ISO 8733:1997

Parallel pins with internal thread, of unhardened steel and austenitic stainless steel

Goupilles cylindriques à trou taraudé en acier non trempé et en acier inoxydable austénitique

La présente Norme internationale prescrit les caractéristiques des goupilles cylindriques à trou taraudé en acier non trempé et en acier inoxydable austénitique de diamètre nominal, d1, de 6 mm à 50 mm inclus.

General Information

• Status: Published
• Publication Date: 12-Nov-1997
• ICS: 21.060.50 - Pins, nails
• Technical Committee: ISO/TC 2 - Fasteners
• Drafting Committee: ISO/TC 2/WG 13 - Washer and non-threaded fasteners
• Current Stage: 9093 - International Standard confirmed
• Start Date: 19-Jun-2023
• Completion Date: 13-Dec-2025

Relations

• Consolidates: ISO 3159:1976 - Timekeeping instruments - Wrist-chronometers with spring balance oscillator
• Effective Date: 06-Jun-2022
• Revises: ISO 8733:1986 - Parallel pins with internal thread, unhardened
• Effective Date: 15-Apr-2008

Overview

ISO 8733:1997 is an international standard published by the International Organization for Standardization (ISO) that specifies the requirements for parallel pins with internal threads made from unhardened steel and austenitic stainless steel. These cylindrical pins play a crucial role as fastening elements in mechanical engineering and manufacturing, offering reliable alignment and secure assembly in a wide range of industrial applications.

The standard defines the characteristics, dimensions, mechanical properties, and quality requirements to ensure consistency, interchangeability, and optimal performance. It applies to parallel pins with nominal diameters ranging from 6 mm to 50 mm, covering common sizes used in industry.

Key Topics

• Material Specifications
  The pins are made from two primary materials:

  • Unhardened (soft) steel
  • Austenitic stainless steel, conforming to ISO 3506-1 for corrosion resistance and mechanical characteristics

• Dimensional Requirements
  Detailed dimensional data is provided, including:

  • Nominal diameters (6 mm to 50 mm)
  • Length ranges, with common increments from 16 mm up to 200 mm and beyond
  • Thread specifications based on ISO 965-2 metric general-purpose tolerances (tolerance 6H)
  • Thread pitch and depth for internal threading

• Surface Finish and Treatment
  The pins can feature different surface treatments depending on the material and application, such as:

  • Black oxidation
  • Phosphating layers
  • Zinc coatings with chromate conversion layers (ISO 4042 and ISO 9717 compliant)
    Surface roughness is maintained below 0.8 µm to ensure smooth operation.

• Quality and Inspection
  Pins must be free from burrs and detrimental irregularities, with quality control procedures aligned with ISO 3269 acceptance criteria to guarantee product integrity and performance.

• Designation Format
  Standardized designation format aids in clear communication:
  Example - "Cylindrical pin ISO 8733 - 6 · 30 - St" (soft steel, 6 mm diameter, 30 mm length)
  Example - "Cylindrical pin ISO 8733 - 6 · 30 - A1" (austenitic stainless steel, same size)

Applications

ISO 8733 parallel pins with internal threads are widely used across industries where precision alignment and secure fastening are mandatory. Typical practical applications include:

• Mechanical assemblies requiring accurate positioning of components
• Tooling and die construction
• Automotive and aerospace manufacturing for joining parts
• Machinery and equipment engineering where corrosion resistance and mechanical reliability are crucial
• Industrial automation systems where repeatability and part interchangeability are essential

These pins enable engineers to design robust mechanical joints that withstand dynamic stresses and environmental exposure, contributing to overall product safety and durability.

Related Standards

To fully comply and integrate ISO 8733 pins into engineering projects, the following standards are relevant:

• ISO 965-2 - Metric screw thread tolerances for general use, defining the allowable thread limits and pitches
• ISO 3506-1 - Stainless steel fasteners mechanical properties and corrosion resistance
• ISO 3269 - Acceptance inspection procedures for fasteners
• ISO 4042 - Electrolytic coatings for fasteners, detailing surface finish standards
• ISO 9717 - Specifications for phosphate conversion coatings on metals

These complementary standards provide guidelines for mechanical properties, surface treatments, inspection protocols, and thread dimensional tolerances, ensuring that the pins conform to international best practices in fastener technology.

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Keywords: ISO 8733, parallel pins, internal thread, unhardened steel, austenitic stainless steel, cylindrical pins, fasteners standard, mechanical fastener, pin dimensions, thread pitch, corrosion resistance, industrial fasteners, ISO standards.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 8733
Second edition
1997-11-15
Parallel pins with internal thread,
of unhardened steel and austenitic
stainless steel
Goupilles cylindriques à trou taraudé en acier non trempé et
en acier inoxydable austénitique
A
Reference number
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.
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.
International Standard ISO 8733 was prepared by Technical Committee
ISO/TC 2, Fasteners.
This second edition cancels and replaces the first edition (ISO 8733:1986),
which has been technically revised.
©  ISO 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii
©
INTERNATIONAL STANDARD  ISO ISO 8733:1997(E)
Parallel pins with internal thread of unhardened steel
and austenitic stainless steel
1 Scope
This International Standard specifies the characteristics of parallel pins with internal thread of unhardened
steel and austenitic stainless steel with nominal diameters d from 6 mm to 50 mm inclusive.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject
to revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO
maintain registers of currently valid International Standards.
1)
ISO 965-2:– , ISO general purpose metric screw threads – Tolerances – Part 2: Limits of sizes for general
purpose bolt and nut thread – Medium quality.
ISO 3269:1988, Fasteners – Acceptance inspection.
ISO 3506-1:1997, Corrosion-resistant stainless steel fasteners – Part 1: Bolts, screws and studs.
2)
ISO 4042: – , Fasteners – Electroplated coatings.
ISO 9717:1990, Phosphate conversion coatings for metals – Method of specifying requirements.
3 Dimensions
See fi
...

NORME ISO
INTERNATIONALE 8733
Deuxième édition
1997-11-15
Goupilles cylindriques à trou taraudé en
acier non trempé et en acier inoxydable
austénitique
Parallel pins with internal thread, of unhardened steel and austenitic
stainless steel
.
A
Numéro de référence
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération
mondiale d'organismes nationaux de normalisation (comités membres de
l'ISO). L'élaboration des Normes internationales est en général confiée aux
comités techniques de l'ISO. Chaque comité membre intéressé par une
étude a le droit de faire partie du comité technique créé à cet effet. Les
organisations internationales, gouvernementales et non gouvernementales,
en liaison avec l'ISO participent également aux travaux. L'ISO collabore
étroitement avec la Commission électrotechnique internationale (CEI) en
ce qui concerne la normalisation électrotechnique.
Les projets de Normes internationales adoptés par les comités techniques
sont soumis aux comités membres pour vote. Leur publication comme
Normes internationales requiert l'approbation de 75 % au moins des
comités membres votants.
La Norme internationale ISO 8733 a été élaborée par le comité technique
ISO/TC 2, Éléments de fixation.
Cette deuxième édition annule et remplace la première édition
(ISO 8733:1986), dont elle constitue une révision technique.
©  ISO 1997
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publi-
cation ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun pro-
cédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord
écrit de l'éditeur.
Organisation internationale de normalisation
Case postale 56 • CH-1211 Genève 20 • Suisse
Internet [e-mail]
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Imprimé en Suisse
ii
©
NORME INTERNATIONALE  ISO ISO 8733:1997(F)
Goupilles cylindriques à trou taraudé en acier non
trempé et en acier inoxydable austénitique
1 Domaine d'application
La présente Norme internationale prescrit les caractéristiques des goupilles cylindriques à trou
taraudé en acier non trempé et en acier inoxydable austénitique de diamètre nominal, d ,
de 6 mm à 50 mm inclus.
2 Références normatives
Les normes suivantes contiennent des dispositions qui, par suite de la référence qui en est faite,
constituent des dispositions valables pour la présente Norme internationale. Au moment de la
publication, les éditions indiquées étaient en vigueur. Toute norme est sujette à révision et les
parties prenantes des accords fondés sur la présente Norme internationale sont invitées à
rechercher la possibilité d'appliquer les éditions les plus récentes des normes indiquées ci-après.
Les membres de la CEI et de l'ISO possèdent le registre des Normes internationales en vigueur à
un moment donné.
1)
ISO 965-2:— , Filetages métriques ISO pour usages généraux — Tolérances — Partie 2:
Dimensions limites pour la boulonnerie d'usage courant — Qualité moyenne.
ISO 3269:1988, Éléments de fixation — Contrôle de réception.
ISO 3506-1:1997, Caractéristiques mécaniques des éléments de fixation en acier inoxydable
résistant à la corrosion — Partie 1: Vis et goujons.
2)
ISO 4042: — , Éléments de fixation — Revêtements électrolytiques.
ISO 9717:1990, Couches de conversion au phosphate sur métaux — Méthode de spécification
des caractéristiques.
____________
1)  À publier. (Révision de l'ISO 965-2:1980)
2)
...