Tapered Thread Plug Gages Instrument Information
A metallic cylinder, containing a handle, machined to a precise diameter and taper and threaded to a precise size, with the threads removed and machined flat towards the back portion of the gage. The gage is screwed into the internal thread of a tapered machined part. The machined thread is considered in tolerance if the flat notch is within one turn (plus or minus) from being flush with the end of the thread.
Common Uses
- Verifying internal threads on things such as pipes and tubing.
Common Types
- NPT (National Pipe Thread – Tapered)
- NPTF (National Pipe Thread Fuel)
- BSPT (British Standard Pipe Thread – Tapered)
- ISO (International Organization for Standardization)
- JIS (Japanese Industrial Standard)
Measurement Parameter
- Inside Diameter (in, cm)
- Threading
Gage Type
- Attribute
Calibration Discipline
Calibration Equipment Used
- Universal Linear Measuring (ULM) System
