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Document History

  1. BS EN 4609:2019


    Aerospace series. Spiral drive recesses for threaded fasteners. Geometrical definition and technical requirements

    • Most Recent
  2. BS 02/708728 DC

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    EN 4609. Technical Specification for Internal Drive, Extended Nose, Asymmetric Spiral Recess (Motorq) drie system for rotary fastening devices

    • Historical Version