Sample Inspection vs Bulk Inspection
When to inspect a supplier's sample versus the full production run — and why the two serve different purposes in a China sourcing workflow.
Published October 3, 2026
Sample inspection and bulk inspection are often treated as the same activity with different names. They aren’t. One tells you whether to order; the other tells you whether what ships is what you approved. Confusing them is how bad batches get delivered.
Sample inspection
Done on the supplier’s sample, before a production order. Its job is to validate the product concept: materials, workmanship, function, and whether this supplier can make what you pictured.
Use it to:
- Decide if the supplier is capable
- Lock an approved reference sample
- Catch design flaws early
A great sample proves the supplier can make it. It does not prove they will make it identically at volume.
Bulk / pre-shipment inspection
Done on the actual production run, before it leaves the factory or warehouse. Its job is to validate the batch: that the units shipping match the approved sample and meet your AQL limits.
Use it to:
- Confirm consistency across the run
- Catch process drift, mixed stock or substitutions
- Decide pass/fail before goods move
Why you need both
A sample can be hand-picked and perfect; the bulk run can drift via material swaps, worker turnover or rushed production. Without bulk inspection, you’re trusting that the sample predicted the batch. Sometimes it does. Often it doesn’t.
The takeaway
Sample inspection answers “should I order?” Bulk inspection answers “should this ship?” Use sample to choose, bulk to protect — and never let one stand in for the other.