GOST 16018-2014 Nuts for Clamp Bolts and Insert Bolts of Rail Fastenings for Railway Track. Technical Specifications

GOST 16018-2014

INTERSTATE STANDARD

NUTS FOR CLAMP BOLTS AND INSERT BOLTS OF RAIL FASTENINGS FOR RAILWAY TRACK

Technical specifications

Nuts for clamp and inserted bolts of rail track fastenings. Technical specification

ICS 45.080

Effective date 2015-02-01

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 the Interstate Technical Committee for Standardization “Railway Transport” No. 524 (ISC 524)

3 ADOPTED by the Interstate Council for Standardization, Metrology and Certification (Minutes No. 67-P dated May 30, 2014)

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	Gospotrebstandart of Ukraine

4 By Order No. 1466-st of the Federal Agency for Technical Regulation and Metrology dated October 30, 2014, interstate standard GOST 16018-2014 was put into effect as a national standard of the Russian Federation on February 1, 2015.

5 This standard may be applied on a voluntary basis to comply with the requirements of the Customs Union technical regulations:

“On the safety of high-speed railway transport”;

“On the safety of railway transport infrastructure”

6 SUPERSEDES GOST 16018-79

7 EDITION (December 2019) with Amendment (ISU 7-2015), with Change (ISU 3-2019)

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 nuts for clamp bolts and insert bolts (hereinafter referred to as nuts) used for rail fastenings of railway track, and establishes technical requirements and test methods.

2 Normative references

This standard uses normative references to the following interstate standards:

GOST 9.014 Unified system of corrosion and ageing protection. Temporary corrosion protection of products. General requirements

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

GOST 9.302 Unified system of corrosion and ageing protection. Metallic and non-metallic inorganic coatings. Test methods

GOST ISO 3269 Fasteners. Acceptance inspection

GOST 15.309 System for product development and production launch. Testing and acceptance of manufactured products. General provisions

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

GOST 1759.3 Nuts. Surface defects and test methods*

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• In the Russian Federation, GOST ISO 6157-2-2015 “Fasteners. Surface discontinuities. Part 2. Nuts” is in effect.

GOST 1759.5 (ISO 898-2-80) Nuts. Mechanical properties and test methods**

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** In the Russian Federation, GOST ISO 898-2-2015 “Mechanical properties of fasteners made of carbon and alloy steel. Part 2. Nuts with specified property classes with coarse pitch and fine pitch thread” is in effect.

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 16093 (ISO 965-1:1998, ISO 965-3:1998) Basic standards of interchangeability. Metric thread. Tolerances. Clearance fits

GOST 18160 Fasteners. Packaging. Marking. Transportation and storage

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

GOST 24705 (ISO 724:1993) Basic standards of interchangeability. Metric thread. Basic dimensions

GOST 24997 (ISO 1502:1996) Gauges for metric threads. Tolerances

GOST ISO 3269 Fasteners. Acceptance inspection

(Amended edition, Amendment No. 1).

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

3.2 clamp bolt: A fastener in the form of a rod with external thread at one end and a head at the other, forming a connection by means of a nut, used to secure the rail to the base plate in separate-type rail fastenings;

3.3 insert bolt: A fastener in the form of a rod with external thread at one end and a head at the other, forming a connection by means of a nut, used to secure a metal base plate or rail to a reinforced-concrete sub-rail base in separate-type and non-separate-type rail fastenings.

3.4 customer: An enterprise (organization, association or other entity engaged in economic activity) at whose request or under contract with which products are developed and/or supplied.

(Added, Amendment No. 1).

4 Classification, basic parameters and dimensions

4.1 By design parameters, nuts are classified as follows:

• nuts with double-sided outer and inner chamfers (see Figure 1, version 1), height 11, 20 and 18 mm;

• nuts with double-sided outer chamfer and single-sided inner chamfer (see Figure 1, version 2), height 22 mm;

• nuts without outer chamfers and with a single-sided inner chamfer (see Figure 1, version 3), height 22 mm.

4.2 The design and dimensions of nuts shall comply with those shown in Figure 1.

Designation examples

Nut, version 1, thread diameter 22 mm, coarse pitch thread, tolerance class 7H, property class 5, made of killed steel, with zinc chromate coating (01) 9 µm thick (9):

Nut M22-7H.5.019 GOST 16018-2014

Same, version 3, made of free-cutting steel without zinc coating:

Nut 3M22-7H.5.A GOST 16018-2014

(Amended edition, Amendment No. 1).

• Dimensions, including those subject to inspection for confirmation of the minimum required safety requirements.

Figure 1, sheet 1 - Nut

• Dimensions, including those subject to inspection for confirmation of the minimum required safety requirements.

Figure 1, sheet 2

5.1 Basic characteristics, material requirements

5.1.1 The mechanical properties of nuts shall comply with property class 5 or 6 per GOST 1759.5*.

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• GOST ISO 898-2-2015 is in effect.

5.1.2 Nuts are supplied without a protective coating. By agreement with the infrastructure owner/customer, nuts may be manufactured with a protective coating. In this case, the protective coating and coating thickness must be the same as those of the bolts they are assembled with. Coating requirements are per GOST 9.301. Requirements for the thickness of the metallic protective coating are per GOST 9.303.

(Amended edition, Amendment No. 1).

5.1.3 Thread per GOST 24705. Tolerance class - 7H per GOST 16093.

5.1.4 The offset of the nut hole axis relative to the axis of symmetry must not exceed 0.9 mm.

5.1.4a The deviation from perpendicularity of the nut’s bearing surfaces relative to the thread axis must not exceed 0.8 mm.

The deviation from perpendicularity of the nut’s hexagon faces relative to the bearing surface must not exceed 0.8 mm.

5.1.4a (Added additionally, Amendment No. 1).

5.1.5 For nuts of design 3, metal draw-down resulting in a local reduction of rib height of no more than 3 mm is permitted.

5.1.6 Permissible surface defects - per GOST 1759.3**.

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** GOST ISO 6157-2-2015 “Fasteners. Surface discontinuities. Part 2. Nuts” is in effect.

5.1.7 After testing for threefold tightening and loosening, there must be no:

• damage to the nut threads preventing their reuse;

• jamming or slipping when the nuts are screwed onto the bolt thread.

(Amended edition, Amendment No. 1).

5.2 Marking

5.2.1 A raised or recessed marking must be applied to one of the bearing surfaces of the nut.

(Amended edition, Amendment No. 1).

5.2.2 The marking includes:

• the property class designation (Arabic numerals);

• the trademark or code of the manufacturer.

5.3 Packaging

5.3.1 Marking of containers and packaging of nuts for transport as separate items is per GOST 18160. Packaging of nuts in specialized flexible containers made of polypropylene fabric is permitted.

(Added, Amendment No. 1).

5.3.2 Packaging of nuts together with bolts of the same design and length in a single container is permitted.

6.1 Test categories

6.1.1 To verify compliance of nuts with the requirements of this standard, the following are performed:

• acceptance tests;

• periodic tests;

• type tests.

(Added, Amendment No. 1).

6.1.2 Acceptance of nuts is carried out by the manufacturer’s quality control department. Acceptance is based on the results of acceptance tests.

Acceptance tests are conducted in accordance with GOST 15.309. Nuts accepted by the manufacturer’s quality control department are presented for acceptance inspection to the customer’s representative upon request.

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

6.2 Acceptance tests

6.2.1 Acceptance tests of nuts are performed by lots. A lot must consist of items of the same design, made from a single steel grade using a single manufacturing process. Acceptance rules must comply with GOST ISO 3269 for items of product grade B.

(Amended edition, Amendment No. 1).

6.2.2 Shipped lots of nuts must be accompanied by a quality passport, which indicates:

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

• lot number;

• the weight of the lot;

• the diameter and design type of the nuts;

• the property class, steel grade;

• the type of temporary anti-corrosion protection and the protection period;

• the date of manufacture, the 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.

6.2.3 The parameters and procedure for conducting 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 Dimensions	4.1, 4.2, 5.1.3-5.1.5	7.1-7.4
2 Surface quality	5.1.6	7.5
3 Mechanical properties	5.1.1	7.6
4 (Deleted, Amendment No. 1).
5 Protective coating	5.1.2	7.8
6 Marking	5.2	7.9

6.3 Type tests

6.3.1 Type tests are performed in the event of a change in the manufacturing process of the nuts, as well as in the event of a change in the materials used.

6.3.2 The procedure for conducting type tests and evaluating the results is per GOST 15.309 (Annex A).

6.4 Periodic tests

6.4.1 Periodic tests include testing for threefold tightening and loosening in accordance with 5.1.7.

6.4.2 Periodic tests are conducted on nuts selected from any lot of nuts that has passed acceptance tests, at a frequency of not less than once a week.

6.4.3 The following requirements are taken into account when selecting samples and conducting nut tests:

• nuts for testing are selected by the “blind” method per GOST 18321-73 (subsection 3.4);

• the number of nuts for testing is not less than five pieces.

6.4.4 When manufacturing nuts from a new metal melt, periodic tests must be conducted in compliance with the requirements of 6.4.1-6.4.3.

6.4 (Added additionally, Amendment No. 1).

7 Inspection methods

7.1 The width across flats (see 4.2), the diameter of the circumscribed circle (see 4.2), and the height of the nut (see 4.1, 4.2, 5.1.5) are checked in the middle part of the nut using a caliper with technical requirements complying with GOST 166.

7.2 The offset of the nut hole axis relative to the axis of symmetry (see 5.1.4) is determined as the difference between measurements taken at the points of minimum and maximum wall width of the nut using a caliper with technical requirements complying with GOST 166.

7.3 The deviation from perpendicularity of the nut’s bearing surfaces relative to the thread axis (see 4.2) is checked with a feeler gauge, measuring the clearance between each bearing surface of the nut and the end face of a check ring, screwed onto a threaded mandrel until they come into contact with each other. The thread accuracy of the check ring and mandrel must correspond to the thread accuracy of the nut being checked.

The deviation from perpendicularity of the nut’s hexagon faces relative to the bearing surface (see 4.2) is checked with an angle template or a feeler gauge, measuring the clearance between the hexagon face and a square.

7.1, 7.2, 7.3 (Amended version, Amendment No. 1).

7.4 Thread size (see 5.1.3) - with limit gauges per GOST 24997.

7.5 Inspection of surface defects (see 5.1.6) - per GOST 1759.3*.

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• GOST ISO 6157-2-2015 “Fasteners. Surface discontinuities. Part 2. Nuts” is in effect.

7.6 Testing of mechanical properties of nuts (see 5.1.1) - per GOST 1759.5**.

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** GOST ISO 898-2-2015 “Mechanical properties of fasteners made of carbon and alloy steel. Part 2. Nuts with specified property classes with coarse and fine pitch thread” is in effect.

7.5, 7.6 (Added additionally, Amendment No. 1).

7.7 Testing for threefold tightening and loosening

7.7.1 Testing for threefold tightening and loosening (see 5.1.7) is conducted on an assembled threaded joint set of a KB-type intermediate rail fastening unit. The number of samples for testing and the requirements for their selection are in accordance with 6.4.2-6.4.4.

7.7.2 Testing is performed by screwing the nut onto the mating part (insert bolt or clamp bolt). The tightening force of the nuts during testing must correspond to a torque of: 200 N·m for clamp bolts, 150 N·m for insert bolts.

The operations of screwing on, tightening, and unscrewing the same nut are performed 3 times.

7.7.3 If, as a result of testing, at least one nut from the sample fails the threefold tightening and loosening test, repeat tests are conducted on double the number of samples from the lot from which the initial sample was taken. Repeat tests on the doubled sample are considered final and apply to the entire lot.

7.7.4 If unsatisfactory results are obtained during repeat testing, the lot is rejected; an analysis of the test results is conducted to identify the causes of the unsatisfactory test results, and a list is compiled of the identified defects, their causes, and measures to prevent the occurrence of defects.

7.7.5 If a batch of nuts is found to have failed the triple tightening and loosening test, the manufacturer must verify that the products released since the last check for triple tightening and loosening conform to this parameter.

7.7 (Revised edition, Amendment No. 1).

7.8 Quality control of the protective coating (see 5.1.2) - in accordance with GOST 9.302.

7.9 Inspection of the applied marking (see 5.2) is performed visually, without the use of magnifying devices.

7.10 For the purposes of mandatory conformity assessment, a sample is assembled from a batch that has passed acceptance testing, using the “blind” selection method in accordance with GOST 18321-73 (subsection 3.4), with a sample size in accordance with GOST ISO 3269 for product grade B items.

Samples for conformity assessment purposes are taken from a batch manufactured no earlier than six months before the start date of these activities.

(Amended edition, Amendment No. 1).

8 Transportation and storage

8.1 Nuts are shipped as a set together with clamp or embedded bolts for rail fastenings.

8.2 Transportation of nuts as separate items is permitted.

8.2a Transportation of nuts without packaging is not permitted.

8.2a (Added additionally, Amendment No. 1).

8.3 At the request of the infrastructure owner/customer, nuts without a protective coating are preserved in accordance with GOST 9.014 before packaging, for a period ensuring corrosion protection of at least one year.

(Amended edition, Amendment No. 1).

8.4 Storage conditions for nuts without a protective coating - 6 in accordance with GOST 15150; for nuts with a protective coating - 8 in accordance with GOST 15150.

9 Manufacturer’s warranty

The warranty service life is not less than five years from the date of installation on the track, provided the requirements for transportation, storage, installation on the track, and operation are observed.

Section 9 (Revised edition, Amendment No. 1).

Appendix A (informative)

The theoretical mass of 1000 nuts of designs 1 and 2 is 114 kg; of design 3 - 126 kg.

Notes

1 The mass of the nuts is determined based on nominal dimensions and a steel density of 7850 kg/m.

2 If the use of nuts of different designs is permitted, the design documentation indicates the largest of the theoretical mass values for these designs.

3 The change in the mass of 1000 nuts when their height changes by 1 mm must not exceed 6.5 kg.