British Standards Institution

Source:: ISO
Committee:: FME/9 - Fasteners
Categories:: Information management | Standardization. General rules | Engineering | Mechanical systems and components | Fasteners | Fasteners. General | Nuts

Scope

This International Standard specifies the characteristics of hexagon high nuts with flange (style 2) having smaller width across flats, in steel and stainless steel, with metric coarse pitch threads M5 to M16, and with product grade A.

Purpose

The nuts specified in this International Standard (small series) are designed to mate with the hexagon bolts with flange specified in ISO 4162, and enable to:

improve the manufacturability in assembly since the driving socket of the same (common) size can be used for bolt and nut, reduce the mass of nut by 30-40% compared with the current nuts with flange specified in ISO 4161, and improve the fatigue strength of bolt mated by reducing the stress concentration on the first thread root.

This kind of nuts is highly demanded in automotive industries where high volume of flanged fasteners are used.

The mechanical properties of the nuts specified in this International Standard (small series) are confirmed to be in accordance with ISO 898-2, see the document ISO/TC 2/SC 12 N 331.

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Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal

Proposal start date:

08/01/2021

Proposal end date:

10/03/2021

2. Draft

3. Public Comments

4. Comment Resolution

5. Approval

6. Publication

Learn more about the standards development process

Standards Development

ISO/NP 6738 Fasteners -- Hexagon high nuts with flange (style 2) -- Small series

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