
JO-PLUGS® are manufactured to the minimum pitch diameter of the internal thread, with a tight minus tolerance, giving Precision JO-PLUG® centerline location plugs a measurable pitch diameter.
This is essential in establishing a cylindrical axis which is coaxial to the stem of the JO-PLUG® which is probed using a CMM in the established projected tolerance zone.
The standard Precision JO-PLUG® design is best utilized when a machined surface, perpendicular to the tapped hole, acts as a seating surface. Upward pressure on the thread flanks, which are also held to a tight tolerance, align the Precision JO-PLUG® to the center of the threaded hole.
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