ISO 12125:2012

INTERNATIONAL ISO
STANDARD 12125
Second edition
2012-09-01
Prevailing torque type hexagon nuts
with flange (with non-metallic insert)
with metric fine pitch thread, style 2 —
Product grades A and B
Écrous hexagonaux à embase, autofreinés (à anneau non métallique),
à filetage métrique à pas fin, style 2 — Grades A et B
Reference number
ISO 12125:2012(E)
©
ISO 2012

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ISO 12125:2012(E)
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ii © ISO 2012 – All rights reserved

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ISO 12125:2012(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Dimensions . 1
4 Requirements and reference International Standards . 4
5 Designation . 4
Annex A (informative) Gauging of hexagon nuts with flange . 5
© ISO 2012 – All rights reserved iii

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ISO 12125:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 12125 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners with
metric internal thread.
This second edition cancels and replaces the first edition (ISO 12125:1997), of which it constitutes a minor revision.
iv © ISO 2012 – All rights reserved

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INTERNATIONAL STANDARD ISO 12125:2012(E)
Prevailing torque type hexagon nuts with flange (with non-
metallic insert) with metric fine pitch thread, style 2 — Product
grades A and B
1 Scope
This International Standard specifies the characteristics of prevailing torque type all metal hexagon nuts with
flange (with non-metallic insert) of style 2, with metric fine pitch thread with nominal thread diameters, D,
from 8 mm up to and including 20 mm, in product grade A for sizes D ≤ 16 mm and product grade B for sizes
D > 16 mm, and with property classes 6, 8 and 10.
NOTE The dimensions of the nuts correspond to those given in ISO 10663 plus prevailing torque feature.
If other specifications are required, they can be selected from existing International Standards, for example
ISO 261, ISO 724, ISO 898-2, ISO 965-2, ISO 2320 and ISO 4759-1.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 225, Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions
ISO 261, ISO general purpose metric screw threads — General plan
ISO 724, ISO general-purpose metric screw threads — Basic dimensions
ISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2: Nuts with
specified property classes – Coarse thread and fine pitch thread
ISO 965-2
...