This is the latest revision of one of the main technical parts of the ISO 8062 series on Geometrical Product Specification (GPS). The series covers moulded parts and deals specifically with tolerances and allowances for castings. BS EN ISO 8062-4:2023 defines a system of tolerance grades, including general geometrical tolerances using surface profile tolerances, and how to show them.
mechanical engineers, design engineers, engineering designers, manufacturing engineers and production engineers who work in the aerospace, defence, automotive, rail, nuclear, and medical devices
engineering or manufacturing organizations that produce castings as part of their manufacturing and development processes.
It specifies the rules for geometrical dimensioning and tolerancing of final moulded parts and parts machined out of moulded parts. It also specifies rules and conventions for the indications of these requirements in technical product documentation and specifies the proportions and dimensions of the graphical symbols to be used.
BS ISO 8062-4 also:
provides symbols for identifying the relative completeness of the moulded features and parts
specifies general geometrical tolerances using surface profile tolerances
specifies machining allowances and draft angles (tapers)
establishes the general principles for presentation of general geometrical tolerances.
It provides a clear, consistent approach for general tolerances for castings using profile tolerancing in a general datum system.
It helps users specify unambiguously and manufacture more accurate products.
It can help users enter new markets and increase confidence in products.
BS ISO 8062-4:2023 has been updated to clarify the approach for users.
This is a revision of BS ISO 8062-4:2017 which is replaced and superseded. The major changes in BS ISO 8062-4:2023 are:
ISO 8062-4