT)

Notes:

1. To determine the mass of washers made of bronze, the mass indicated in the table should be multiplied by a factor of 1.08.

2. In parentheses are the mass and elastic force of washers made with sections corresponding to Table. 1.