Overview
ISO 6363-4:2022 specifies tolerances on form and dimensions for cold‑drawn wrought aluminium and aluminium‑alloy rectangular bars and wires. The standard covers thicknesses from 2 mm to 60 mm and widths up to 200 mm. It applies to drawn rectangular bars (Clauses 5.1–5.4) and to drawn wires for dimensional tolerances (only Clause 5.1). Note: this part does not apply to wires intended for electrical, welding or aeronautical purposes.
Keywords: ISO 6363-4:2022, wrought aluminium, drawn rectangular bars, tolerances on form and dimensions, cold-drawn wires
Key topics and technical requirements
- Scope and material grouping
- Alloys are grouped into Group I and Group II (different manufacturing behavior and tolerance limits).
- Alloy lists reference ISO 6362‑7 and the Aluminum Association “Teal sheets.”
- Tolerances on width and thickness
- Detailed tolerance tables (Tables 3 and 4) define permissible deviations by width (b) and thickness (a), different for Group I and Group II alloys.
- Measurements are taken excluding corner radii.
- Fixed‑length and length tolerances
- Maximum permissible length tolerances for fixed‑length bars are in Table 5; squareness of cut ends must be within half the fixed‑length tolerance.
- Corner radii
- Maximum allowed corner radii for rectangular bars are specified (Table 6) to ensure slightly rounded corners without exceeding limits.
- Form tolerances
- Flatness (Table 7), straightness and twist tolerances (Table 8) are specified. Example: straightness is limited to 2 mm per 1 000 mm of length and not more than 0.6 mm per 300 mm.
- Measurement procedures: form tolerances are assessed by placing the bar on a horizontal plate under its own mass (figures illustrate measurement setups).
- Squareness
- Maximum deviation from square is given by a formula in Table 9 (e.g., proportional to thickness).
Practical applications and users
ISO 6363-4:2022 is used by:
- Manufacturers and cold‑drawing mills to set production tolerances and quality targets.
- Quality control and inspection teams for acceptance testing of drawn rectangular aluminium bars and wires.
- Purchasing/specification engineers and procurement teams to write unambiguous material specifications.
- Designers and fabricators who require dimensional and form consistency for assembly, machining or final products (automotive, construction, general engineering).
- Testing laboratories and certification bodies verifying compliance with international tolerances.
Related standards
- ISO 6363-1 - Technical conditions for inspection and delivery (normative reference)
- ISO 6362-7 - Chemical composition for extruded alloys (alloy listings)
- Aluminum Association “Teal sheets” - International alloy designations
Use ISO 6363-4:2022 to ensure consistent dimensional quality of cold‑drawn aluminium rectangular bars and wires and to harmonize buyer/supplier expectations across the supply chain.