JO-PLUG® tapped hole location gage.
The Precision JO-PLUG® true position locator remains the best gage on the market for determining true position, perpendicularity, and projected tolerance zone of threaded holes or tapped hole in conjunction with a CMM
Their solid thread form assures that the JO-PLUG® pitch diameter is calibrated, (front and back), using the universal three-wire method. ANSI/ASME Y14.5 M -1994, (R’99), Dimensioning and Tolerancing, states that “each tolerance of orientation and datum reference specified for a screw thread applies to the axis of the thread derived from the pitch cylinder.
The JO-PLUG® pitch diameter is coaxial to the cylinder portion of the gage, which projects a greater cylindrical tolerance zone than any other standard center-line locator on the market.
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