GOST 809-2014 Track Screws. General Specifications

GOST 809-2014

INTERSTATE STANDARD

TRACK SCREWS

General Specifications

Track wood screws. General technical specifications

ICS 45.080

Effective date 2015-03-01

Foreword

The objectives, basic principles and general rules for interstate standardization work are established by GOST 1.0 “Interstate standardization system. Basic provisions” and GOST 1.2 “Interstate standardization system. Interstate standards, rules and recommendations for interstate standardization. Rules for development, adoption, updating and withdrawal”

Information about the standard

2 SUBMITTED by Interstate Technical Committee for Standardization MTK 524 “Railway Transport”

3 ADOPTED by the Interstate Council for Standardization, Metrology and Certification (minutes dated June 25, 2014, No. 45)

The following voted in favor of adoption:

Short name of the country according to MC (ISO 3166) 004-97	Country code according to MC (ISO 3166) 004-97	Abbreviated name of the national standardization body
Azerbaijan	AZ	Azstandard
Armenia	AM	Ministry of Economy of the Republic of Armenia
Belarus	BY	Gosstandart of the Republic of Belarus
Georgia	GE	Gruzstandart
Kazakhstan	KZ	Gosstandart of the Republic of Kazakhstan
Kyrgyzstan	KG	Kyrgyzstandart
Moldova	MD	Moldova-Standard
Russia	RU	Rosstandart
Tajikistan	TJ	Tajikstandart
Turkmenistan	TM	Main State Service “Turkmenstandartlary”
Uzbekistan	UZ	Uzstandard
Ukraine	UA	Ministry of Economic Development of Ukraine

4 By Order No. 1468-st of the Federal Agency for Technical Regulation and Metrology dated October 30, 2014, interstate standard GOST 809-2014 was put into effect as a national standard of the Russian Federation on March 1, 2015.

5 SUPERSEDES GOST 809-71

6 EDITION (September 2019) with Amendment (IUS 12-2016)

Information on the entry into force (or termination) of this standard and amendments thereto in the territory of the above-mentioned states is published in the indexes of national standards issued in these states, as well as on the Internet websites of the relevant national standardization bodies.

In the event of revision, amendment or withdrawal of this standard, the relevant information will be published on the official website of the Interstate Council for Standardization, Metrology and Certification in the “Interstate Standards” catalogue

1 Scope

This standard applies to track screws (hereinafter - screws) used for fastening metal base plates or rails to rail sub-bases in rail fastening systems.

2 Normative references

This standard uses normative references to the following interstate standards:

GOST 9.301 Unified system of corrosion and ageing protection. Metallic and non-metallic inorganic coatings. General requirements

GOST 9.302 (ISO 1463-82, ISO 2064-80, ISO 2106-82, ISO 2128-76, ISO 2177-85, ISO 2178-82, ISO 2360-82, ISO 2361-82, ISO 2819-80, ISO 3497-76, ISO 3543-81, ISO 3613-80, ISO 3882-86, ISO 3892-80, ISO 4516-80, ISO 4518-80, ISO 4522-1-85, ISO 4522-2-85, ISO 4524-1-85, ISO 4524-3-85, ISO 4524-5-85, ISO 8401-86) Unified system of corrosion and ageing protection. Metallic and non-metallic inorganic coatings. Test methods

GOST 15.309-98 System for product development and production start-up. Testing and acceptance of manufactured products. Basic provisions

GOST 166 (ISO 3599-76) Vernier callipers. Technical specifications

GOST 380 Common quality carbon steel. Grades

GOST 1050 Metal products made of unalloyed structural quality and special steels. General specifications

GOST 1435 Bars, strips and coils of unalloyed tool steel. General specifications

GOST 5950 Bars, strips and coils of alloyed tool steel. General specifications

GOST 10702 Bar products made of unalloyed and alloyed structural steel for cold volumetric stamping. General specifications

GOST 15150 Machines, instruments and other industrial products. Versions for various climatic regions. Categories, operating, storage and transportation conditions as regards the effect of climatic environmental factors

GOST 18160 Fasteners. Packaging. Marking. Transportation and storage

GOST 18321-73 Statistical quality control. Methods of random sampling of unit production items

GOST 21014-88 Ferrous metal products. Terms and definitions of surface defects

GOST 26653 Preparation of general cargo for transportation. General requirements

If a reference document is cited without a date, the version currently in effect shall be used, including any amendments made to it. If a dated reference document has been superseded, the specified version of that document shall be used. If, after the adoption of this standard, an amendment affecting a provision to which a dated reference is made is introduced into the referenced document, that provision shall apply without regard to this amendment. If the referenced document is withdrawn without replacement, the provision in which the reference is made shall apply to the extent not affected by this reference.

3 Terms and definitions

This standard uses the following terms with corresponding definitions:

3.1 track screw: A metal shank with a screw thread and a special head, used for fastening metal base plates or rails to rail sub-bases in intermediate rail fastenings;

3.2 thread runout: The section in the transition zone from the thread to the plain part of the part, where the thread has an incomplete profile. [GOST 11708-82, clause 45]

3.3 owner of railway transport infrastructure: A legal entity or individual entrepreneur that owns, or holds under another legal title, public railway transport infrastructure and provides services for its use under a contract.

4.1 Main characteristics, material requirements

4.1.1 Screws are made of steel grades St3 to GOST 380, St20 to GOST 1050, St10kp and St20kp to GOST 10702.

4.1.2 Screws are made without a protective coating. At the request of the railway transport infrastructure owner, screws may have a zinc-chromate or zinc-passivated coating with a thickness of 9 to 18 µm. Coating requirements are per GOST 9.301.

4.1.3 The surface of screws must not have:

• cracks, delaminations and overheating marks;

• scratches and pits deeper than 0.3 mm;

• rounding of the square head edges that takes the square diagonal dimension beyond the limit value;

• rounding of the hexagon head edges toward its bearing surface and end face exceeding 6 mm;

• rounding of head edges that takes the hexagon dimensions beyond the smallest circumscribed circle diameter;

• shank curvature exceeding 0.5 mm for screws;

• head axis offset relative to the shank axis exceeding 1 mm;

• a depression at the end of the shank, for screws without a pointed end, deeper than 10 mm;

• die split seams higher than 0.5 mm and steps greater than 0.3 mm from die misalignment;

• burrs, nicks, dents and metal overflow exceeding 0.5 mm;

• torn and chipped thread crests, if their depth exceeds the limit deviations of the thread outer diameter, and if the total length of tears and chips exceeds half a thread turn.

4.1.4 The following are not considered rejectable defects:

• the presence of laps on the head surface resulting from burrs being pressed in, as well as burrs up to 0.5 mm resulting from flashless stamping;

• a reduction in thread profile height on two turns from the end of the shank, or on two turns at the start and end of the threaded part of the shank;

• incomplete thread rolling on the tapered part of the shank not exceeding 5 mm;

• rounding of the top end face of the head, for screws.

4.1.5 At the request of the railway transport infrastructure owner, screws shall be subjected to a cold bend test and shall withstand bending to an angle of 45° (outer) without signs of tears or cracks.

4.1.6 Screws with a hexagon head shall be subjected to a tensile test to determine the breaking load. The minimum breaking load is not less than 85,000 N. Failure must occur in the shank or thread. Failure of the screw at the head-to-shank transition is not permitted.

(Amendment)

4.2 Marking

The end face of each screw head shall be stamped with marking containing the trademark or code of the manufacturer.

The marking characters shall be not less than: height - 8.0 mm, thickness - 1.0 mm, relief - 0.5 mm.

4.3 Packaging

When screws are transported in containers, marking and packaging shall be per GOST 18160.

5.1 Test categories

5.1.1 To verify compliance of screws with the requirements of this standard, the following are performed:

• acceptance tests;

• type tests.

5.1.2 Acceptance of screws is carried out by the manufacturer’s technical inspection department. Acceptance is based on the results of acceptance tests.

Acceptance tests are carried out in accordance with GOST 15.309. Screws accepted by the manufacturer’s technical inspection department are presented for acceptance inspection to the customer’s representative upon request.

The results of screw acceptance are kept at the manufacturer for not less than three years from the date of manufacture.

5.2 Acceptance tests

5.2.1 Acceptance tests of screws are carried out by lots. A lot shall consist of screws of one design, made of one steel grade using one process, and submitted for acceptance under one document. The lot size shall not exceed 20,000 pcs.

To check the quality of screws, a “blind” random sampling method per GOST 18321-73 (subsection 3.4) is used to select from the lot:

• for checking appearance, surface quality, dimensions and marking of screws (see 4.1.3, 4.1.4, 4.2) - 0.1% of each lot, but not less than 10 pcs.;

• for checking the protective coating (see 4.1.2) - 2 pcs.;

• for bend and tensile tests (see 4.1.5, 4.1.6) - 8 pcs.

5.2.2 Shipped lots of screws shall be accompanied by a quality passport indicating:

• the name or trademark of the manufacturer and its address;

• design;

• the batch number and size;

• the steel grade;

• acceptance results.

Additional information not contradicting the requirements of this standard may be included in the quality passport.

The quality passport must be signed by representatives of the quality control department.

5.2.3 The parameters and procedure for acceptance tests are given in Table 1.

Table 1 - Parameters and procedure for conducting acceptance tests

Parameter checked	Clause, subclause of the standard containing the requirements checked during acceptance tests	Inspection method
1 Surface quality	4.1.3, 4.1.4	6.1
2 Bend test	4.1.5	6.4
3 Tensile test	4.1.6	6.6
4 Protective coating	4.1.2	6.5
5 Marking	4.2	6.7

5.3 Type tests

5.3.1 Type tests are carried out in case of changes to the screw manufacturing process, as well as changes to the materials used.

5.3.2 The procedure for conducting type tests and evaluating results is per GOST 15.309-98 (Annex A).

6 Test methods

6.1 The appearance of screws (presence of surface defects and product defects) (see 4.1.3 and 4.1.4) is checked visually, without the use of magnifying instruments.

Overheating marks (see 4.1.3) are identified per GOST 21014-88 (Table 1, item 32 “Scaliness”).

6.2 The curvature (shank bending) of a screw (see 4.1.3) is checked using the limit gauge given in Annex A.

6.3 The diagonal dimension of the square of a four-sided screw head (see 4.2) is checked at a distance of 5 mm from the end face.

The width across flats and the circumscribed circle diameter for screws with a hexagon head (see 4.2) are checked at the middle (by height) part of the head of design 4 screws.

6.4 The bend test of screws (see 4.1.5) is carried out in a vice or a special fixture with rounded jaws, the radius of which shall equal the diameter of the screw shank.

Screws are bent at the point of transition from full thread to thread runout.

Note - Flaking of minor laps that occurs during bending is not considered a rejectable defect.

6.5 The thickness of the protective coating layer is checked on the heads of screws. The method for checking the quality and thickness of the coating (see 4.1.2) is per GOST 9.302.

6.6 For the tensile test of whole screws (see 4.1.6), both ends are secured in the grips of a tensile testing machine and stretched until failure occurs. The grips for this test shall be set up so that the load is applied along the axis of the shank of the test specimen.

6.7 Inspection of the applied marking (see 4.2) is performed visually, without the use of magnifying instruments.

6.8 For the purposes of mandatory conformity confirmation, a sample is assembled from the lot that has passed acceptance tests, using the “blind” random sampling method per GOST 18321-73 (subsection 3.4):

• for checking appearance, surface quality, dimensions and marking of screws (see 4.2, 5.1.3-5.1.4, 5.2) - 0.1% of each lot, but not less than 5 pcs.;

• for inspection of the protective coating (see 5.1.2) - 1 pc.;

• for bending and tension tests (see 5.1.5, 5.1.6) - 4 pcs.

7 Transportation and storage

7.1 Transportation of screws is permitted by any mode of transport, subject to the rules of cargo carriage applicable to the respective mode of transport, taking into account full use of load capacity and the permissible overload in accordance with GOST 26653.

7.2 Storage conditions for screws without protective coating - 6 as per GOST 15150, for screws with protective coating - 8 as per GOST 15150.

8 Manufacturer’s warranty

Warranty service life of not less than 100 million gross tonnes of cargo passed, but not more than three years from the date of installation in the track.

Appendix A (mandatory)

Note - Gauge material: steel grade KhVG per GOST 5950 or U10 per GOST 1435. Hardness 58-62 HRC.

Figure A1 - Gauge for checking screw curvature