Quality Control for Stainless Steel Screws Using In Bathroom Cabinets

Quality Alert

47.8% of 304 stainless screws failed 24h acidic salt spray test (ASTM G85 A3) with pit density 3.7× over limit. 20,000 pcs rejected to prevent potential loss.

Incoming Inspection Protocol (4-Stage)

Stage 1: Sampling

1. Sampling Standard:

   • AQL 1.0 (ISO 2859-1)

   • 315 pcs randomly selected per lot (Level Ⅱ)

2. Equipment:

   • Salt Spray Chamber: Q-Lab CCT-1100

   • Material Analyzer: Olympus DELTA XRF

Stage 2: Key Tests

Stage 3: Non-conformance Handling

1. Marginal Cases:

   • 5-10 pits/cm²: Tightened inspection (AQL 0.65)

   • ＞10 pits/cm²: Full lot rejection

2. Rejection Process:

   • Issue SCAR within 72 hours

   • Root cause analysis within 15 workdays

Defect Case Study

Problematic Lot Data

• Salt Spray Test: 26 pits/cm² (520% over limit)

• Material Analysis: Cr 17.2% (below 18% minimum)

• Failure Simulation:

  • 83% screw fracture risk after 6 months

  • 47% higher leakage accident probability

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Customer Risk Forecast

1. Functional Failure:

   • Hinge loosening

   • Door detachment

   • Handle loosening

   • Panel loosening

   • Drawer track loosening

2. Aesthetic Damage:

   • Rust staining (>30cm² coverage)

   • Coating blistering (100% occurrence)

Conclusion

• Strictly following standardized procedures—such as isolation, traceability, technical analysis, return management, and supplier corrective actions—ensures that non-conforming stainless steel screws are prevented from entering production or reaching customers.

• This approach guarantees the durability and safety of bathroom cabinets in humid environments.

• Demonstrates our strong commitment to product quality and proactive risk management.

• Significantly reduces the likelihood of customer complaints, costly repairs, and potential brand reputation damage caused by screw corrosion or failure.

• Continuous improvement of incoming inspection and supplier management systems is essential for maintaining high product quality and achieving long-term customer satisfaction.

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Inquriy

If you are looking for a reliable bathroom cabinet supplier who prioritizes quality at every stage—from incoming material inspection to final product delivery—contact us today for a consultation or a free sample evaluation. Let us help you avoid hidden risks and ensure your products meet the highest durability standards for humid environments.

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