ISO 2351-2:2002

Assembly tools for screws and nuts - Machine-operated screwdriver bits - Part 2: Screwdriver bits for cross-recessed head screws

ISO 2351-2 prescribes the technical specifications for machine-operated screwdriver bits for cross-recessed head screws. It applies to bits with male hexagon drive or with cylindrical flat end drive as defined in ISO 1173, and to tips for screwdrivers as defined in ISO 8764-1. It also gives recommended combinations between tips and bits.

Outils de manoeuvre pour vis et écrous — Embouts tournevis à machine — Partie 2: Embouts tournevis pour vis à empreinte cruciforme

L'ISO 2351-2 fixe les spécifications techniques des embouts tournevis pour vis à empreinte cruciforme. Elle s'applique aux embouts à hexagone conducteur mâle ou à queue cylindrique à méplat tels que définis dans l'ISO 1173, et pour des extrémités de tournevis telles que définies dans l'ISO 8764-1. Elle donne également les combinaisons recommandées entre les extrémités en contact avec la vis et les entraînements.

General Information

• Status: Published
• Publication Date: 07-Aug-2002
• ICS: 25.140.01 - Hand-held tools in general
• Technical Committee: ISO/TC 29/SC 10 - Assembly tools for screws and nuts, pliers and nippers
• Drafting Committee: ISO/TC 29/SC 10 - Assembly tools for screws and nuts, pliers and nippers
• Current Stage: 9093 - International Standard confirmed
• Start Date: 07-Feb-2024
• Completion Date: 13-Dec-2025

Overview

ISO 2351-2:2002 is an international standard established by the International Organization for Standardization (ISO) that specifies technical requirements for machine-operated screwdriver bits designed for cross-recessed head screws. These screws are commonly used across various industries for assembly purposes due to their reliable engagement and torque transmission capabilities.

This part of the ISO 2351 series focuses exclusively on screwdriver bits compatible with cross-recessed screw heads, including Phillips (PH) and Pozidriv (PZ) types, ensuring standardized dimensions, drive methods, and performance criteria. It applies specifically to bits with male hexagon drives or cylindrical flat end drives as defined in ISO 1173, as well as to screwdriver tips per ISO 8764-1.

By adhering to ISO 2351-2, manufacturers and users can ensure compatibility, performance, and safety in machine-operated screw fastening applications involving cross-recessed screws.

Key Topics

• Scope and Application
  ISO 2351-2 covers machine-operated screwdriver bits intended for cross-recessed head screws and defines their dimensional and mechanical specifications. The standard supports bits with male hexagon or cylindrical flat end drives that engage with assembly equipment.

• Dimensions and Combinations
  The standard details recommended combinations between screwdriver tips (PH and PZ forms) and driver ends conforming to ISO 1173, providing guidance on proper matching to optimize torque transmission and fit. This harmonization ensures reduced wear and increased tool durability.

• Technical Requirements
  All bits require comprehensive heat treatment to meet durability standards. ISO 2351-2 aligns technical characteristics of bits with those of screwdriver tips specified in ISO 8764-1, ensuring uniform quality in terms of size, shape, and hardness.

• Torque Testing
  Bits undergo torque testing following the protocols set in ISO 8764-1, confirming their ability to transmit adequate torque without failure, which is critical for assembly line performance and screw joint integrity.

• Marking and Identification
  To ensure traceability and correct usage, bits must be permanently marked with the manufacturer’s name, tip form (PH or PZ), and size designation, supporting quality control and inventory management.

Applications

• Industrial Assembly Lines
  ISO 2351-2 standardized screwdriver bits are essential for automated screwdriving equipment used in mass production and assembly processes across automotive, electronics, appliance manufacturing, and aerospace sectors.

• Maintenance and Repair Operations
  The standardized bits allow maintenance technicians to replace and interchange tools efficiently, reducing downtime and ensuring consistent screw fastening quality.

• Tool Manufacturing
  Manufacturers of machine-operated screwdriver bits utilize ISO 2351-2 to design products that meet international compatibility and quality standards, facilitating access to global markets.

• Quality Assurance
  Companies adopt ISO 2351-2 to establish procurement specifications and quality benchmarks for screwdriver bits, enhancing operational reliability and reducing the risk of screw or tool damage.

Related Standards

• ISO 1173 – Specifies dimensions and drive ends for hand- and machine-operated screwdriver bits, ensuring compatibility of the drive mechanism.

• ISO 8764-1 – Details screwdriver tips for cross-recessed head screws, establishing form and size criteria for Phillips and Pozidriv tips.

• ISO 2351-1 – Covers machine-operated screwdriver bits for slotted head screws, complementing part 2 by addressing another common screw type.

• ISO 2351-3 – Specifies screwdriver bits for hexagon socket screws, rounding out the ISO 2351 series for various screw head configurations.

• ISO 1703 – Provides nomenclature and terminology related to assembly tools for screws and nuts, supporting consistent communication in industry.

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Adopting ISO 2351-2:2002 ensures that machine-operated screwdriver bits for cross-recessed screws meet recognized international quality and dimensional standards. This facilitates efficient screwdriving operations, enhances tool durability, and optimizes assembly accuracy in industrial applications globally.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 2351-2
First edition
2002-08-01
Assembly tools for screws and nuts —
Machine-operated screwdriver bits —
Part 2:
Screwdriver bits for cross-recessed head
screws
Outils de manœuvre pour vis et écrous — Embouts tournevis à machine —
Partie 2: Embouts tournevis pour vis à empreinte cruciforme

Reference number
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ii ISO 2002 – All rights reserved

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 3.
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 part of ISO 2351 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 2351-2 was prepared by Technical Committee ISO/TC 29, Small tools, Subcommittee
SC 10, Assembly tools for screws and nuts, pliers and nippers.
ISO 2351 consists of the following parts, under the general title Assembly tools for screws and nuts — Machine-
operated screwdriver bits:
— Part 1: Screwdriver bits for slotted head screws
— Part 2: Screwdriver bits for cross-recessed head screws
— Part 3: Screwdriver bits for hexagon socket screws
©
ISO 2002 – All rights reserved iii

INTERNATIONAL STANDARD ISO 2351-2:2002(E)
Assembly tools for screws and nuts — Machine-operated
screwdriver bits —
Part 2:
Screwdriver bits for cross-recessed head screws
1 Scope
This part of ISO 2351 prescribes the technical specifications for machine-operated screwdriver bits for cross-
recessed head screws. It applies to bits with male hexagon drive or with cylindrical flat end drive as defined in
ISO 1173
...

NORME ISO
INTERNATIONALE 2351-2
Première édition
2002-08-01
Outils de manœuvre pour vis et écrous —
Embouts tournevis à machine —
Partie 2:
Embouts tournevis pour vis à empreinte
cruciforme
Assembly tools for screws and nuts — Machine-operated screwdriver bits —
Part 2: Screwdriver bits for cross-recessed head screws

Numéro de référence
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Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.ch
Imprimé en Suisse
©
ii ISO 2002 – Tous droits réservés

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 Normes internationales sont rédigées conformément aux règles données dans les Directives ISO/CEI, Partie 3.
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.
L'attention est appelée sur le fait que certains des éléments de la présente partie de l'ISO 2351 peuvent faire l'objet
de droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable de ne pas
avoir identifié de tels droits de propriété et averti de leur existence.
La Norme internationale ISO 2351-2 a été élaborée par le comité technique ISO/TC 29, Petit outillage, sous-comité
SC 10, Outils de manoeuvre pour vis et écrous, pinces et tenailles.
L'ISO 2351 comprend les parties suivantes, présentées sous le titre général Outils de manoeuvre pour vis et
écrous — Embouts tournevis à machine:
— Partie 1: Embouts tournevis pour vis à tête fendue
— Partie 2: Embouts tournevis pour vis à empreinte cruciforme
— Partie 3: Embouts tournevis pour vis à six pans creux
©
ISO 2002 – Tous droits réservés iii

NORME INTERNATIONALE ISO 2351-2:2002(F)
Outils de manœuvre pour vis et écrous — Embouts tournevis à
machine —
Partie 2:
Embouts tournevis pour vis à empreinte cruciforme
1 Domaine d'application
La présente partie de l'ISO 2351 fixe les spécifications techniques des embouts tournevis pour vis à empreinte
cruciforme. Elle s'applique aux embouts à hexagone conducteur mâle ou à queue cylindriq
...