Overview
ISO 6362-3:2022 - "Wrought aluminium and aluminium alloys - Extruded rods/bars, tubes and profiles - Part 3" - specifies tolerances on form and dimensions for extruded rectangular bars. It applies to extruded rectangular aluminium and aluminium-alloy bars with thicknesses from 2 mm to 240 mm and widths from 10 mm to 600 mm. This fourth edition (2022) updates alloy groupings and corrects editorial errors from the 2012 edition.
Key topics and technical requirements
The standard defines measurable dimensional and shape requirements for quality control and acceptance:
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Dimensional tolerances (width & thickness)
- Separate tolerance tables for Alloy Group I and Alloy Group II covering combinations of width (b) and thickness (t).
- Tolerances vary with size; for example, narrow bars (10–18 mm width) have tighter limits than wide sections.
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Corner radii
- Maximum corner radii specified by thickness ranges (e.g., Group I: 0.6 mm max for t ≤ 10 mm; Group II: up to 5.0 mm for t ≤ 240 mm).
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Fixed-length tolerances and squareness of cut ends
- Permissible fixed-length tolerances given for lengths L ≤ 2 000 mm, up to 8 000 mm, with squareness of cut ends required to be within half the fixed-length tolerance.
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Form tolerances (measurements are made with bar supported on a horizontal base plate)
- Flatness (convexity/concavity) - allowable deviation e by width ranges.
- Straightness - limits per 1 000 mm and in any 300 mm section.
- Twist - allowable twist per 1 000 mm and per total length segments.
- Squareness (cross-section) - maximum deviation Z relative to thickness.
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Materials and alloy grouping
- Alloys are listed (see ISO 6362-7) and divided into Group I and Group II to reflect manufacturing difficulty; some specific alloys were added in the 2022 update.
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Temper exceptions
- Shape tolerances do not apply to tempers O, H111, H112 and TX510 type tempers.
Applications and users
ISO 6362-3:2022 is used by:
- Extrusion manufacturers for production tolerance control and process setup.
- Quality inspectors and testing labs to verify compliance with dimensional/form tolerances.
- Procurement and purchasing to specify acceptance criteria in contracts.
- Design and fabrication engineers who require toleranced sections for assemblies and machining allowances.
- Standards compliance teams for regulatory and contractual conformity.
Keywords: ISO 6362-3:2022, extruded rectangular bars, wrought aluminium, tolerances, flatness, straightness, twist, corner radii, alloy groups.
Related standards
- ISO 6362-1 - Technical conditions for inspection and delivery.
- ISO 6362-7 - Chemical composition and alloy listings referenced in this document.
Open preview (PDF)Wrought aluminium and aluminium alloys — Extruded rods/bars, tubes and profiles — Part 3: Tolerances on form and dimensions for extruded rectangular bars
