In Gage Threadcheck's Official Blog

16Jul/12Off

Gagemaker Ball Pitch Diameter Gages

Thread Check offers a wide range of pitch diameter gages manufactured by Gagemaker. These types of gages are commonly known as ball PD gages as they accurately measure pitch diameter which is one of the most important characteristics of a thread. Pitch diameter represent the widest spectrum of potential defects on a screw thread. Improperly sizes pitch diameters compromise the load capacity of your threaded components.

Gagemaker uses contact point (or contact ball) gages to inspect lead, taper, height, and pitch diameter on nearly any type of thread. Generally, these gages require two contact
points. Our points are inter-changeable; one set of points often can be used on different types of inspection gages. For best results, we still recommend one set of points for each gage.
Gagemaker offers spherical points and truncated points to measure pitch diameters. Truncated points as illustrated ensure contact on the flanks of the thread pitch line and eliminate the possibility of bottoming out on the root or minor diameter of the thread.

truncated points are used to measure pitch diameters of certain straight threads, primarily Acme, Stub Acme, and the modified Stub Acme threads.

Spherical points are commonly used for *UN Series, Metric, 7x45 Buttress, and nearly all tapered threads (tubing & casing and rotary shouldered connections).

Note: Remember when setting a gage with truncated points set on the truncated surface of the point. Gagemaker will provide set-to-flat value to compensate for the truncation.

http://www.threadcheck.com/gagemaker-thread-gages/

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