SIST EN 15048-1:2007

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Garnituren für nicht planmäßig vorgespannte Schraubenverbindungen für den Metallbau - Teil 1: Allgemeine AnforderungenBoulonnerie de construction métallique non précontrainte - Partie 1 : Exigences généralesNon-preloaded structural bolting assemblies - Part 1: General requirements21.060.10Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN 15048-1:2007SIST EN 15048-1:2007en,fr,de01-september-2007SIST EN 15048-1:2007SLOVENSKI
STANDARD



SIST EN 15048-1:2007



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15048-1April 2007ICS 21.060.01 English VersionNon-preloaded structural bolting assemblies - Part 1: GeneralrequirementsBoulonnerie de construction métallique non précontrainte -Partie 1 : Exigences généralesGarnituren für nicht planmäßig vorgespannteSchraubenverbindungen für den Metallbau - Teil 1:Allgemeine AnforderungenThis European Standard was approved by CEN on 18 September 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15048-1:2007: ESIST EN 15048-1:2007



EN 15048-1:2007 (E) 2 Contents Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.6 4 Requirements.6 5 Testing for conformity evaluation.13 6 Evaluation of conformity.15 7 Documentation of test results.19 Annex ZA (informative)
Clauses of this European Standard addressing the provisions of EU Construction Products Directive (89/106/EEC dated 21 December 1988).20 Bibliography.25
SIST EN 15048-1:2007



EN 15048-1:2007 (E) 3 Foreword This document (EN 15048-1:2007) has been prepared by Technical Committee CEN/TC 185 “Fasteners”, the se-cretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2007, and conflicting national standards shall be withdrawn at the latest by October 2009. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun-tries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Den-mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 15048-1:2007



EN 15048-1:2007 (E) 4 Introduction Rules for design and execution of bolted connections with non-preloaded low strength or high-strength structural bolts respectively are defined for instance in EN 1993-1-8 (Eurocode 3) and prEN 1090-2. The parts of this European Standard on structural bolting specify the general requirements which ensure that bolt/nut/washer assemblies are suitable for use in non preloaded structural bolting. They can be used in shear con-nections and/or in tension connections if no preload is required. Structural fasteners which meet the requirements of this part of this European Standard have been designed to allow tensile loading of at least fub × As as defined in EN 1993-1-8. Structural fasteners which meet the requirements of EN 14399-1 are suitable for use in preloaded and non-preloaded structural bolting. This European Standard deals with structural fasteners which are intended for use as non-preloaded assemblies. Since the tensile resistance of bolt/nut assemblies is very sensitive to differences in manufacture, it is important that the assemblies are supplied by one manufacturer who is always responsible for the function of the assembly. For the same reason it is important that coating of the assemblies is under the control of one manufacturer. Beside the mechanical properties of the components the functionality of the assembly requires that the required tensile resistance is achieved. For this purpose the tensile test of assemblies is a means to check whether the func-tion of the assembly is fulfilled. SIST EN 15048-1:2007



EN 15048-1:2007 (E) 5 1 Scope This part of this European Standard specifies the general requirements for the components of bolt/nut/washer assemblies for non-preloaded structural bolting and for the assemblies themselves. It applies to bolts (including screws, studs and stud bolts) and nuts made of carbon steel, alloy steel and stainless steel with the following property classes:  bolts made of carbon steel and alloy steel: 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 10.9;  nuts made of carbon steel and alloy steel: 4, 5, 6, 8, 10, 12;  bolts made of austenitic stainless steel: 50, 70, 80;  nuts made of austenitic stainless steel: 50, 70, 80;  if appropriate, washers according to hardness class HV 100 or HV 200. NOTE The property classes 4.8, 5.8 and 6.8 may be subjected to limitations of use, it is recommended to refer to prEN 1090-2. The standard applies to thread sizes from M12 to M36 and to the associated washers but does not preclude the use of other sizes. Bolted connections with components according to this European Standard are able to be shear and/or tensile loaded. Bolts, nuts and washers according to this European Standard are not normally intended for welding. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. prEN 1090-2:2005, Execution of steel structures and aluminium structures - Part 2: Technical requirements for the execution of steel structures EN 1993-1-8:2005, Eurocode 3: Design of steel structures - Part 1-8: Design of joints EN 10045-1, Metallic materials — Charpy impact test — Part 1: Test method EN 10204, Metallic products — Types of inspection documents EN 15048-2, Non-preloaded structural bolting assemblies — Part 2: Suitability test EN 20898-2, Mechanical properties of fasteners — Part 2: Nuts with specified proof load values — Coarse thread (ISO 898-2:1992) EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs (ISO 898-1:1999) EN ISO 3506-1, Mechanical properties of corrosion-resistant stainless-steel fasteners — Part 1: Bolts, screws and studs (ISO 3506-1:1997) EN ISO 3506-2, Mechanical properties of corrosion-resistant stainless-steel fasteners — Part 2: Nuts
(ISO 3506-2:1997) EN ISO 6507-1, Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1:2005) EN ISO 9001, Quality management systems - Requirements (ISO 9001:2000) SIST EN 15048-1:2007



EN 15048-1:2007 (E) 6 3 Terms and definitions For the purposes of this document, the terms and definitions given in prEN 1090-2:2005 and the following apply. 3.1 assembly comprises matching bolt, nut and washer(s) (as necessary) with the same coating if any 3.2 manufacturing lot quantity of fasteners of a single designation including product grade, property class and size1), manufactured from bar, wire, rod or flat product from a single cast, processed through the same or similar steps at the same time or over a continuous time period through the same heat treatment and/or coating process, if any Same heat treatment or coating process means: — for a continuous process, the same treatment cycle without any setting modification; — for a discontinuous process, the same treatment cycle for identical consecutive loads (batches). NOTE The manufacturing lot may be split into a number of manufacturing batches for processing purposes and then reas-sembled into the same manufacturing lot. [ISO 15330:1999] 3.3 assembly lot assemblies supplied together as a set comprising:  bolts from a single manufacturing lot;  nuts from a single manufacturing lot 3.4 extended assembly lot manufacturing lot of that component that mainly influences the result of the suitability test combined with the other components from the same supplier chosen by a documented method NOTE The component with the main influence is determined on the basis of test results. 4 Requirements 4.1 Ordering information At the time of order the manufacturer shall obtain the following information: a) reference to this standard; b) the quantities to be delivered; c) the complete product designation2); d) other requirements as agreed with the purchaser (e. g. low temperature requirements).
1) Size of a bolt means thread diameter and length. 2) The complete product designation of the assembly includes the designation and reference standard(s), if any, or the specifi-cation of each component. SIST EN 15048-1:2007



EN 15048-1:2007 (E) 7 4.2 Manufacturing process 4.2.1 Dangerous substances Materials used in products shall not release any dangerous substances in excess of the maximum permitted levels specified in a relevant European Standard for the material or permitted in the national regulations of the member state of destination. 4.2.2 Material Free cutting steel shall not be used for the manufacture of bolts and nuts for structural bolting. 4.2.3 Nuts Hot dip galvanized nuts shall be galvanized before they are threaded. Nuts shall not be re-threaded after galvaniz-ing. 4.2.4 Bolts The manufacturing process for bolts of property class 10.9 shall take into account the risk of hydrogen
embrittlement, especially during the coating process.
NOTE Appropriate additional processes should be considered when the risk of hydrogen embrittlement cannot be avoided.
4.2.5 Finish and coating Finish and coating, if applied, shall be as specified in the relevant coating standards. Coatings shall not impair the mechanical properties or the functional characteristics of the assembly. Coatings of cadmium or cadmium alloy are not permitted. Coating of all components of an assembly shall be compatible and shall have equivalent corrosion resistance. Coating of each component shall be under the control of the manufacturer of the assemblies. 4.3 Delivery conditions All fasteners shall be supplied to the purchaser either in the original unopened, single sealed container or alterna-tively in separate sealed containers by the manufacturer of the assemblies. The suitability for tensile loading of the assembly supplied to the purchaser shall be demonstrated by the tensile test according to EN 15048-2. Containers of bolt/nut assemblies or their components according to this European Standard shall be labelled with the complete designation of the fasteners including:  additional letters "SB" (for use in Structural Bolting),  relevant lot number(s) and
 identification of the manufacturer of the assembly. Washers are usually supplied in separate containers. Assemblies shall be supplied in one of the following alterna-tives: a) Bolts and nuts supplied by one manufacturer. The elements of an assembly shall be packed together in one package that is labelled with an assembly lot number and the manufacturer's identification. The suitability test is to be performed on each assembly lot by use of representative sample testing as specified in 6.3. b) Bolts and nuts supplied by one manufacturer. Each element shall be packed in separate packages that are labelled with the manufacturing lot number of the components and the manufacturer's identification. The ele-ments in an assembly are freely interchangeable within the deliveries of one nominal thread diameter. The SIST EN 15048-1:2007



EN 15048-1:2007 (E) 8 suitability test is to be performed on each extended assembly lot by use of representative sample testing as specified in Table 17. 4.4 Product requirements 4.4.1 Dimensions and tolerances on dimensions, form and position Dimensions, tolerances on dimensions, form and position shall be in accordance with the manufacturer’s declara-tion by reference to the relevant European or international product standard. For coated fasteners the tolerances shall apply to the parts before coating except the threads of hot dip galvanized nut which are cut after coating. Any suitable thread length may be used. Attention is drawn to the requirements of execution standards. NOTE For metallic structures EN 1090 applies. Any suitable head shape and shank dimensions may be used provided that the requirements for tensile resistance are met. 4.4.2 Mechanical characteristics of the components of the assembly 4.4.2.1 General The mechanical characteristics of the components shall comply with the specifications in Tables 1 to 4. 4.4.2.2 Bolts Table 1 — General mechanical characteristics of bolts Mechanical characteristic Relevant standard for property class
carbon steel and alloy steel 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 10.9 stainless steel 50, 70, 80 Elongation after fracture
EN ISO 898-1
EN ISO 3506-1 Minimum tensile strength
EN ISO 898-1
EN ISO 3506-1 Lower yield strength or
Stress at 0,2 % non-proportional elongation
EN ISO 898-1
EN ISO 3506-1 Stress under proof load
EN ISO 898-1
not applicable Strength under wedge loading
EN ISO 898-1
not applicable Hardness
EN ISO 898-1
not applicable
SIST EN 15048-1:2007



EN 15048-1:2007 (E) 9 Table 2 — Minimum impact strength of bolts For property classes carbon steel and alloy steel stainless steel Characteristic 4.6, 5.6, 8.8, 10.9 4.8, 5.8, 6.8 50, 70, 80 Impact strength KV,min
at – 20 °C 27 J — 27 Ja Impact strength KV,min
at + 20 °C — 27 J — a Impact strength may be tested at – 60 °C, if required, with a minimum impact strength of KV =27 J.
4.4.2.3 Nuts Table 3 — Nuts Relevant standard for property class Mechanical characteristic carbon steel and alloy steel 4, 5, 6, 8, 10, 12 stainless steel 50, 70, 80 Stress under proof load EN 20898-2 EN ISO 3506-2 Hardness EN 20898-2 not applicable
4.4.2.4 Washers Table 4 — Washers Mechanical characteristic For all carbon steel, alloy steel and stainless steel bolt property classes
For property classes 8.8 and 10.9 in a single lap joint according to EN 1993-1-8:2005, 3.6.1 Hardness minimum 100 HV 300 HV to 370 HV
4.4.3 Characteristics of the assembly 4.4.3.1 Appropriate combinations of bolts, nuts and washers The appropriate combinations of bolts, nuts and washers with regard to product grades given in Table 5 and with regard to property classes given in Table 6 shall be used. Table 5 — Appropriate combinations of bolts, nuts and washers with regard to product grades according to EN ISO 4759 Bolts Nuts Washers Product grade A or B Product grade A, B or C Product grade A or C Product grade C Product grade A, B or C Product grade C
SIST EN 15048-1:2007



EN 15048-1:2007 (E) 10 Table 6 — Appropriate combinations of bolts, nuts and washers with regard to property classes Assemblies made of carbon steel or alloy steel Bolts Nuts Washers Property class Property class Hardness 4.6 4.8 4, 5, 6 or 8 5.6 5.8 5, 6 or 8 6.8 6 or 8 100 HV min. 8.8 8 or 10 10.9 10 or 12 100 HV min. or
300 HV min. a Assemblies made of stainless steel Bolts Nuts Washers Grade Property class Property class Hardness 50 50, 70 or 80 70 70 or 80 A2, A3, A4 or A5 80 80 100 HV min. a 300 HV min. is required for property classes 8.8 and 10.9 in a single lap joint with only one bolt or single row of bolts according to EN 1993-1-8:2005, 3.6.1.
4.4.3.2 Tensile resistance of bolt/nut assemblies The minimum tensile resistance of the bolt/nut assembly shall comply with the values specified in Tables 7 and 8. The values are based on the minimum tensile strength (Rm, min). The tensile resistances shall apply to any bolt/nut combination as specified in Tables 5 and 6. SIST EN 15048-1:2007



EN 15048-1:2007 (E) 11 Table 7 — Tensile resistance of bolt/nut assemblies made of carbon steel and alloy steel Property class 4.6 4.8 5.6 5.8 6.8 8.8 10.9 Thread Nominal stress area As, nom mm2 Minimum tensile resistance (As, nom × Rm, min), in N M12
84,3
33 700
35 400
42 200
43 800
50 600
70 000
87 700 M14
115
46 000
48 300
57 500
59 800
69 000
95 500 120 000 M16
157
62 800
65 900
78 500
81 600
94 000 130 000 163 000 M18
192
76 800
80 600
96 000 99 800 115 000 159 000 200 000 M20
245
98 000 103 000 122 000 127 000 147 000 203 000 255 000 M22
303 121 000 127 000 152 000 158 000 182 000 252 000 315 000 M24
353 141 000 148 000 176 000 184 000 212 000 293 000 367 000 M27
459 184 000 193 000 230 000 239 000 275 000 381 000 477 000 M30
561 224 000 236 000 280 000 292 000 337 000 466 000 583 000 M33
694 278 000 292 000 347 000 361 000 416 000 576 000 722 000 M36
817 327 000 343 000 408 000 425 000 490 000 678 000 850 000 NOTE To achieve full tensile resistance, hot dip galvanized assemblies can require special measures, see EN ISO 10684:2004, Annex F.
Table 8 — Tensile resistance of bolt/nut assemblies made of stainless steel Property class 50 70 80 Thread Nominal stress area As, nom mm2 Minimum tensile resistance (As, nom × Rm, min), in N M12
84,3
42 200
59 000
67 400
M14
115
57 500
80 500
92 000
M16
157
78 500 110 000
126 000
M18
192
96 000 134 000
154 000
M20
245 122 000 172 000
196 000
M22
303 152 000 212 000
242 000
M24
353 176 000 247 000
282 000
M27
459 230 000 321 000a 367 000a M30
561 280 000 393 000a 449 000a M33
694 347 000 486 000a 555 000a M36
817 408 000 572 000a 654 000a a The tensile resistance shall apply for assemblies of studs or stud bolts with two nuts only. These sizes are not included in EN ISO 3506,because they are difficult to manufacture.
SIST EN 15048-1:2007



EN 15048-1:2007 (E) 12 4.4.4 Marking 4.4.4.1 Bolts Bolts, screws or studs according to this European Standard shall be marked with:  the property class marking in accordance with EN ISO 898-1 or EN ISO 3506-1,  the identification mark of the manufacturer of the assembly and  the special marking "SB" (for use in Structural Bolting). The marking may be either embossed or indented on the top surface of the head or on the end of studs or stud bolts.
Key 1
Identification mark of the manufacturer of the assembly Figure 1 - Example of bolt marking
4.4.4.2 Nuts Nuts according to this European Standard shall be marked with:  the property class marking in accordance with EN 20898-2 or EN ISO 3506-2,  the identification mark of the manufacturer of the assembly,  the special marking "SB" (for use in Structural Bolting). The marking may be either indented or embossed on one of the bearing surfaces.
Key 1
Identification mark of the manufacturer of the assembly Figure 2 - Example of nut marking SIST EN 15048-1:2007



EN 15048-1:2007 (E) 13
4.4.4.3 Washers Washers without special marking may be used, because they are of minor importance for shear or tensile resis-tance of the assemblies. 4.5
Durability Finish and coating of assemblies shall be in accordance with 4.2.5. A surface coating can be used to enhance the inherent durability of assemblies against corrosion, if required. This durability can be achieved either by applying a specified coating, or as part of the durability of the structure in which the assemblies are used. NOTE prEN 1090-2 gives information about EN and ISO standards for durability of structures against corrosion, protective coatings and method of application. The mechanical durability of assemblies shall be assured for a reasonable economic working life if the assembly complies with the requirements of this standard and is used in accordance with the manufacturer's specification for tightening. 5 Testing for conformity evaluation 5.1 Testing for dangerous substances Release of dangerous substances may be assessed indirectly by controlling the content of the substances in the materials used. 5.2 Testing of dimensional requirements of the components The tolerances of critical dimensions of the components shall be checked by standard gauges or measuring equipment of the required accuracy as given in Tables 9 to 11. Table 9 — Bolts Critical dimensiona Accuracy (mm) Method Width across flats (s) or head diameter (dk)
≤ 0,05
Measurement Width across corners (e)
≤ 0,05
Measurement Head height (k)
≤ 0,05
Measurement Shank diameter (ds)
≤ 0,05
Measurement Nominal length (l)
≤ 0,1
Measurement Shank length (ls)
≤ 0,1
Measurement Grip length (lg)
≤ 0,1
Measurement Thread dimensions —
Gauge Head angle (of countersunk bolts) (α)
≤ 0,5°
Measurement a Symbols and descriptions of dimensions as defined in EN 20225.
SIST EN 15048-1:2007



EN 15048-1:2007 (E) 14
Table 10 — Nuts Critical dimensiona Accuracy (mm) Method Width across flats (s)
≤ 0,05
Measurement Width across corners (e)
≤ 0,05
Measurement Nut height (m)
≤ 0,05
Measurement Thread dimensions —
Gauge a Symbols and descriptions of dimensions as defined in EN 20225.
Table 11 — Washers Critical dimensiona Accuracy (mm) Method Hole diameter (d1)
≤ 0,1/—
Measurement/Gauge Outer diameter (d2)
≤ 0,1
Measurement Thickness (h)
≤ 0,05
Measurement a Symbols and descriptions of dimensions as defined in EN ISO 4759-3.
5.3 Testing of mechanical characteristics of components The mechanical characteristics of bolts, nuts and washers shall be tested in accordance with Tables 12 to 14. Table 12 — Bolts Reference standard for the test procedure Mechanical characteristic Test carbon steel
and alloy steel stainless steel Elongation after fracture Tensile test EN ISO 898-1 EN ISO 3506-1 Minimum tensile strength Tensile test EN ISO 898-1 EN ISO 3506-1 Lower yield stress or
Stress at 0,2% non-proportional elongation Tensile test EN ISO 898-1 EN ISO 3506-1 Stress under proof load Proof load test EN ISO 898-1 not applicable Strength under wedge loading Wedge loading test EN ISO 898-1 not applicable Hardness Hardness test EN ISO 898-1 not applicable Impact strength Impact test EN 10045-1 EN 10045-1
Table 13 — Nuts Reference standard for the test procedure Mechanical characteristic Test carbon steel and alloy steel stainless steel Stress under proof load Proof load test EN 20898-2 EN ISO 3506-2 Hardness Hardness test EN 20898-2 not applicable
SIST EN 15048-1:2007



EN 15048-1:2007 (E) 15 Table 14 — Washers Mechanical characteristic Test Reference standard for the test procedure Hardness Hardness test EN ISO 6507-1
5.4 Testing of functional characteristics of assemblies The test of functional characteristics shall be in accordance with Table 15. Table 15 — Testing of assemblies Functional characteristic Test Reference standard for the test procedure Tensile resistance Tensile test of assembly EN 15048-2
5.5 Acceptance criteria All fasteners tested for conformity evaluation shall pass the tests to be in conformance with this standard. 6 Evaluation of conformity 6.1
General The conformity of the components and assemblies to the requirements of this standard and with the stated values shall be demonstrated by: a) initial type testing; b) factory production control by the manufacturer, including product assessment. For the purposes of testing, the products may be grouped into families, where it is considered that the selected properties are common to all the products within that family. 6.2 Initial type testing 6.2.1 General An initial type test is the complete set of tests or other procedures, determining the performance of samples of products representative of the product type. Initial type testing shall be performed to show conformity with this standard on first use of this standard for products being put onto the market and: a) at the beginning of the production of a new or modified assembly design, raw material or source or supplier of the raw material or the components insofar as such a change would affect the declared performance charac-teristics; b) at the beginning of a new or modified method of production. In case of type testing on products for which initial type testing in accordance with this standard was already per-formed, type testing may be reduced: c) if it has been established that the performance characteristics compared with the already tested products have not been affected, or d) in accordance with the rules for grouping and/or direct application or application by extrapolation of test results. SIST EN 15048-1:2007



EN 15048-1:2007 (E) 16 Assemblies CE marked in accordance with appropriate harmonised European specifications may be presumed to have the performance stated with the CE marking, although this does not replace the responsibility of the assembly manufacturer to ensure that the assembly is correctly designed and its components have the necessary perform-ance values to meet the design. 6.2.2 Characteristics All characteristics in 4.4 shall be subject to initial type testing, with the following exception:  release of dangerous substances may be assessed indirectly by controlling the content of the substance con-cerned. 6.2.3 Use of historical data Tests previously performed on the same products in accordance with the provisions of this standard (same characteristic(s), test method, sampling procedure, system of attestation of conformity, etc.) may be taken into account. 6.2.4 Treatment of calculated values and design In some cases, the manufacturer may produce products in accordance with a design and/or calculations provided by a third party. In this case, verification will not be of the design or calculations themselves, but only on the fact that the products conform to the assumptions of the design and/or calculations. 6.2.5 Sampling, testing and conformity criteria 6.2.5.1 Sampling Initial type testing shall be performed on samples of products representative for the manufactured product type. 6.2.5.2 Testing and conformity criteria The number of bolts, nuts and washers and assemblies to be tested shall be in accordance with Table 16. Table 16 — Number of samples to be tested and conformity criteria for initial type testing
and periodical audit Number of tests Characteristics Requirement clause Test method Initial typetesting Periodical audit Conformitycriteria Bolts Dimensions and tolerances 4.4.1 according to 5.2 a b c Elongation after fracture 4.4.2 Tensile test a b c Minimum tensile strength 4.4.2 Tensile test a b c Lower yield strength or Stress at 0,2 %
non-proportional elonga- tion 4.4.2 Tensile test a b c Stress under proof load 4.4.2 Proof load test a b c Strength under wedge
loading 4.4.2 Wedge loading testa b c Hardness 4.4.2 Hardness test a b c Impact strength 4.4.2 Impact test a b c Nuts Dimensions 4.4.1 according to 5.2 a b c Stress under proof load 4.4.2 Proof load test a b c Hardness 4.4.2 Hardness test a b c SIST EN 15048-1:2007



EN 15048-1:2007 (E) 17 Table 16 (continued) Number of tests Characteristics Requirementclause Test method Initial typetesting Periodical audit Conformitycriteria Washers Dimensions 4.4.1 according to 5.2 a b c Hardness 4.4.2 Hardness test a b c Assemblies Tensile resistance 4.4.3 Suitability test a b c a Initial types shall be selected to encompass different nominal diameters, different manufacturing methods, different property classes, different types of coating and different types and sources of material, taking 6.2.1 and 6.2.3 into ac-count. For characteristics affected by nominal diameter, all diameters shall be covered. If there are more than four diame-ters in the family, then the range of diameter
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