What is a thread gage?
Fixed limit thread gages are designed to simply tell you if your threaded component is in or out of tolerance.
What is a thread plug gage?
Thread plug gages check the internal thread of a threaded part. The “Go” plug gage should enter the threaded part. The “Not Go” should not enter the part. This simple process confirms the part is in tolerance. This applies for both metric and American inch sizes.
How do I check an external thread on my part?
External threads are checked using thread ring gages. Thread ring gages may be solid or adjustable design. The “Go” thread ring should allow the external threaded part to enter. The “Not Go” thread ring should not allow the external threaded part to enter. This simple process confirms the part is in tolerance. This applies for both metric and American inch sizes.
Can I check an internal threaded hole with a thread setting plug?
No. A thread setting plug is used only to set thread ring gages of the same size and pitch diameter.