Before you send
your drawing.
Clear answers for sourcing teams evaluating a precision metal parts manufacturer in Dongguan.
What parts does Zhenglong Precision manufacture?
We manufacture custom non-standard metal components to customer drawings, including watch cases and watch parts, 316 stainless liquid-cooling components, precision turned components, titanium screws and parts, jewelry and luxury hardware, darts and sporting components, and industrial hardware.
What materials can you process?
Our confirmed material range includes 303, 304, 316, 316L and 904-series stainless steel, brass, copper, titanium and iron. For 904-series material, the exact grade, specification and documentation requirement are confirmed in the RFQ.
What tolerance can you achieve?
Typical tolerance is down to ±0.01 mm, depending on part geometry, material, size, process and inspection method. The final tolerance must be confirmed during drawing review.
Can you support prototypes and production batches?
Yes. We support sample development and production quantities of 1,000+ pieces. Quantity, process and inspection requirements are reviewed for each project.
Which surface finishes are available?
Polishing, brushing, blasting and engraving can be completed in-house. PVD, plating and stone setting are coordinated with qualified finishing partners where required. The drawing should define visible faces, finish method and acceptance requirements.
What liquid-cooling product experience do you have?
We have machined a custom 316 stainless steel multi-port component for a liquid-cooling application. Pressure rating, leakage testing, coolant compatibility and system performance must be defined and verified for each project.
Do you directly supply Fossil or Seiko?
Through a former employer, members of our team machined watch-case projects for supply chains connected to Fossil and Seiko. At Zhenglong, our direct project history includes domestic watch brands such as Geya.
Do you have ISO 9001 or ISO 13485 certification?
No. Zhenglong Precision does not currently claim ISO 9001 or ISO 13485 certification. We provide practical dimensional and surface inspection using the equipment listed on our Quality page. For medical titanium components, we machine to customer drawings; finished-device regulatory compliance is reviewed with the device or system manufacturer during drawing review.
What should I include in a quote request?
Please include a drawing or sketch, material, prototype and production quantity, finish, critical tolerances, target timeline, destination and inspection requirements. STEP, STP, PDF and DWG files are welcome.
Ready to review your drawing?
Send part type, material, quantity, finish and target date. We reply with manufacturability and a clear next step.