Three Critical Stages of Machining Quality Control

Reliable suppliers implement rigorous checks at:

1. Material Inspection

Material verification (spectral analysis)

Hardness testing

2. First-Article Inspection

Full CMM measurement

Functional testing (GO/NO-GO gauges)

3. Final Inspection

100% critical dimension verification

Coating thickness verification

Packaging and rust prevention checks

Request detailed inspection reports with actual measurements rather than relying solely on ISO certificates.