12角(十二键)法兰面螺钉 - 长MJ螺纹 - 强度等级小于等于1100MPa Aerospace - Bolts, Normal Spline Head, Normal or Pitch Diameter Shank, Long Length MJ Threads, Metallic Material, Coated or Uncoated, Strength Classes Less Than or Equal to 1100 MPa
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