High-Quality Metal Terminals Service & Products

Critical CNC-milled and turned features are consistently held to ±0.005 mm (5 microns), with standard production tolerances held at ±0.01 mm. For progressive stamped metal terminals, strip thickness and width tolerances are maintained within ±0.008 mm, with piercing burr heights controlled below 0.01 mm. Final achievable tolerances depend on the chosen alloy, work hardening rates, and geometry, and are reviewed in detail during the initial DFM engineering audit.

All high-precision CNC machining, Swiss-type lathe turning, progressive die stamping, and tooling assembly take place in Sunmy-owned facilities located in Shenzhen. Raw metal casting and specialized electroplating (e.g., selective gold, silver, or electroless nickel) are performed by our long-term, audited ISO-certified partner plants. Every single finished component is returned to Sunmy facilities for 100% final CMM dimensional inspection, pull-force verification, and FAI documentation before global packaging.

We enforce strict data-protection protocols. Before receiving any 2D drawings or 3D STEP/IGES CAD files, Sunmy executes a formal bilingual Non-Disclosure Agreement (NDA). Furthermore, your design files remain confined to our secure internal engineering servers and are accessible only to authorized project engineers, preventing data leakage through third-party trading intermediaries.

Standard shipment packages include Mill Material Certificates (EN 10204 Type 3.1) showing metallurgical chemical and physical compositions, complete First Article Inspection (FAI) reports with ballooned engineering prints, Coordinate Measuring Machine (CMM) dimensional data, plating thickness XRF scan charts, and RoHS 2.0 / REACH compliance declarations. Salt-spray corrosion test reports are provided upon request.

Yes. We regularly machine prototype quantities (from 10 to 500 pieces) using multi-axis CNC milling and wire EDM cutting to validate mechanical form and electrical contact resistance before tooling commitment. Once verified, our engineers transition the component into multi-cavity progressive stamping dies or high-pressure die casting, delivering up to millions of units per annum with consistent Cpk levels.

Our engineering team reviews submitted 2D/3D datasets and returns comprehensive Design for Manufacturability (DFM) feedback—including material optimization, tolerance stack-up analysis, and itemized quotations—within 24 hours of receipt.