ANSI Y14.5 – 2009, Dimensioning and Tolerancing, Section 2.9, states that
“each tolerance of orientation and datum reference for a screw thread applies to the axis of the thread derived from the pitch cylinder."
The Positional Tolerance Method (Section 18.104.22.168) states that the pitch cylinder is the default condition. The JO-PLUG® solid thread form provides a calibrated pitch cylinder, coaxial and concentric to the spindle diameter of the JO-PLUG® .
Precision JO-PLUGS® provide positive results with repeatability and reproducibility to satisfied return customers in the most discerning Quality Labs.
Used in conjunction with a CMM or Laser Tracker, basic position and orientation are quickly and accurately established.
- C of C traceable to ISO/IEC 17025:2005 at no charge with every order
- Fast delivery: Unified, Metric and Heli-Coil® series threads
-Quick turn-around on custom manufacture JO-PLUGS®
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In addition to off-the-shelf Precision JO-PLUGS®, Spence Industries, Inc. specializes in the manufacture of custom gages for unique applications: extended projected tolerance zones, tapped holes below counter bores, tapered pitch diameter for irregular surfaces, and other particular customer requirements.
Precision JO-PLUG® pitch diameters are calibrated using a Pratt & Whitney Super Mic utilizing the universal "three wire method."
Precision JO-PLUG® "lead and trail" thread angles are verified using a J&L Metrology Optical Comparator.