Description of 21/30401615 DC 2021

This document specifies the mechanical and physical properties of nuts made of non-alloy steel or alloy steel, for three different nut styles in accordance with 5.1:

• regular nuts (style 1),

• high nuts (style 2),

• thin nuts (style 0),

in combination with:

• coarse pitch thread M5 ≤ D ≤ M39, and fine pitch thread 8 mm ≤ D ≤ 39 mm,

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

and able to be mated with bolts, screws and studs with property classes in accordance with ISO 898-1 .

These combinations are based on bolt/nut compatibility, manufacturing processes and market needs. If other combinations are needed, e.g. for nuts designed for particular applications, see ISO/TR 16224 .

Nuts 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.

This document applies to the nuts specified above, with:

• triangular ISO metric thread in accordance with ISO 68-1 ,

• diameter/pitch combinations in accordance with ISO 261 and ISO 262 ,

• thread tolerances in accordance with ISO 965-1 , ISO 965-2 or ISO 965-5 , and

• minimum outside diameter or width across flats s ≥ 1,45D (see Annex B).

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

This document does not specify requirements for functional properties such as:

• prevailing torque properties (see ISO 2320 ),

• torque/clamp force properties (see ISO 16047 for test method),

• weldability, or

• corrosion resistance.

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