How to Send Drawings for Custom CNC Machined Parts
What buyers should prepare before quotation: 2D drawings, 3D files, material, tolerance, quantity, surface finish and application.
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Engineering Notes
Practical buyer guides for custom mechanical and hardware parts.
Notes for buyers who source CNC machined parts, machinery spare parts, faucet and plumbing hardware, 3D printed prototypes and OEM/ODM custom projects from China.
Buyer Guides
Useful information before sending drawings, samples or RFQ.
These notes help buyers reduce communication mistakes before quotation, sample production and batch order.
What Information Should Be Confirmed Before OEM/ODM Production
Before custom production, confirm drawings, samples, material, process, packaging, inspection points, lead time and shipment requirements.
Read GuideBasic Quality Checks for Mechanical and Hardware Parts
Common checks include dimensions, material, thread, surface finish, appearance, quantity, packaging and pre-shipment product photos.
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RFQ Preparation
What should buyers send before quotation?
Accurate quotation depends on clear requirements. Missing information often leads to wrong price, wrong process or repeated sample corrections.
Drawing or sample photo
Send 2D drawing, 3D CAD file, sample photo or clear sketch with key dimensions.
Material and surface finish
Confirm aluminum, steel, stainless steel, brass, plastic, coating, plating, polishing or other finish.
Quantity and target use
Prototype, small batch, repair part, assembly part and mass production may require different process choices.
Critical tolerance or function
Mark sealing areas, thread standards, mounting holes, sliding surfaces, load-bearing areas or appearance surfaces.
Packing and shipment requirement
Confirm packaging method, label, destination country and whether pre-shipment photos are required.
Inspection expectation
Tell us if you need key dimension check, thread check, appearance review, material certificate or third-party inspection.