INTERNATIONAL ISO STANDARD 898-2

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INTERNATIONALSTANDARDISO898-2Third edition2012-03-15Mechanical properties of fasteners madeof carbon steel and alloy steel —Part 2:Nuts with specified property classes —Coarse thread and fine pitch threadCaractéristiques mécaniques des éléments de fixation en acier aucarbone et en acier allié —Partie 2: Écrous de classes de qualité spécifiées — Filetages à pasgros et filetages à pas finReference numberISO 898-2:2012(E) ISO 2012

ISO 898-2:2012(E)COPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’smember body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. 41 22 749 01 11Fax 41 22 749 09 47E-mail copyright@iso.orgWeb www.iso.orgPublished in Switzerlandii ISO 2012 – All rights reserved

ISO 898-2:2012(E)Contents PageForeword. iv1Scope. 12Normative references. 23Symbols. 244.14.24.3Designation systems. 2Designation of nut styles. 2Designation of property classes. 2Ranges of nominal diameters in relation to nut style and property class. 35Design of bolt and nut assemblies. 36Materials. 47Mechanical properties. 588.18.28.3Inspection. 8Manufacturer’s inspection. 8Supplier’s inspection. 8Purchaser’s inspection. 899.19.29.3Test methods. 9Proof load test. 9Hardness test. 11Surface integrity inspection. 131010.110.210.310.410.510.6Marking. 13General. 13Identification mark of the manufacturer. 13Marking of property classes. 13Identification. 14Marking of left-hand thread. 15Marking of packages. 15Annex A (informative) Design principles of nuts. 16Annex B (informative) Thread dimensions for the test mandrel. 19Bibliography. 21 ISO 2012 – All rights reserved iii

ISO 898-2:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies(ISO member bodies). The work of preparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental andnon-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 898‑2 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners withmetric internal thread.This third edition cancels and replaces the second edition (ISO 898‑2:1992) and ISO 898-6:1994, which havebeen technically revised.ISO 898 consists of the following parts, under the general title Mechanical properties of fasteners made ofcarbon steel and alloy steel:—Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread—Part 2: Nuts with specified property classes — Coarse thread and fine pitch thread—Part 5: Set screws and similar threaded fasteners with specified hardness classes — Coarse thread andfine pitch thread—Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm1)1) It is intended that, upon revision, the main element of the title of Part 7 will be aligned with the main element of the titleof Part 1.iv ISO 2012 – All rights reserved

INTERNATIONAL STANDARD ISO 898-2:2012(E)Mechanical properties of fasteners made of carbon steel andalloy steel —Part 2:Nuts with specified property classes — Coarse thread andfine pitch thread1 ScopeThis part of ISO 898 specifies mechanical and physical properties of nuts with coarse thread and fine pitchthread made of carbon steel and alloy steel when tested at an ambient temperature range of 10 C to 35 C.Nuts conforming to the requirements of this part of ISO 898 are evaluated at that ambient temperature range.It is possible that they do not retain the specified mechanical and physical properties at elevated and/or lowertemperatures.NOTE 1Nuts conforming to the requirements of this part of ISO 898 have been used in applicationsranging from –50 C to 150 C. It is the responsibility of users to consult an experienced fastener materials expertfor temperatures outside the range of –50 C to 150 C and up to a maximum temperature of 300 C to determineappropriate choices for a given application.NOTE 2Information for the selection and application of steels for use at lower and elevated temperatures is given forinstance in EN 10269, ASTM F2281 and in ASTM A320/A320M.This part of ISO 898 is applicable to nuts:a)made of carbon steel or alloy steel;b)with coarse thread M5 D M39, and fine pitch thread M8 1 D M39 3;c)with triangular ISO metric thread according to ISO 68-1;d)with diameter/pitch combinations according to ISO 261 and ISO 262;e)with specified property classes, including proof load;f)with different nut styles: thin nuts, regular nuts and high nuts;g)with minimum height m 0,45D;h)with a minimum outside diameter or width across flats s 1,45D (see Annex A);i)able to mate with bolts, screws and studs with property classes according to ISO 898-1.For hot dip galvanized nuts, see ISO 10684.This part of ISO 898 does not specify requirements for properties such as:—prevailing torque properties (see ISO 2320);—torque/clamp force properties (see ISO 16047 for test method);—weldability;—corrosion resistance. ISO 2012 – All rights reserved 1

ISO 898-2:2012(E)2 Normative referencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenced document(including any amendments) applies.ISO 6157-2, Fasteners — Surface discontinuities — Part 2: NutsISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test methodISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test methodISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F,G, H, K, N, T)ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperatureISO 7500‑1, Metallic materials — Verification of static uniaxial testing machines — Part 1: Tension/compressiontesting machines — Verification and calibration of the force-measuring systemISO 16426, Fasteners — Quality assurance system3 SymbolsFor the purposes of this document, the following symbols apply.Dnominal thread diameter of the nut, in millimetresdhhole diameter of the grip, in millimetresFload, in newtonshthickness of the grip, in millimetresmheight of the nut, in millimetresPpitch of the thread, in millimetresswidth across flats, in millimetres4 Designation systems4.1Designation of nut stylesThis part of ISO 898 specifies requirements for three styles of nuts according to their height:—style 2: high nut with minimum height mmin 0,9D or mmin 0,9D; see Table A.1;—style 1: regular nut with minimum height mmin 0,8D; see Table A.1;—style 0: thin nut with minimum height 0,45D mmin 0,8D.4.24.2.1Designation of property classesGeneralThe marking and labelling of nuts with property classes shall be as specified in Clause 10 for only those nutswhich meet all applicable requirements of this part of ISO 898.2 ISO 2012 – All rights reserved

ISO 898-2:2012(E)4.2.2Regular nuts (style 1) and high nuts (style 2)The symbol for property classes of regular nuts (style 1) and high nuts (style 2) consists of one number. Itcorresponds to the number to the left of the appropriate maximum property class of bolts, screws and studswith which they can be mated.4.2.3Thin nuts (style 0)The symbol for property classes of thin nuts (style 0) consists of two numbers, specified in the following ways:a)the first number is zero, indicating that the loadability of the nut is reduced in comparison with the loadabilityof a regular nut or a high nut according to 4.2.2 and therefore thread stripping can occur when overloaded;b)the second number corresponds to 1/100 of the nominal stress under proof load on a hardened testmandrel, in megapascals.4.3Ranges of nominal diameters in relation to nut style and property classThe ranges of nominal diameters in relation to nut style and property class are as given in Table 1.Table 1 — Ranges of nominal diameters in relation to nut style and property classRange of nominal diameters, DProperty classRegular nut (style 1)High nut (style 2)Thin nut (style 0)04——M5 D M39M8 1 D M39 305——M5 D M39M8 1 D M39 35M5 D M39M8 1 D M39 3——6M5 D M39M8 1 D M39 3——8M5 D M39M8 1 D M39 3M5 D M39M8 1 D M39 3—9—M5 D M39—10M5 D M39M8 1 D M16 1,5M5 D M39M8 1 D M39 3—12M5 D M16M5 D M39M8 1 D M16 1,5—5 Design of bolt and nut assembliesExplanations of basic design principles of nuts and loadability of bolted assemblies are given in Annex A.Regular nuts (style 1) and high nuts (style 2) shall be mated with externally threaded fasteners according toTable 2. However, nuts of a higher property class may replace nuts of a lower property class. ISO 2012 – All rights reserved 3

ISO 898-2:2012(E)Table 2 — Combination of regular nuts (style 1) and high nuts (style 2) with bolt property classesNut property classMaximum property cla

instance in EN 10269, ASTM F2281 and in ASTM A320/A320M. This part of ISO 898 is applicable to nuts: a) made of carbon steel or alloy steel; b) with coarse thread M5 D M39, and fine pitch thread M8 1 D M39 3; c) with triangular ISO metric thread according to ISO 68-1;

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