Gages

Thread Gages - Shop the Largest Selection of Thread Gauges Available

WESTport Corporation is pleased to be your trusted manufacturer and distributor for precision measuring instruments, including our complete line of thread gages. Our services are geared toward helping manufacturers who manufacture parts for the aerospace, automotive, medical, oil and pipeline, defense and ammunition and firearms industries.

If your company needs a specific or precise part to fit a certain tolerance, WESTport can help.

Thread Gage Options

Thread gauges are used to inspect functional thread and pitch diameter. They are also used to check pitch diameter limits and the outside and inside major diameter on threaded parts. They play an important role in failing or passing product threads during an inspection. If you need reliable precision measuring instruments such as a thread gage, trust the experts at WESTport Corporation to provide you with a thread gage that is manufactured to all national and international standards.

Some of the benefits and features of getting your thread gage through WESTport Corporation include:

Precision hand lapped and polished to ensure superior accuracy
American Gage Design (AGD) thread gages
ANSI B1.2, ANSI B1.16M, and ASME compliance
ASME/ANSI B47.1 gage blanks
NOGO and GO members
100% satisfaction guarantee
Free technical support
Free NIST certificate of accuracy

How to Use a Thread Gage Correctly

Using a thread gage requires careful handling to ensure accurate measurements. Begin by selecting the correct gage for your thread type—either "Go" or "No Go."

Go Gage: The Go gage should screw into the part without forcing. It checks the lower limit of the thread.
No Go Gage: Insert the No Go gage. If it engages more than a few turns, the thread is out of tolerance.
Always rotate the gage gently to prevent damage and ensure accuracy.

How Many Turns Can a No Go Thread Gage Go?

A "No Go" thread gage should not engage more than three turns into a properly threaded component. If the "No Go" gage enters beyond the specified limit, it indicates that the thread is oversized and does not meet the required standards. This simple test ensures that the manufactured thread fits within the tolerance limits for quality assurance.

How to Calculate Turns with a Thread Gage

When using a thread gage, place the No Go gage into the threaded hole or part. Count the number of rotations it makes before stopping. Typically, the gage should only turn up to three times before it reaches resistance. If the gage exceeds this number of turns, it signals that the thread dimensions are too large, potentially compromising the integrity of the connection.

How to Clean Thread Gages

To maintain precision and longevity, thread gages should be cleaned regularly. Use a soft-bristle brush to remove debris from the threads and follow up with a dry air blow to clear any remaining particles. For stubborn grime, apply a light solvent, but avoid harsh chemicals as they can corrode the metal over time.

How to Calibrate a Thread Gage

Regular calibration is crucial to ensure your thread gages remain accurate. To calibrate, use a certified master ring or set plug gage that is traceable to national or international standards. Compare the measurements against the master gage to check for discrepancies. Any deviation should be recorded, and the gage should be recalibrated accordingly.

WESTport Corporation offers a complete certified calibration service.