Spring washer.


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

A spring washer (another name for “grower”) is in demand mostly in the engineering industry, automotive industry, construction, industry - everywhere in connections experiencing strong dynamic loads. Often used for household purposes.

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


Bronze and other alloys of non-ferrous metals are used less frequently.
Coating with zinc or cadmium improves the performance characteristics of hardware. For non-aggressive environments it is permissible to use without coating.
The basic requirement for these hardware is that the hardness index must be from 40 HRC and above, bronze products must be at least 90 HRB.

GROVER WASHER - principle of operation, production options

Grover washer is an unacceptable name, according to GOST 27017, for a single-turn spring washer GOST 6402-70, but has long firmly taken its place. English engineer William Grover invented new look fasteners in the wake of the rapid growth of various inventions of the 19th century. The result of loads and vibrations incredible for the mechanics of that time was a problem that was later called “fatigue failure.” Connections secured with conventional threaded fasteners became loose.
Grover's invention withstands shock loads while simultaneously acting as a stopper. The principle of operation is based on the operation of an elementary law of physics - with a forward stroke (screwing), the movement of the threaded fastener is unimpeded, with the opposite stroke (unscrewing) - the sharp edge “rests”, stopping the movement due to the friction force.
This hardware is selected with a diameter slightly larger than the diameter of the bolt or screw. The groover is located between the nut and the fastening 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:
N - normal - square cross section;
T - heavy - also with a square section;
OT - extra heavy - with a square cross section;
L - light - this type has a rectangular cross section.

We read the designation:
Washer 2 12L 65G 016 GOST 6402-70
The formula indicates execution 2 (execution 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 microns.

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

/ GOST 6402-70 spring washer, Grover washer

A spring washer GOST 6402-70 or a Grover washer is a split round washer, the ends of which are located in different planes, which serves to prevent self-unscrewing of fasteners through its elastic deformation under load. It is made of spring steel 65G with subsequent heat treatment.


Increasing the contact area bolted connection parts, as well as reducing the pressure on the surface is achieved using Grover washers of the required diameter.

Spring washers are used in mechanical engineering and instrument making as locking connection elements.

Grover washer should be manufactured without coating or with coatings. Types of coatings, their symbols and thicknesses - according to regulatory and technical documentation.

By installing a Grover washer, the stability of the mechanical connection is achieved.

Washer size range: M6, M8, M10, M12, M16, M20, M24, M27, M30, M36, M42, M48, M52.

Spring washer (grower washer GOST 6402) comes in four types:

  • N - normal with a square cross section;
  • T - heavy with a square cross section;
  • OT - extra heavy with a square cross section;
  • L - lightweight with a rectangular cross-section.

At the consumer's request, the Grover washer is coated using chemical galvanizing or thermal diffusion.

Spring washer GOST 6402-70 (grover)
Nominal thread diameter of bolt, screw, stud d Types of washers
Lungs(L)Normal(N)Heavy(T)Extra heavy (OT)
bs b=sb=sb=s
2 2,1 0,8 0,5 0,5 0,6
2,5 2,6 0,8 0,6 0,6 0,8
3,0 3,1 1,0 0,8 0,8 1,0
3,5 3,6 1,0 0,8 1,0 1,0
4,0 4,1 1,2 0,8 1,0 1,4
5,0 5,1 1,2 1,0 1,2 1,6
6,0 6,1 1,6 1,2 1,4 2,0
8,0 8,2 2,0 1,6 2,0 2,5
10,0 10,2 2,5 2,0 2,5 3,0 3,5
12,0 12,2 3,5 2,5 3,0 3,5 4,0
14,0 14,2 4,0 3,0 3,2 4,0 4,5
16,0 16,3 4,5 3,2 3,5 4,5 5,0
18,0 18,3 5,0 3,5 4,0 5,0 5,5
20,0 20,5 5,5 4,0 4,5 5,5 6,0
22,0 22,5 6,0 4,5 5,0 6,0 7,0
24,0 24,5 6,5 4,8 5,5 7,0 8,0
27,0 27,5 7,0 5,5 6,0 8,0 9,0
30,0 30,5 8,0 6,0 6,5 9,0 10,0

Examples of symbols:

Grover washer GOST 6402 version 1 for a bolt, screw, stud with a diameter of 8 mm, normal, made of steel grade 3X13 without coating:

Washer 8 3Х13 GOST 6402-70

Grover light washer with a diameter of 10 mm made of steel grade 65G with a cadmium coating 9 microns thick, chromated:

Washer 10L 65G 029 GOST 6402-70

Light spring washer, version 2, diameter 16 mm with dimensions enclosed in brackets:

Washer 16L 65G 029 GOST 6402-70

Normal spring washer, version 2, diameter 20 mm with dimensions enclosed in brackets:

Washer 20 65G 029 GOST 6402-70

TECHNICAL REQUIREMENTS.

Spring washers must be made of wire in accordance with GOST 11850-72 or according to other regulatory and technical documentation from steel grades 65G, 70 and 3X13. Production allowed spring washers made of bronze grade BrKMts3-1 according to GOST 18175-78 or other non-ferrous alloys.

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

Steel spring washers must have a hardness of 41.5-49.5, bronze washers must have a hardness of at least 90 >HRB. It is allowed to increase the hardness up to 51.5 HRC 50) for washers made of steel 70. The edge formed by the cutting plane and the supporting surface of the washer must be sharp.

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

Defects are allowed in the cut plane that do not affect the performance characteristics of the washers and do not take its dimensions beyond the maximum deviations.

The ends of the washers must have a flat cut; chipping of metal that does not show size T from the maximum deviations, is not a rejection sign.

Trapezoidal cross-section of the washer within the height limits s is not a defect. The actual thickness is taken largest size heights s

Washers must be manufactured uncoated or coated. Types of coatings, their symbols and thicknesses - according to regulatory and technical documentation. It is allowed to use other types of coating - in accordance with GOST 9.306-85. Technical requirements for coatings - according to GOST 9.301-86.

Washers coated with cathodic reduction metal must be dehydrated.

Height of the ends of the washers h 1 And h 2 after compressing them three times to a flat state and holding them in this state for 24 hours, it should be at least 1.65 of the actual thickness of the washer. The washers should not break or crack when the ends are bent at 45°.

ACCEPTANCE RULES AND CONTROL METHODS.

Acceptance rules - according to GOST 17769-83 for rough precision products (accuracy class C).

Quality control of coatings is carried out according to a one-stage plan with a control level of 5-2 and an acceptance level of defects of 4% according to GOST 18242-72.

From each batch presented for delivery, washers are selected for inspection: appearance, sizes, hardness, viscosity, spring properties, coating quality.

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

The dimensions of the washers are checked with universal measuring tools or gauges certified together with measurement methods in the manner established by GOST 8.010-90.

Determination of hardness - according to GOST 9013-59. The distance from the center of the print 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.

To test toughness, 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 h2 (damn1,2,3). During testing, the size must be maintained h between the jaws of the vice and the key, equal to 0.5 d.

Testing the spring properties of washers is carried out in the following order:

a) the washer is compressed three times to a flat state;

b) spring washer, 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.

The washers are kept in this state for 24 hours. Methods for checking the quality of coatings are in accordance with GOST 9.302-88.

Each batch must be accompanied by a quality document in the established form indicating: the name or trademark of the manufacturer, symbol washers, test results, batch net, kg.

Various types of washers, large assortment, high quality And affordable prices on fasteners, Grover washers - always favorable conditions for cooperation.

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    • Payment methods

    For both physical and legal entities There are 2 payment methods:
    • cash upon pickup from our warehouse. Cash invoices are issued without VAT. For organizations that require a VAT invoice, only non-cash payments are possible.
    • cashless payment. For cashless payment, contact us and we will issue you an invoice.
    Attention! Before coming to purchase the product, please contact us to check availability.

    Cost and delivery time

    For Moscow and Moscow region:
    • from 30 t.r. free delivery within the 3rd transport ring;
    • for orders up to 30 tr. and within the Moscow Ring Road, the cost can be clarified in the delivery section.
    • At the request of the client, we can deliver the order to any transport company for free. The cost and delivery time to the destination depend on the transport company. Delivery by the transport company is paid by the client. Delivery times to a transport company or within the Moscow region are usually 1-3 days.
    For other cities of the Russian Federation:

    Within the territory of the Russian Federation, delivery is carried out by a transport company chosen by the client. We deliver the order to the transport company free of charge within 1-3 days. The cost and delivery time are paid by the client and depend on the chosen transport company.

    Pickup:
    Pickup is possible if the goods are in stock from any of our branches free of charge.

    Attention! Before coming to order, be sure to check availability.

    In the absence required product in the warehouse, delivery between branches is possible free of charge. Check with the managers for deadlines.

    Documents for ordering

    After payment for the order, we provide customers with a complete package of documents:

    For individuals:

    • cash receipt;
    • packing list;
    For legal entities:
    • original invoice;
    • original contract (upon request);
    • packing list;
    • invoice (for VAT refund);
    • warranty card from the manufacturer;
    • certificate of product conformity (on request).

    Guarantee

    All products presented are covered by a warranty based on the manufacturer's terms and conditions.

    Warranty obligations are fulfilled by our own service centers or third-party authorized service centers.

    Return of goods:

    The buyer has the right to refuse the ordered goods at any time before receiving it.

    After receiving the order, the buyer, according to the law “On Protection of Consumer Rights”, has the right to return the goods of proper quality within 14 days if the product:

    • never used, stored presentation, seals, factory labels, etc.;
    • there is a document confirming the purchase of this product;
    • the product does not belong to the list of goods that cannot be exchanged or returned;
    • otherwise not specified in the contract.
    Return of goods poor quality carried out also in our service centers. It is mandatory that diagnostics be carried out first, and if the manufacturer refuses warranty obligations, diagnostics and, at the client’s request, repairs are paid for. Otherwise, all work is performed free of charge.

    Attention! All transportation costs for delivering products to service center buyer assumes.

    SPRING WASHERS

    TECHNICAL CONDITIONS

    GOST 6402-70

    (ST SEV 2665-80)

    Moscow

    STATE STANDARD OF THE USSR UNION

    Resolution of the Committee on Standards, Measures and measuring instruments under the Council of Ministers of the USSR dated April 17, 1970 No. 532, the introduction date is set

    Tested in 1982

    from 01/01/72

    This standard applies to spring washers for bolts, screws and studs with thread diameters from 2 to 48 mm.

    The standard fully complies with ST SEV 2665-80.

    1. DESIGN AND DIMENSIONS

    1.1. Spring washers should be made of four types:

    N - 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 the drawing. and in .

    3.4-3.8.(Changed edition, Amendment No. 3).

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

    manufacturer's name or trademark,

    symbol of washers,

    test results,

    net batch, kg.

    (Introduced additionally, Amendment No. 3).

    4. PACKAGING AND LABELING

    4.1. Temporary anti-corrosion protection, packaging of spring washers and marking of containers - in accordance with GOST 18160-72.

    (Changed edition, Amendment No. 3).

    APPLICATION
    Information

    WEIGHT OF STEEL WASHERS AND THEIR SPRING PROPERTIES

    Nominal thread diameter of bolt, screw, stud

    Theoretical weight 1000 pcs. steel washers, kg

    Calculated elastic force of washers made of steel 65G, N

    Types of washers

    Types of washers

    Lungs (L)

    Normal (N)

    Heavy (T)

    Extra heavy (OT)

    Lungs (L)

    Normal (N)

    Heavy (T)

    Extra heavy (OT)

    0,030

    0,017

    0,025

    26,5

    0,042

    0,030

    0,056

    14,7

    16,7

    57,8

    0,084

    (0,061)

    0,064

    0,105

    35,3

    (8,8)

    38,2

    0,094

    0,117

    21,6

    71,5

    0,129

    (0,190)

    0,129

    (0,189)

    0,273

    14,7

    (50,0)

    52,9

    (136)

    0,191

    (0,318)

    0,228

    (0,315)

    0,432

    28,4

    (67,6)

    71,5

    (158)

    0,378

    (0,560)

    0,376

    (0,487)

    0,827

    36,3

    (81,3)

    88,2

    (184)

    0,749

    0,936

    92,1

    0,827

    (1,046)

    1,034

    1,678

    71,5

    (69,6)



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