ISO/PRF 8742

ISO /TC 2
Secretariat: DIN
Date: 2026-01-19xx
Fasteners — Grooved pins — One-third-length centrecenter grooves
Fixations — Goupilles cannelées — Cannelures centrales sur le tiers de la longueur
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Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles of grooved pins and assembly . 1
5 Dimensions . 2
6 Requirements and reference International Standards . 8
7 Labelling on package . 8
8 Designation . 9
Bibliography . 10

iii
Foreword
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This document was prepared by Technical Committee ISO/TC 2, Fasteners, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 185 Fasteners, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 8742:1997) which has been technically
revised.
The main changes are as follows:
— — terms and definitions, principles for grooved pins and assembly (including hole dimensions), control
of the expanded diameter d and pin straightness, mechanical and physical properties (including shear
resistance and hardness) and inspection which are common for all grooved pins (product standards ISO
8739 to ISO 8747, ISO 13670 and ISO 13672) have been specified in the new reference standard ISO 13669,
general requirements;
— — non-preferred diameters 1 mm, 3,5 mm, 7 mm, 9 mm, 14 mm and 18 mm have been added;
— — values of expanded diameter d for steel pins have been slightly increased for the shortest length
range, and have been added for stainless steel pins;
— — tolerances for the rounded end and values for the chamfered end have been added;
— — tolerances for the length of the grooves and their location have been added;
— — stainless steel grades A2, A4, C1 and F1 have been added;
— — other materials (such as hardened steels, brass, aluminium) are by agreement (see Table 3Table 3););
iv
— — specifications for labelling have been added as Clause 8Clause 8.
Any feedback or questions on this document should be directed to the user's national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
Fasteners — Grooved pins — One-third-length centrecenter grooves
1 Scope
This document specifies the characteristics of grooved pins with one-third-length centre oval grooves (with
closed ends), in steel and stainless steel, and with a nominal diameter from 1 mm to 25 mm.
These grooved pins are designed to fulfil the main following functions:
— — relative rotation of the assembled parts, and
— — positioning or guiding,
with an easy installation (due to its symmetrical shape) and a medium level of pull-out resistance (due to the
elastic fit behaviour of the pin).
The general requirements (including functional principles for grooved pins and assembly) are specified in
ISO 13669.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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 1891--4, Fasteners — Vocabulary — Part 4: Control, inspection, delivery, acceptance and quality
ISO 3269, Fasteners — Acceptance inspection
ISO 3506--6, Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 6: General
rules for the selection of stainless steels and nickel alloys for fasteners
ISO 4042, Fasteners — Electroplated coating systems
ISO 9717, Metallic and other inorganic coatings — Phosphate conversion coating of metals
ISO 10683, Fasteners — Non-electrolytically applied zinc flake coating systems
ISO 13669, Fasteners — Grooved pins — General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13669 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
4 Principles of grooved pins and assembly
The principles of grooved pins and assembly specified in ISO 13669 shall apply.
5 Dimensions
Dimensions shall be in accordance with Figure 1Figure 1 and with Tables 1Tables 1 and 22. The control of the
expanded diameter, d , and pin straightness, t, shall be as specified in ISO 13669.
For coated pins, dimensions and tolerances shall apply prior to coating.
Unless o
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