Clear answers before you send the drawing.

Send a 3D STEP, STP or X_T file for geometry. Add a PDF or DWG drawing when the part has tolerances, threads, GD&T, finish, material or inspection requirements.

Include material, quantity, finish, critical tolerances, inspection documents and the required delivery date. Mark cosmetic surfaces and special requirements on the drawing.

Price is mainly driven by material, geometry, setup, machining time, tolerance, quantity, finishing and inspection. A simpler tolerance or larger batch can reduce the unit cost.

Yes. We review manufacturability, material, tolerances, tool access and finishing risks before production. If a change is needed, we explain it for your approval.

No fixed minimum. We support one-off parts, prototypes, low-volume batches and repeat production.

Our main services are CNC milling, CNC turning, micro machining, sheet metal fabrication, 3D printing and surface finishing.

Yes. A project may combine machining, EDM, grinding, heat treatment, coating, assembly and inspection. We confirm the complete route during technical review.

Yes, after geometry review. We match the part to 3-axis, 4-axis, 5-axis, turning, Swiss-type or secondary processes based on the critical features.

Yes. We support first prototypes, pilot batches, low-volume production and repeat orders. The control plan can be adjusted as quantity and risk increase.

It depends on geometry, material, tolerance, quantity and finish. Send the model and drawing; we will recommend the most practical route.

We work with common aluminum, stainless steel, carbon and alloy steel, tool steel, titanium, brass, copper, nickel alloys and engineering plastics. Availability is confirmed by grade and stock form.

Typical CNC machining tolerances can reach ±0.01 mm. Critical features down to ±0.005 mm may be possible after reviewing geometry, material, process and inspection method.

We will clarify the applicable general tolerance before production. Add explicit tolerances only where fit or function requires them to avoid unnecessary cost.

Common options include anodizing, hard anodizing, passivation, plating, black oxide, powder coating, brushing, polishing and bead blasting. Compatibility depends on the base material.

Yes. We can compare machinability, strength, corrosion, temperature, finish and availability. Any substitution requires your approval before production.

Requirements are reviewed before production, followed through manufacturing and checked before release. Inspection depth is matched to the part risk and agreed specification.

The inspection method is selected by feature and tolerance. Available equipment includes CMM, height gauges, micrometers, calipers and surface roughness testing.

Yes. Dimensional reports, first article records and other agreed inspection documents can be supplied when requested during quotation.

Yes, when available and specified before ordering. State the required certificate type, material standard and lot traceability in the RFQ.

We reference the approved drawing revision, material, process notes, finish and inspection requirements. Changes are reviewed before the repeat order is released.

Qualified simple parts can start from 3 business days. The confirmed schedule depends on complexity, quantity, material, finish and inspection requirements.

Lead time begins after the drawing, technical requirements, quotation and order details are approved and the required material is available.

Sometimes. We first check material, machine capacity, finishing and inspection. If an expedited schedule is practical, it will be stated in the quotation.

Contact us immediately. Changes before production are usually simpler; changes after material cutting or machining may affect cost and delivery.

We select express, air or other suitable freight based on size, weight, destination and urgency. The shipping method and terms are confirmed with the order.

OUJI is based in Dongguan, Guangdong, China, supporting overseas engineering and procurement teams.

Yes. Send your NDA for review before sharing sensitive project files, or ask us for a standard confidentiality agreement.

Your OUJI contact coordinates drawing questions, production updates, inspection requirements and delivery follow-up with the relevant engineering resources.

We support startups, engineering teams, equipment builders and procurement teams that need custom prototypes or low-volume precision parts.