A thread setting plug is used in conjunction with ring gages as part of the inspection process for threaded parts. While ring gages are used to inspect the external threads of cylindrical parts, thread setting plugs are used to inspect the internal threads, ensuring that both the internal and external threads of a part meet the specified requirements.

Here’s how a thread setting plug works in use with ring gages:

  1. Verification of Thread Fit: Thread setting plugs are designed to simulate the mating external threads of the part being inspected. When the thread setting plug is inserted into the thread ring gage, it should engage smoothly and fit snugly, indicating that the internal threads are properly formed and within the specified tolerance limits.
  2. Dimensional Inspection: Thread setting plugs are precision instruments manufactured to exact specifications. By using a thread setting plug along with a ring gage, manufacturers can perform comprehensive dimensional inspections of both internal and external threads to ensure that they meet the specified dimensional requirements, including pitch diameter, thread depth, and thread form.
  3. Calibration: Thread setting plugs are used for the calibration and verification of ring gages. By inserting the thread setting plug into the ring gage, manufacturers can ensure that the ring gage is accurately sized and calibrated to the specified thread dimensions. This helps maintain the accuracy and reliability of the inspection equipment used in the production process.
  4. Quality Control: The use of thread setting plugs in conjunction with ring gages is essential for quality control purposes. By inspecting both internal and external threads of threaded parts, manufacturers can identify any deviations from the specified thread parameters and take corrective actions to ensure product quality and reliability.

In summary, thread setting plugs complement the use of ring gages by providing a means to inspect the internal threads of threaded parts. Together, they form a comprehensive inspection system for verifying the dimensional accuracy and quality of threaded components according to industry standards such as ASME B1.1 or ASME B1.2.

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