Through accumulated experience by coordinated with the world-class 3rd party testing labs, Stone process control team guarantees us to provide quality parts to every customer.

Stone Quality Control Process – It is a process through to ensure that product quality is maintained.
  • IQC - Incoming Quality Control

    It is the process of inspecting the raw and component materials upon arrival. When found the defective parts, need to return or exchange, and the ultimate purpose is to make sure products quality will not be affected.

  • IPQC - In-process Quality Control

    It is crucial because it can detect and handle the problem that occurs ahead of time.

  • OQC - Outgoing Quality Control

    It is the inspection of products before shipping. It's a crucial step in ensuring the shipment is defect-free.


    • Plan - Organization should plan and establish the process related objectives and determine the processes that are required to deliver a high-Quality end product.

    • Do - Development and testing of Processes and also "do" changes in the processes.

    • Check - Monitoring of processes, modify the processes, and check whether it meets the predetermined objectives.

    • Act - A Quality Assurance tester should implement actions that are necessary to achieve improvements in the processes.

  • IATF16949-2016
  • ISO 9001 2015
  • PED


  • Head Office

    Stone industrial Co., LTD

    Tel: +86 28 8666 2540

    Fax: +86 28 8666 2034


  • Filiale in USA

    Stone Metals America, LLC

    Tel: 469.450.1671

  • Filiale in Germany

    Stone & Robert Maschinenteile GmbH

    Tel: 0049 (0) 2406 / 66 76 275