ISO/NP 898-11

Fasteners — Mechanical properties of fasteners made of carbon steel and alloy steel — Part 11: Bolts, screws and studs with diameters above 39 mm and up to 100 mm and specified property classes

Scope

This document specifies the mechanical and physical properties of bolts, screws and studs with nominal diameters above 39 mm and up to 100 mm, made of alloy steel. Fasteners (the term used when bolts, screws and studs are considered all together) conforming to the requirements of this document are tested at the ambient temperature range of 10°C to 35°C. It is possible that they do not retain the specified mechanical and physical properties at elevated and/or lower temperatures.

WARNING Fasteners conforming to the requirements of this document are used in applications ranging from -50°C to +150°C, however these fasteners are also used outside this range and up to +300°C. It is the responsibility of the user to determine the appropriate choice for its specific applications, and consulting an experienced fastener material expert is recommended outside the range of -50°C to +150°C (several factors need to be taken into account, e.g. steel composition, duration of exposure at elevated or lower temperature, the effect of the temperature on the fastener mechanical properties and clamped parts).

NOTE Information for the selection and application of steels for use at lower and elevated temperatures is given for example in EN 10269, ASTM F2281 and ASTM A320/A320M.

This document applies to bolts, screws and studs with full loadability and with:
— triangular ISO metric thread in accordance with ISO 68-1,
— diameter/pitch combinations in accordance with ISO 261,
— coarse pitch thread for M42 to M68,
— fine pitch thread for M42x3 to M100x6,
— thread tolerances in accordance with ISO 965-1, -2 or -4.

For hot dip galvanized fasteners, additional requirements are specified in ISO 10684.

This document does not specify requirements for functional properties such as:
— torque/clamp force properties (see ISO 16047 for test method),
— resistance to shear stress,
— corrosion resistance (see e.g. ISO 4042, ISO 10683 and ISO 10684),
— fatigue resistance, or
— weldability.