Taper Measurements-External Taper Gauges
Tapered threads are a signature feature of API Tubing & Casing connections. Measuring thread taper is not only an industry wide practice, it is an API Specification 5B mandated inspection. During the manufacturing process, taper must be accurately measured and quantified to stay within the required specification limits. When subjected to a service load, taper error on threaded tubing and casing connections can lead to galling, improper fit, and reduced performance.
External taper gages inspect variation in external thread taper. Unless specified otherwise, external taper gages are shipped with .072” diameter contact points (CP072) as standard. Each internal gage requires two contact points. Higher resolution indicators are available. Contact points are sold individually.
| P/N | Model | Measuring Range | Travel | Resolution |
| ETG0010 | JZW1 | 0~10 in, External Taper | 0～0.5in | 0.001in |
| ETG0816 | JZW2 | 8～16 in , External Taper | 0～0.5in | 0.001in |
| ETG0820 | JZW3 | 8～20 in , External Taper | 0～0.5in | 0.001in |
| ETG1405 | JZW4 | 1～4 1/2in , External Taper | 0～0.5in | 0.001in |
| ETG1129-RSC | JZW5 | 1-1/2″~9″, External Taper | 0～1 in | 0.0005in |
For more information click the links below:
Oil Pipe External Thread Taper Gauges
Oil Pipe Internal Thread Taper Gages
How do you use an internal thread taper gauge?