ISO 737:1975

Coniferous sawn timber - Sizes - Methods of measurement

Reviewed ISO Recommendation R 737. Covers unplaned square-edged und unedged sawn timber and defines how to measure thickness, width, length and volume. Terms and definitions are given in ISO 1032.

Sciages de bois résineux — Dimensions — Méthodes de mesurage

General Information

• Status: Published
• Publication Date: 31-Mar-1975
• ICS: 79.040 - Wood, sawlogs and sawn timber
• Technical Committee: ISO/TC 218 - Timber
• Drafting Committee: ISO/TC 218/WG 3 - Sawn and processed timber
• Current Stage: 9093 - International Standard confirmed
• Start Date: 17-Jan-2024
• Completion Date: 13-Dec-2025

Overview

ISO 737:1975 is an international standard issued by the International Organization for Standardization (ISO) that specifies the sizes and methods of measurement for coniferous sawn timber. This standard focuses on unplaned, square-edged, and unedged softwood timber, defining precise procedures for measuring timber thickness, width, length, and volume. The terms and definitions referenced in ISO 737 align with those provided in ISO 1032, ensuring consistency across timber-related standards.

Originally published as an ISO Recommendation (ISO R 737) prior to 1972, this document was reviewed and transformed into the current International Standard to maintain technical accuracy and global applicability. ISO 737 is essential for manufacturers, traders, and quality inspectors within the wood and construction industries dealing with coniferous sawn timber.

Key Topics

• Scope
  ISO 737 applies exclusively to coniferous sawn timber that is unplaned, either square-edged or unedged, with a thickness of 40 mm or greater. Timber pieces thinner than 40 mm are measured differently for certain dimensions.

• Measurement Methods
  The standard outlines specific methods for measuring timber dimensions:

  • Length: Measured as the minimum distance between the two ends, perpendicular to the longitudinal axis.
  • Width: Depends on the timber type:
    • For square-edged timber with parallel edges, measured at any point without wane (defects like bark or missing wood) and at least 150 mm from the ends.
    • For tapered edges, measured at the midpoint of the face length where no wane is present.
    • For unedged timber thicker than 40 mm, the width reflects the average of both faces; below 40 mm thickness, it’s measured on the narrow face.
      Dimensions are rounded to the nearest multiple of 10 mm, following defined rounding rules.

• Thickness Measurement
  Thickness is measured at any point along the timber, avoiding areas closer than 150 mm from the ends to ensure consistency.

• Volume Calculation
  The volume of each piece is the product of its nominal thickness, width, and length, all expressed in uniform units. Volumes of timber lots are rounded to the nearest 0.001 cubic meters.

Applications

ISO 737:1975 is highly relevant to various sectors that handle coniferous sawn timber, including:

• Wood processing and manufacturing: Ensures uniform measurement rules for production sizing and quality control.
• Construction and structural use: Facilitates precise determination of timber volume and size, critical for structural integrity and resource estimation.
• Timber trading and logistics: Enables consistent measurement for sales, inventory, and transport calculation, improving transparency and fairness.
• Forestry and resource management: Assists in standardizing measurements for inventory assessment of harvested coniferous wood.

By adopting ISO 737, stakeholders can reduce disputes over timber dimensions and volumes, enhance communication, and streamline processing workflows.

Related Standards

ISO 737 references or complements other international standards to create a comprehensive framework around timber sizing and terminology:

• ISO 1032: Provides essential terms and definitions related to timber products, ensuring consistent interpretation of measurement parameters.
• Other ISO standards addressing wood-based materials, structural timber specifications, and testing methods contribute to a holistic approach in timber standardization.
• National and regional standards often align with or adopt ISO 737 to maintain international consistency in timber trade and quality.

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Keywords: ISO 737, coniferous sawn timber, timber sizes, timber measurement methods, wood volume calculation, square-edged timber, unedged timber, timber thickness, timber width, timber length, softwood timber standards.

Standards Content (Sample)

INTERNATIONAL STANDARD
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .ME ’HCflYHAPOAHAR OPT.4HM3ALIMR I-IO CTAHAAPTM3AUMM=ORGANISATION INTERNATIONALE DE NORMALISATION
Coniferous sawn timber - Sizes - Methods of measurement
Sciages de bois rksineux - Dimensions - Mkthodes de mesurage
First edition - 1975-04-01
UDC 674.032-41 : 531.7 Ref. No. ISO 737-1975 (E)
Descriptors : wood, structural timber, soft woods, coniferous timber, sawn timber, measurement, dimensions, length, width, thickness.
Price based on 1 page
FOREWORD ’
ISO (the International Organization for Standardization) is a worldwide federation
of national Standards institutes (ISO Member Bodies). The work of developing
International Standards is carried out through ISO Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up 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.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the ISO Council.
Prior to 1972, the results of the work of the Technical Committees were published
as ISO Recommendations; these documents are now in the process of being
transformed into International Standards. As part of this process, Technical
Committee ISO/TC 55 has reviewed ISO Recommendation R 737 and found it
technically suitable for transformation. International Standard ISO 737 therefore
replaces ISO Recommendation R 737-1968 to which it is technically identical.
ISO Recommendation R 737 was approved by the Member Bodies of the following
countries :
Australia Hungary Portugal
Belgium India Romania
Canada Ireland South Africa, Rep. of
Czechoslovakia Israel Spain
Denmark Italy Sw eden
Egypt, Arab Rep. of Japan Turkey
Finland Netherlands United Kingdom
New Zealand U.S.S. R.
France
Germany Poland Yugoslavia
The Member Body of the following country expressed disapproval of the
Recommendation on technical grounds :
Austria
The Member Body of the following
...

NORME INTERNATIONALE 737
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEXfiYHAPOAHAII OPTAHM3AUMfl HO CTAHAAPTki3ALViW~ORGANISATION INTERNATIONALE DE NORMALISATION
Sciages de bois résineux - Dimensions - Méthodes de
mesurage
Coniferous sawn timber - Sizes - Methods of measurement
Première édition - 1975-04-01
Réf. No: ISO 737-1975 (F)
CDU 674.032-41 : 531.7
Descripteurs : bois, bois de construction, bois tendre, bois résineux, bois scié, mesurage, dimension, longueur, largeur, épaisseur.
Prix basé sur 1 page
AVANT-PROPOS
L’ISO (Organisation Internationale de Normalisation) est une fédération mondiale
d’organismes nationaux de normalisation (Comités Membres KO). L’élaboration de
Normes Internationales est confiée aux Comités Techniques ISO. Chaque Comité
Membre intéressé par une étude a le droit de faire partie du Comité Technique
correspondant.
Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent également aux travaux.
Les Projets de Normes Internationales adoptés par les Comités Techniques sont
soumis aux Comités Membres pour approbation, avant leur acceptation comme
Normes Internationales par le Conseil de I’ISO.
Avant 1972, les résultats des travaux des Comités Techniques étaient publiés
. comme Recommandations ISO; maintenant, ces documents sont en cours de
transformation en Normes Internationales. Compte tenu de cette procédure, le
Comité Technique ISO/TC 55 a examiné la Recommandation ISO/R 737 et est
d’avis qu’elle peut, du point de vue technique, être transformée en Norme
Internationale. La présente Norme Internationale remplace donc la Recomman-
dation lSO/R 7374968 à laquelle elle est techniquement identique.
La Recommandation lSO/R 737 avait été approuvée par les Comités Membres des
pays suivants :
Afrique du Sud, Rép. d’ France Pologne
Allemagne Hongrie Portugal
Australie
Inde Roumanie
Belgique Irlande Royaume-Uni
Canada Israël Suède
Danemark Italie Tchécoslovaquie
Égypte, Rép. arabe d’ Turquie
Japon
Espagne Nouvelle-Zélande U.R.S.S.
Finlande Pays-Bas Yougoslavie
Le Comité Membre du pays suivant avait désapprouvé la Recommandation pour des
raisons techniques :
Autriche
Le Comité Membre du pays suivant a désapprouvé la transform
...

NORME INTERNATIONALE 737
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEXfiYHAPOAHAII OPTAHM3AUMfl HO CTAHAAPTki3ALViW~ORGANISATION INTERNATIONALE DE NORMALISATION
Sciages de bois résineux - Dimensions - Méthodes de
mesurage
Coniferous sawn timber - Sizes - Methods of measurement
Première édition - 1975-04-01
Réf. No: ISO 737-1975 (F)
CDU 674.032-41 : 531.7
Descripteurs : bois, bois de construction, bois tendre, bois résineux, bois scié, mesurage, dimension, longueur, largeur, épaisseur.
Prix basé sur 1 page
AVANT-PROPOS
L’ISO (Organisation Internationale de Normalisation) est une fédération mondiale
d’organismes nationaux de normalisation (Comités Membres KO). L’élaboration de
Normes Internationales est confiée aux Comités Techniques ISO. Chaque Comité
Membre intéressé par une étude a le droit de faire partie du Comité Technique
correspondant.
Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent également aux travaux.
Les Projets de Normes Internationales adoptés par les Comités Techniques sont
soumis aux Comités Membres pour approbation, avant leur acceptation comme
Normes Internationales par le Conseil de I’ISO.
Avant 1972, les résultats des travaux des Comités Techniques étaient publiés
. comme Recommandations ISO; maintenant, ces documents sont en cours de
transformation en Normes Internationales. Compte tenu de cette procédure, le
Comité Technique ISO/TC 55 a examiné la Recommandation ISO/R 737 et est
d’avis qu’elle peut, du point de vue technique, être transformée en Norme
Internationale. La présente Norme Internationale remplace donc la Recomman-
dation lSO/R 7374968 à laquelle elle est techniquement identique.
La Recommandation lSO/R 737 avait été approuvée par les Comités Membres des
pays suivants :
Afrique du Sud, Rép. d’ France Pologne
Allemagne Hongrie Portugal
Australie
Inde Roumanie
Belgique Irlande Royaume-Uni
Canada Israël Suède
Danemark Italie Tchécoslovaquie
Égypte, Rép. arabe d’ Turquie
Japon
Espagne Nouvelle-Zélande U.R.S.S.
Finlande Pays-Bas Yougoslavie
Le Comité Membre du pays suivant avait désapprouvé la Recommandation pour des
raisons techniques :
Autriche
Le Comité Membre du pays suivant a désapprouvé la transform
...