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Gunjan Shukla
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ISO 898-2:2022 PDF Free Download - Fasteners with Specified Property Classes


ISO 898-2: A Guide to Nuts with Specified Property Classes




Nuts are essential components of fasteners that are used to join or secure two or more parts together. They are usually paired with bolts, screws or studs that have matching threads. Nuts come in various shapes, sizes, materials and grades, depending on the application and the required performance. One of the most widely used standards for nuts is ISO 898-2, which specifies the mechanical and physical properties of nuts made of carbon steel and alloy steel. In this article, we will explain what ISO 898-2 is, how to identify and designate ISO 898-2 nuts, how to use them in bolt and nut assemblies, and how to find and download ISO 898-2 PDF for free.


What is ISO 898-2?




ISO 898-2 is a specification that defines the mechanical and physical properties of nuts made of carbon steel and alloy steel. It applies to nuts with coarse thread and fine pitch thread in certain diameter/pitch combinations. The nuts are tested and used at an ambient temperature range of 10 C to 35 C. The latest version of ISO 898-2 is ISO 898-2:2022.




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Scope and application of ISO 898-2




This standard applies to nuts:


  • with ISO metric thread (see ISO 68-1),



  • with diameter/pitch combinations according to ISO 261 and ISO 262,



  • with coarse pitch thread M5 to M39, and fine pitch thread M81 to M393,



  • with thread tolerances according to ISO 965-1, ISO 965-2 or ISO 965-5,



  • with specified property classes 04, 05, 5, 6, 8, 10 and 12 including proof load,



  • of three different nut styles (see below): regular nuts (style 1), high nuts (style 2) and thin nuts (style 0),



  • with a minimum outside diameter or width across flats s 1,45 D,



  • able to mate with bolts, screws and studs with property classes in accordance with ISO 898-1 (see Annex B),



  • intended to be used in applications ranging from 50 C to +150 C, or up to +300 C.



WARNING Nuts conforming to the requirements of this document are tested at the ambient temperature range of 10 C to 35 C and are used in applications ranging from 50 C to +150 C; however, these nuts are also used outside this range and up to +300 C for specific applications. It is possible that they do not retain the specified mechanical and physical properties at lower and/or elevated temperatures. Therefore, it is the responsibility of the user to determine the appropriate choices based on the service environment conditions of the assembly (see also below).


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Benefits and advantages of ISO 898-2




Some of the benefits and advantages of using nuts that conform to ISO 898-2 are:


  • They have consistent and reliable mechanical and physical properties that ensure their performance under various loads and conditions.



  • They have standardized dimensions, tolerances and markings that facilitate their identification, selection, installation and inspection.



  • They have compatibility with other fasteners that follow the same or similar standards, such as bolts, screws and studs that comply with ISO 898-1.



  • They have a wide range of applications in various industries, such as construction, engineering, automotive, aerospace, etc.



How to identify and designate ISO 898-2 nuts




In order to identify and designate nuts that conform to ISO 898-2, you need to know the following information:


Nut styles and property classes




ISO 898-2 specifies three different nut styles, which are distinguished by their height (or thickness) relative to their nominal diameter D. The nut styles are:


  • Style 0: thin nuts with a height m 0,8 D,



  • Style 1: regular nuts with a height m 0,8 D but 1,5 D,



  • Style 2: high nuts with a height m 1,5 D.



The nut style is indicated by a number after the property class. For example, a style 1 nut has the number 1 after the property class.


ISO 898-2 also specifies seven different property classes for nuts, which are based on their mechanical and physical properties, such as proof load, hardness and tensile strength. The property classes are:


  • Class 04: low carbon steel nuts with a minimum proof load of 40 MPa,



  • Class 05: low carbon steel nuts with a minimum proof load of 50 MPa,



  • Class 5: medium carbon steel nuts with a minimum proof load of 500 MPa,



  • Class 6: medium carbon steel nuts with a minimum proof load of 600 MPa,



  • Class 8: quenched and tempered alloy steel nuts with a minimum proof load of 800 MPa,



  • Class 10: quenched and tempered alloy steel nuts with a minimum proof load of 1000 MPa,



  • Class 12: quenched and tempered alloy steel nuts with a minimum proof load of 1200 MPa.



The property class is indicated by two digits before the nut style. For example, a class 8 nut has the number 8 before the nut style.


Diameter, pitch and thread tolerances




The diameter and pitch of the nut thread are indicated by the nominal diameter D and the pitch P of the corresponding bolt or screw. The diameter/pitch combinations are according to ISO 261 and ISO 262. For example, a nut with a nominal diameter of M10 and a coarse pitch of P = 1.5 mm has the designation M101.5.


The thread tolerances of the nut are according to ISO 965-1, ISO 965-2 or ISO 965-5, depending on the diameter and pitch of the nut. The thread tolerances are indicated by a letter after the diameter and pitch. For example, a nut with a 6H thread tolerance has the letter H after the diameter and pitch.


Marking and labelling of nuts




ISO 898-2 requires that nuts are marked or labelled with the following information:


  • The manufacturer's identification symbol,



  • The property class and the nut style,



  • The nominal diameter and the pitch of the thread,



  • The thread tolerance (if not 6H),



  • Any additional symbols or codes that indicate special characteristics or requirements.



The marking or labelling of nuts can be done by any permanent method, such as stamping, embossing, etching, etc. The marking or labelling should be legible, durable and visible on the nut. The marking or labelling should not impair the function or performance of the nut. The marking or labelling should be done on the bearing surface or on the side of the nut, unless otherwise specified by the manufacturer or the customer.


How to use ISO 898-2 nuts in bolt and nut assemblies




ISO 898-2 nuts are designed to be used in bolt and nut assemblies with bolts, screws or studs that have matching threads and property classes. The bolt and nut assemblies should comply with ISO 898-1, which specifies the mechanical and physical properties of bolts, screws and studs made of carbon steel and alloy steel. The following information is important for using ISO 898-2 nuts in bolt and nut assemblies:


Material, heat treatment and chemical composition




The material, heat treatment and chemical composition of ISO 898-2 nuts are specified in Annex A of the standard. The material, heat treatment and chemical composition of ISO 898-1 bolts, screws and studs are specified in Annex A of that standard. The material, heat treatment and chemical composition of both nuts and bolts should be compatible and suitable for the intended application. The material, heat treatment and chemical composition of both nuts and bolts should also be compatible with the service environment conditions of the assembly, such as temperature, corrosion, wear, etc.


Mechanical and physical properties




The mechanical and physical properties of ISO 898-2 nuts are specified in Tables 1 to 7 of the standard. The mechanical and physical properties of ISO 898-1 bolts, screws and studs are specified in Tables 1 to 7 of that standard. The mechanical and physical properties of both nuts and bolts should be consistent and reliable for the intended application. The mechanical and physical properties of both nuts and bolts should also be suitable for the service environment conditions of the assembly, such as load, stress, vibration, etc.


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