BS EN ISO 898-2:2012

Foreword
1 Scope
2 Normative references
3 Symbols
4 Designation systems
5 Design of bolt and nut assemblies
6 Materials
7 Mechanical properties
8 Inspection
9 Test methods
10 Marking
Annex A (informative) - Design principles of nuts
Annex B (informative) - Thread dimensions for the
        test mandrel
Bibliography

Defines mechanical and physical properties of nuts with coarse thread and fine pitch thread made of carbon steel and alloy steel when tested at an ambient temperature range of 10 degrees C to 35 degrees C.

This part of ISO898 specifies mechanical and physical properties of nuts with coarse thread and fine pitch thread 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 ISO898 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 lower temperatures. NOTE1 Nuts conforming to the requirements of this part of ISO898 have been used in applications ranging from –50°C to+150°C. It is the responsibility of users to consult an experienced fastener materials expert for temperatures outside the range of –50°C to+150°C and up to a maximum temperature of+300°C to determine appropriate choices for a given application. NOTE2 Information for the selection and application of steels for use at lower and elevated temperatures is given for instance in EN10269, ASTM F2281 and in ASTM A320/A320M. This part of ISO898 is applicable to nuts: made of carbon steel or alloy steel; with coarse thread M5≤D≤M39, and fine pitch thread M8×1≤D≤M39×3; with triangular ISO metric thread according to ISO68-1; with diameter/pitch combinations according to ISO261 and ISO262; with specified property classes, including proof load; with different nut styles: thin nuts, regular nuts and high nuts; with minimum height m≥0,45D; with a minimum outside diameter or width across flats s≥1,45D (see AnnexA); able to mate with bolts, screws and studs with property classes according to ISO898-1. For hot dip galvanized nuts, see ISO10684. This part of ISO898 does not specify requirements for properties such as: prevailing torque properties (see ISO2320); torque/clamp force properties (see ISO16047 for test method); weldability; corrosion resistance.