ISO 17754:2014

Timber structures - Test methods - Torsional resistance of driving in screws

ISO 17754:2014 specifies a test method to determine the torsional resistance to driving of screws in solid timber or glued laminated timber or other wood-based materials. The method is used primarily to ensure the torque that may be applied to install screws will be less than the specified failure torque of the screw.

Structures en bois — Méthodes d'essai — Résistance à la torsion des vis lors du vissage

General Information

• Status: Published
• Publication Date: 04-May-2014
• ICS: 91.080.20 - Timber structures
• Technical Committee: ISO/TC 165 - Timber structures
• Drafting Committee: ISO/TC 165/WG 7 - Connections and assemblies
• Current Stage: 9093 - International Standard confirmed
• Start Date: 11-Apr-2025
• Completion Date: 13-Dec-2025

Relations

• Consolidated By: ISO 17633:2017 - Welding consumables - Tubular cored electrodes and rods for gas shielded and non-gas shielded metal arc welding of stainless and heat-resisting steels - Classification
• Effective Date: 06-Jun-2022

Overview

ISO 17754:2014 is an international standard specifying test methods for assessing the torsional resistance of driving in screws used in timber structures. This standard focuses on determining the torque required to install screws into solid timber, glued laminated timber, or other wood-based materials. By defining a reliable test method, ISO 17754:2014 ensures that the applied torque during screw installation remains below the failure torque of the screw, enhancing structural safety and performance.

The standard applies primarily to construction and woodworking industries where timber fasteners play a crucial role in load-bearing and structural integrity. It is essential for manufacturers, engineers, and quality control professionals engaged in timber structures testing and certification.

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Key Topics

• Scope and Purpose
  Defines a standardized method to measure the torsional resistance-torque-required to drive screws into various timber materials, ensuring screws do not fail during installation.

• Material Specifications
  Covers requirements for screws and timber or wood-based materials, including:

  • Screw type and dimensions (per EN 14592 and manufacturer specs)
  • Timber species, density, moisture content (per ISO 3130 and ISO 3131)
  • Test piece dimensions and conditioning for consistent results

• Test Setup and Procedure
  Outlines precise conditions for testing including:

  • Mounting test pieces securely to prevent movement
  • Use of a calibrated moment cell with at least 1% accuracy to measure torque
  • Mechanical or manual screw insertion with speeds ≤ 100 RPM
  • Monitoring vertical displacement during screw installation

• Test Results and Reporting
  Specifies documentation details such as:

  • Maximum screw insertion moment before screw head contact
  • Material and environmental conditions during testing
  • Screw positioning and any pre-drilling or countersink information
  • Comprehensive test data and plots illustrating torque vs. penetration depth

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Applications

ISO 17754:2014 provides practical guidance for:

• Quality Assurance in Timber Fasteners
  Verifying product performance by confirming the torsional resistance matches design requirements.

• Structural Timber Engineering
  Assisting engineers in selecting appropriate screws for load-bearing applications, preventing screw failure due to excessive torque.

• Wood Product Manufacturing
  Guiding manufacturers in process control and screw design validation to comply with safety standards.

• Test Laboratories and Certification Bodies
  Offering a methodologically sound, reproducible test to evaluate screw installation torque in timber materials for certification and compliance.

• Research and Development
  Facilitating comparative studies on new screw types, materials, and timber treatments concerning their installation torque characteristics.

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Related Standards

• EN 14592 - Timber Structures - Dowel Type Fasteners - Requirements
  Specifies requirements and characteristics for screws commonly tested under ISO 17754.

• EN 15737:2007 - Timber Structures - Test Methods - Torsional Resistance of Driving in Screws
  European standard closely aligned with ISO 17754, providing additional context and methodological comparison.

• ISO 3130 - Wood - Determination of Moisture Content for Physical and Mechanical Tests
  Essential for determining timber moisture content prior to screw insertion testing.

• ISO 3131 - Wood - Determination of Density for Physical and Mechanical Tests
  Provides density measurement guidelines critical for defining test piece requirements.

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By adhering to ISO 17754:2014, industries ensure the safe and effective use of screws in timber construction, minimizing mechanical failures and promoting consistent product quality. This standard supports sustainable forestry products by enabling reliable timber fastening solutions that meet global performance expectations.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 17754
First edition
2014-05-01
Timber structures — Test methods
— Torsional resistance of driving in
screws
Structures en bois — Méthodes d’essai — Résistance à la torsion des
vis lors du vissage
Reference number
©
ISO 2014
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
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Published in Switzerland
ii © ISO 2014 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Material requirements . 1
5.1 Description . 1
6 Test methods . 2
6.1 General . 2
6.2 Conditioning . 2
6.3 Sampling . 2
6.4 Test piece dimensions . 2
7 Test . 3
7.1 Test setup . 3
7.2 Procedure . 3
7.3 Results . 4
8 Test report . 4
8.1 Test piece . 4
8.2 Test method . 5
8.3 Test results. 5
Bibliography . 6
Foreword
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The committee responsible for this document is ISO/TC 165, Structural Timber.
iv © ISO 2014 – All rights reserved

INTERNATIONAL STANDARD ISO 17754:2014(E)
Timber structures — Test methods — Torsional resistance
of driving in screws
1 Scope
This I
...