(586) 758-3800

Spence Industries Inc.

23888 DEQUINDRE - WARREN, MI 48091-1823 USA

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 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®

 Three easy ways to order:

  • Shop online now using our secure site 
  • Call (586) 758-3800 to order by phone using major credit cards
  • Call or e-mail to set up an account


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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. 

Contact us or Request a Quotation

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Spence Industries, Inc.

23888 Dequindre - Warren, MI 48091-1823

(586) 758-3800