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A Plain Plug Gauge is an inspection tool used to verify the dimensional accuracy of cylindrical holes in mechanical parts. It plays a critical role in quality control, especially in high-precision manufacturing. Below are the detailed aspects of a plain plug gauge:

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Purpose and Function

  • Plain plug gauges are designed to check the internal diameters of holes, bores, or other cylindrical openings.
  • They ensure the hole falls within specified tolerance limits, which is essential for parts that require precise fitment and alignment in assemblies.
  • The gauge consists of two functional ends:
    • "Go" End: This side is designed to fit into the hole if the hole is within or slightly larger than the minimum size tolerance.
    • "No-Go" End: This side should not fit into the hole if the hole is within or slightly smaller than the maximum size tolerance.

Applications

  • Manufacturing : Used to inspect parts in industries like automotive, aerospace, machining, toolmaking, and electronics.
  • Quality Control : Plug gauges ensure fitment accuracy, critical in applications where a part must interact with other components.
  • Tool Rooms & Workshops : They are indispensable in tool rooms for checking the accuracy of bores during the production of dies, molds, and jigs.
  • Maintenance : Used during preventive maintenance to ensure that the machinery or components are still within operational tolerances.