ISO 2236:1991

Overview

ISO 2236:1991 is an International Standard that specifies maximum outside head dimensions for forged and tubular socket wrenches used for assembly of screws and nuts. Published as the third edition (1991), it replaces the 1982 edition and was prepared by ISO/TC 29 (Small tools). The standard applies to socket wrench types listed under numbers 15 to 20 in ISO 1703 and provides envelope limits to ensure consistent external sizing and interchangeability.

Key topics

• Scope and applicability
  • Covers forged "béquille" (L‑shaped) and "pipe" (tubular) socket wrenches identified in ISO 1703 (numbers 15–20).
• Dimensional requirements
  • Prescribes maximum outside head dimensions expressed in millimetres.
  • Uses tables and figures (Table 1, Figures 1 and 2) to present dimensional limits and geometric references for different size ranges.
  • Includes size ranges and formulae for calculating envelope dimensions across given fastener sizes (see standard for exact numerical values).
• Illustrations and nomenclature
  • Contains explanatory figures for forged and tubular wrench head profiles and references the ISO 1703 nomenclature for tool classification.
• Edition history
  • Third edition (1991) cancels and replaces the second edition (1982).

Applications

ISO 2236 is practical for anyone involved in the design, manufacture, specification or procurement of hand tools and accessory sockets:

• Tool manufacturers use the standard to design forged and tubular socket wrenches that meet international envelope limits for market acceptance and interchangeability.
• Product designers and engineers reference the dimensions to ensure tool clearance and fit in assemblies, tool holders and workshop layouts.
• Quality assurance and test laboratories use the defined maxima to verify compliance during inspection and production control.
• Procurement and specification writers cite the standard when creating purchase specifications or when requiring compatibility with established tool systems.
• Standards committees and regulatory bodies use ISO 2236 to harmonize dimensional limits internationally.

Related standards

• ISO 1703:1983 - Nomenclature of assembly tools for screws and nuts (referenced by ISO 2236 for tool numbering and classification).
• ISO 2236 was developed by ISO/TC 29 (Small tools); consult committee publications for related tool standards.

By adopting ISO 2236, organizations ensure consistent external dimensions for forged and tubular socket wrenches, improving interchangeability, storage and ergonomic planning across international markets.