Watch case

For luxury or professional-grade watch cases, 316L Stainless Steel is the industry standard due to its corrosion resistance and hypoallergenic properties. For premium markets, consider Grade 5 Titanium for its superior strength-to-weight ratio or Carbon Fiber for a modern, sporty aesthetic. Ensure the supplier uses CNC machining for precision tolerances, typically requiring an accuracy of ±0.01mm to ensure movement fit and water resistance.

Buyers must specify the required ATM rating (3ATM, 5ATM, 10ATM, or 20ATM). You should request vacuum leak test reports and pressure test certifications (ISO 22810 or ISO 6425 for divers). Ensure the case design includes high-quality O-ring gaskets and, for high-pressure needs, a screw-down crown and case back to maintain seal integrity.

To enhance durability, prioritize PVD (Physical Vapor Deposition) coating over traditional electroplating, as it offers significantly higher scratch resistance and color longevity. Common finishes include mirror polishing, satin brushing, and sandblasting. For high-end black finishes, DLC (Diamond-Like Carbon) is recommended for its extreme hardness.

Ensure all materials are RoHS and REACH compliant to avoid hazardous substances like lead or nickel, which is critical for the EU market. For the US market, ensure compliance with California Proposition 65. If the case includes glass, specify Sapphire Crystal with Anti-Reflective (AR) coating to meet premium consumer expectations for scratch resistance.

Implement a strict QC protocol by hiring a third-party inspection agency to perform an AQL (Acceptable Quality Level) 1.5 or 2.5 inspection before final payment. Focus on visual defects (scratches, burrs), thread smoothness for screw-down parts, and dimensional accuracy using calipers to ensure the movement fits perfectly without rattling.

Start by requesting a prototype or sample to evaluate the finish quality. When negotiating, leverage volume-based pricing; for example, a 500-unit order may reduce costs by 15-20% compared to a 100-unit order. Discuss tooling/mold costs upfront—reputable suppliers may waive these fees if the initial order meets a specific threshold (e.g., 1,000+ units).

Watch cases are prone to surface scratches during transit. Insist on individual protective film for each case and custom foam trays or blister packaging to prevent metal-on-metal contact. For international shipping, use air freight for high-value components to minimize humidity exposure and handling time, ensuring the goods are insured for their full declared value.

Always use Secured Trading Services provided by Made-in-China.com to protect your payments. Avoid direct wire transfers to personal accounts. Ensure the Proforma Invoice (PI) clearly states the technical specifications, lead times, and refund policies for non-compliant goods. Verify the supplier's Audited Supplier status to confirm their factory's existence and production capacity.