Overview
ISO 16124:2015 - Steel wire rod - Dimensions and tolerances specifies standardized dimensions, nominal sizes and dimensional tolerances for hot‑rolled steel wire rod (as defined in ISO 6929). The standard sets preferred nominal sizes, cross‑sectional areas and mass per unit length for common profiles (round, square, hexagonal and rectangular), and defines the tolerance classes used for production, inspection and purchase specifications.
(Note: the published extract is a redline comparison of editions. For implementation use the official clean ISO publication.)
Key topics
- Scope and reference: Applies to hot‑rolled steel wire rod and references ISO 6929 for definitions and classification.
- Profiles covered: Round, square, hexagonal and rectangular wire rod with tables of preferred nominal sizes and corresponding cross‑sectional area and mass per unit length.
- Tolerance classes: Standardized tolerance levels (T1, T2, T3 and in some cases T4) for diameters, widths and thicknesses. These allow suppliers and users to select required precision for a given application.
- Out‑of‑shape limits: Permissible out‑of‑round, out‑of‑square and out‑of‑hexagon are specified as a percentage of the total dimensional tolerance (commonly 80% of the total tolerance).
- Measurement and inspection: Clauses address inspection on cross‑sectional dimensions and mass of coils to ensure conformity with nominal values and tolerances.
- Tables and examples: Includes tables showing preferred nominal diameters (e.g., 5 mm to 60 mm ranges), cross‑sectional areas (S = 0.7854 d² for round) and mass per unit length formulas (Mass/m = 0.00785 S).
Applications
ISO 16124 is used by:
- Steel mills and wire rod producers to define production targets, tolerance classes and coil mass specifications.
- Quality and inspection teams for incoming material acceptance and dimensional control.
- Purchasing and procurement to write clear supply contracts and technical purchase orders specifying profile, nominal size and tolerance class.
- Design and manufacturing engineers who select wire rod feedstock for wire drawing, reinforcement, fasteners, springs and cold‑formed components.
- Testing laboratories performing dimensional verification and coil mass measurements.
Related standards
- ISO 6929 - Steel products: definitions and classification (normative reference for ISO 16124).
- Users should also consult other ISO/industry standards relevant to wire production, mechanical properties and surface condition when specifying complete material requirements.
Keywords: ISO 16124, steel wire rod, dimensions and tolerances, wire rod tolerances, round wire rod, square wire rod, hexagonal wire rod, rectangular wire rod, out‑of‑round, mass per unit length, ISO 6929.
