| 1 |
Confirm the actual section geometry |
Define the nominal web depth as 150 mm, then specify flange width, lip size, profile shape, overall length, punch-outs, and dimensional tolerances. A “150mm stud” normally identifies the web depth only; it does not fully define the section.
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ASTM C645 for nonstructural steel framing members; ASTM C955 where the studs are intended for load-bearing applications; EN 14195 for metal framing components used in gypsum board systems.
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Approved profile drawing, sectional dimensions, tolerance schedule, product data sheet, and a sample or first-article approval record.
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Measure web depth, flange width, lip length, overall length, hole position, and squareness with calibrated steel rules, calipers, and a measuring fixture. Compare results with the approved drawing.
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The supplier lists only “150 mm” without flange dimensions, gauge, tolerance, or an approved drawing. Excessive variation can cause poor board alignment and difficult installation.
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| 2 |
Verify base-metal thickness and steel grade |
Specify whether the stated thickness is base-metal thickness or coated thickness. Define the required steel grade and minimum yield strength according to the project design. For structural applications, grade selection must be confirmed by a qualified engineer.
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EN 10346 for continuously hot-dip coated flat steel products; common European designation examples include DX51D for forming steel and higher-strength grades such as S280GD or S350GD when specified. ASTM A653/A653M is commonly used for galvanized sheet steel in North American specifications.
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Mill test certificate showing heat or coil number, steel grade, nominal thickness, mechanical properties, and coating designation. Request traceability from the certificate to the production lot.
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Verify thickness at several locations away from edges and holes using a calibrated micrometer. Review the certificate and, when required, conduct tensile testing through an accredited laboratory.
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Thickness is measured only on the finished coating, the certificate uses an unapproved grade, or the reported strength values cannot be traced to the supplied coil.
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| 3 |
Check corrosion-protection requirements |
Specify the coating type and minimum coating mass or thickness. Galvanized coating designations such as Z120 or Z275 under EN 10346 represent total coating mass on both sides in g/m²; the correct value depends on the environment and project specification.
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EN 10346 for continuously hot-dip coated steel; ASTM A653/A653M for galvanized sheet coating designations; ISO 1461 is generally associated with batch hot-dip galvanizing and should not automatically be substituted for coil-coated sheet requirements.
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Coating designation, coating-mass or thickness test report, surface-treatment description, and environmental suitability statement. Salt-spray results should be treated as supplementary evidence, not as a direct replacement for coating specification.
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Check the coating by a suitable calibrated method, such as magnetic coating-thickness measurement or laboratory coating-mass testing. Inspect cut edges, punch-outs, scratches, white rust, bare spots, and uncoated areas.
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A generic statement such as “galvanized” is provided without coating designation or test results. Heavy white rust, exposed steel, or inconsistent coating can reduce service life.
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| 4 |
Match the product standard to the application |
Decide whether the stud is for a non-load-bearing partition, ceiling system, shaft wall, exterior framing, or load-bearing wall. A 150mm profile must not be selected by size alone; design loads, span, deflection, fire, acoustic, and moisture requirements also apply.
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EN 14195 covers metal framing components for gypsum board systems. ASTM C645 covers nonstructural steel framing members, while ASTM C955 covers load-bearing steel framing members. Installation references may include ASTM C754 for nonstructural framing.
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Declaration of performance or product conformity documentation where applicable, technical datasheet, load tables, fire or acoustic system test reports, and installation instructions for the intended system.
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Confirm that the product category, thickness, grade, and test configuration correspond to the intended wall or ceiling assembly. Review the complete system rather than approving the stud in isolation.
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A nonstructural stud is marketed for load-bearing use without design data, or a fire-rating claim is made for the metal profile alone instead of the complete tested assembly.
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| 5 |
Validate certification and market-access claims |
Certification must identify the exact product scope, manufacturing site, standard, certificate holder, validity period, and certification body. ISO 9001 demonstrates a quality-management system; it does not by itself certify steel grade, dimensions, or structural performance.
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For European construction-product markets, verify whether the specific product and intended use fall under the Construction Products Regulation and whether a Declaration of Performance and CE marking route applies through the relevant harmonized standard. Local building regulations may impose additional requirements.
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Certificate PDF issued by the certification body, certificate number, scope, validity, audit status, Declaration of Performance when applicable, and product-label photographs showing batch or lot identification.
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Confirm certificate details directly through the issuing body’s public verification system or official contact channel. Check that the certificate scope matches the supplied profile and production location.
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An undated logo, unverifiable certificate number, certificate issued for a different product, or an ISO 9001 certificate presented as proof of product compliance.
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| 6 |
Audit manufacturing and process control |
Review coil identification, roll-forming setup, tooling maintenance, straightening, cut-to-length control, punch-out accuracy, packaging, and nonconforming-product control. Ask for the inspection frequency and acceptance criteria.
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ISO 9001 can provide a framework for quality-management processes. Test and measurement methods should be stated in the purchase specification and aligned with the applicable product standard.
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Process-flow chart, control plan, inspection records, calibration certificates, corrective-action records, internal audit summary, and a sample batch traceability report.
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Conduct a pre-shipment inspection or independent third-party inspection. Sample multiple bundles and production locations rather than checking only one visible piece.
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No lot traceability, expired calibration records, undocumented rework, uncontrolled tooling changes, or inspection records that contain no actual measurements.
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| 7 |
Control packaging, logistics, and final acceptance |
Agree on bundle quantity, maximum bundle weight, protective separators, moisture protection, labeling, Incoterms, loading method, and storage instructions. Long 150mm studs must be protected from bending and telescoping during transport.
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Use the agreed contract specification together with applicable packaging, workplace-safety, and import requirements in the destination country. For international shipment, ensure labels and shipping documents identify profile, length, quantity, batch, and country of origin accurately.
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Packing list, commercial invoice, certificate of origin when required, loading photographs, bundle labels, inspection release note, and a written claims procedure with defined acceptance tolerances.
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Inspect bundle count, random lengths, straightness, surface condition, labels, moisture damage, edge deformation, and conformity between packing documents and physical goods before signing final acceptance.
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Bundles are overloaded, exposed to trapped moisture, poorly supported, unlabeled, or shipped without a documented procedure for shortages, damage, or out-of-tolerance material.
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