Enclosures and cabinets
Check door gaps, hinge and lock fit, grounding points, cable openings, panel flatness, coating coverage, visible faces, labels, and packing protection.
Buyer quality guide
Sheet metal quality inspection checklist for OEM buyers.
Use this checklist to define critical dimensions, visible surfaces, weld and coating expectations, hardware fit, assembly checks, and export packing before sample or production starts.
Start inspection planning before the sample order
Inspection requirements are easiest to control when they are attached to the drawing, RFQ, and sample approval notes instead of added after production starts.
- Mark critical dimensions, datums, hole positions, bend angles, flatness, and mating edges directly on the drawing.
- Identify visible surfaces, protected faces, burr limits, weld cleanup requirements, and areas where handling marks are not acceptable.
- Define hardware, hinge, latch, insert, thread, grounding, cable-entry, and assembly-fit checks before the supplier quotes production.
- Share packing rules for coated panels, large enclosures, export cartons, labels, pallets, and part separation.
Inspection checklist table
Use this table to turn broad quality expectations into quote-ready inspection inputs.
| Inspection area | What to define | Why buyers should define it early |
|---|---|---|
| Drawing control | Active revision, units, datums, critical dimensions, tolerance notes, and sample approval status. | Prevents the supplier from inspecting against an obsolete or incomplete baseline. |
| Cut and formed features | Hole positions, slot sizes, edge burr limits, bend angles, flange lengths, flatness, and mating edges. | Focuses inspection on features that affect assembly fit and downstream hardware. |
| Welding and grinding | Weld location, visible weld areas, cleanup level, distortion risks, fixture fit, and strength-critical joints. | Helps balance weld appearance, distortion control, and functional requirements. |
| Surface finish | Visible faces, protected faces, color or texture, masking zones, coating coverage, and cosmetic acceptance rules. | Reduces disputes over surface appearance and handling after fabrication. |
| Hardware and assembly | Insert threads, studs, hinges, locks, fasteners, grounding points, cable-entry hardware, and final fit checks. | Confirms the part is ready for installation instead of only dimensionally acceptable. |
| Packing and shipment | Part separation, carton limits, label content, pallet rules, coated-surface protection, and destination constraints. | Protects finished parts during export and avoids last-minute packing changes. |
Inspection focus by project type
Different sheet metal projects need different quality controls. Match the inspection plan to how the part will be used.
Panels and covers
Check hole alignment, edge burrs, bend angles, surface scratches, coating consistency, masking boundaries, and carton separation for visible faces.
Brackets and frames
Check mating holes, fixture fit, bend consistency, weld location, flatness, thread quality, load-related features, and installation hardware.
Sample approval notes to send back
When a sample is reviewed, short approval notes help turn feedback into repeatable production instructions.
Approve the baseline
Record the drawing revision, sample date, accepted finish, accepted packing method, and any reference photos.
Separate must-fix issues
Classify functional fit, safety, corrosion, appearance, and packing issues separately so each item has a clear owner.
Confirm production checks
List the dimensions, hardware, coating, visual surfaces, and packing points that should be checked during repeat orders.
Connect inspection details to the right RFQ path
Send inspection requirements with the service page that matches your main manufacturing risk.
Complete fabrication
Use when inspection spans cutting, bending, welding, hardware, finish, assembly, and export packing.
Laser cutting
Use when critical inspection points are flat profiles, holes, slots, burr direction, and downstream forming fit.
Powder coating
Use when the main risk is visible finish, color, texture, masking, hardware sequence, or coated-surface packing.
Sheet metal inspection FAQ
What should an OEM buyer mark as critical on a sheet metal drawing?
Mark dimensions, hole locations, datums, bend angles, flatness, mating edges, visible surfaces, hardware locations, and assembly fit points that affect function or appearance.
When should inspection requirements be shared with the supplier?
Share inspection requirements with the RFQ or before sample production, so the supplier can plan process controls, quote inspection effort, and avoid late production changes.
How should cosmetic requirements be described for coated sheet metal parts?
Identify visible faces, protected areas, color or texture expectations, masking zones, burr limits, weld cleanup needs, and any areas where handling marks are unacceptable.
Ready to include inspection details in an RFQ?
Send drawings, material, finish, quantity, critical dimensions, visible-surface notes, packing rules, and destination country. We will respond with drawing review questions.
