China Sheet Metal Box Supplier & Precision Manufacturers

For standard CNC sheet metal box fabrication (laser cutting, turret punching, and CNC press-brake bending), our linear tolerances typically range within ±0.1 mm to ±0.2 mm. For precision mating tabs, hole center distances, and CNC secondary post-machined features (such as milled bearing housings or threaded mounting bosses), we consistently hold ±0.005 mm to ±0.01 mm, thoroughly verified on our coordinate measuring machines (CMM).

CNC laser cutting, CNC bending, metal stamping (progressive die and deep drawing), riveting (PEM hardware insertion), and in-house CMM metrology inspection are conducted entirely inside our Shenzhen-owned facilities. For complex surface treatments (e.g., anodizing, heavy-duty powder coating, zinc plating) and high-volume die casting, we collaborate with our long-term, audited ISO 9001 partners, with final QC inspections executed strictly by Sunmy quality assurance engineers.

We enforce strict Non-Disclosure Agreements (NDAs) signed prior to exchanging technical CAD files (.STEP, .IGES, .DWG, .PDF). Sourcing teams interact directly with our in-house engineering and production staff. Your proprietary intellectual property is never redistributed or subcontracted to open broker exchanges, preserving complete confidentiality.

Every shipment includes an authoritative documentation package: Mill Test Reports (MTR) verifying raw metal composition (chemical and mechanical), First Article Inspection (FAI) reports with bubble drawing references, CMM coordinate inspection records, and RoHS/REACH compliance declarations where required.

Yes. We routinely produce rapid prototypes (1-50 units) using flexible CNC fiber laser cutting and press brake tooling, minimizing upfront tooling costs. Once the enclosure design is thoroughly field-validated, our toolmaking division builds hard progressive stamping dies or deep-drawing tools to support production runs exceeding 100,000+ units annually at significantly reduced per-unit costs.

Upon receipt of your complete drawing package (3D model + 2D drawing with GD&T callouts), our manufacturing engineers provide a comprehensive DFM analysis and clear quotation within 24 hours, addressing bend relief issues, minimum hole-to-edge clearances, and cost-reduction opportunities.