Engineering File Checklist
Drawings and CAD Files Checklist for OEM Factory Quotation
This article focuses only on engineering files. It supports the main RFQ guide by explaining which documents help a factory understand dimensions, geometry, assembly fit and revision control.
Minimum Files To Send
- A 2D PDF or DWG drawing with dimensions, tolerances and notes.
- A 3D model such as STEP, STP, IGES or native CAD for complex geometry.
- Photos or samples when the part already exists and visual details matter.
- Revision history if the design has changed during development.
- Assembly drawings when the part must fit with other components.
Why Both 2D And 3D Files Matter
- The 3D model helps engineering teams understand shape, machining access and fixture planning.
- The 2D drawing remains important because it defines tolerances, threads, datum references, surface finish and inspection requirements.
- When the 3D model and 2D drawing conflict, buyers should identify which file controls the quote.
Useful Notes For Faster Review
- Mark critical dimensions and assembly interfaces clearly.
- Separate cosmetic requirements from functional requirements.
- Confirm whether equivalent materials or alternative processes are allowed.
- Include the expected annual volume if tooling, fixture or automation decisions may affect cost.
Where This Fits In The RFQ Process
This file checklist is one part of a complete RFQ package. For the broader RFQ structure, read the complete RFQ package guide.
For drawing review from the factory side, read how factories review drawings before quotation.
Next Step
Send 2D drawings, 3D CAD files and revision notes for a more accurate engineering review.
Contact NBFEIYU or use the OEM/ODM RFQ checklist to prepare your project information.
Quick Answer
The practical answer depends on the part function, material, quantity, tolerance, finishing and inspection requirements. A factory review before production helps convert those requirements into a controlled process.
Buyer Checklist
- Define the part function and critical features.
- Confirm material, quantity, tolerance and finish.
- Agree sample approval and inspection standards.
- Record packaging and shipment requirements.
FAQ
What should buyers send for review?
Send drawings, models, material details, quantity, finish and any inspection or packaging requirements.
Why involve the factory before production?
Early review can identify process, fit, finishing, inspection and delivery risks while changes are still manageable.
Need Help With a Custom Manufacturing Project?
Send drawings, samples, materials, quantity, tolerance, finishing, inspection and packaging requirements. Nbfeiyu can review manufacturability, process route, quality checkpoints and quotation details before production.