Finding a reliable lamp cap supplier in China starts with measurable compliance requirements. IEC 60061 should define cap dimensions, gauge checks, contact positions, and interchangeability. Ask for controlled drawings and recent inspection records. Do not accept a general “IEC compliant” statement.
RoHS and REACH evidence also needs careful review. Request material declarations, restricted-substance test reports, and a clear production-batch link. Independent laboratory results are useful, but they must match the actual alloy, plating, and plastic grade. I have seen reports with correct dates but unclear sample identities. That weakness deserves attention. Check whether the supplier controls lead, mercury, cadmium, hexavalent chromium, and restricted flame retardants. Keep the documents updated when materials change.
AQL 1.0 and 2.5 can structure incoming inspection. Many buyers set AQL 1.0 for major defects and AQL 2.5 for minor defects, but the agreement must define each defect precisely. A bent contact may stop assembly. A small surface mark may not. Specify lot size, inspection level, sample quantity, and acceptance numbers before production begins. Request first-article samples, dimensional reports, plating-thickness readings, and traceability labels. Visit the factory when possible. Observe gauges, sampling habits, and how rejected parts are isolated. A supplier may pass one audit and still drift later, so periodic checks remain necessary.
