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Precision JO-PLUG® threaded hole location gages are available in ASME, ISO and HELI-COIL® thread forms with pitch cylinders parallel to gaging diameter.

Precision JO-PLUG® CMM thread location gages are available in our online store from stock in Unified, Metric, and Heli-Coil thread sizes for immediate delivery.

Customer-designed Precision JO-PLUG set
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unified series - full set
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Extended projected tolerance zones, tapped holes below counterbores, tapered pitch diameters for irregular surfaces, UNEF, and other non-common thread forms are examples of custom JO-PLUGS® manufactured for unique applications.

  • C of C traceable to NIST and ISO/IEC 17025:2018 and ANSI/NCSL Z540-1-1994 Accreditation at no charge
  • Unified Series pitch diameters are “Go Basic,” suitable for Classes 2B and 3B
  • Fast delivery: Unified, Metric and Heli-Coil® series true position locators
  • Quick turn-around on custom manufacture JO-PLUGS®

Spence Industries, Inc. is engaged in the manufacture of Precision JO-PLUG® tapped hole location gages since 1956. Our repeat and satisfied customers are the leaders and best in meeting American and international quality standards. Customers in the aerospace, automotive, defense, electronic, and medical device industries benefit from our fast and accurate method of determining positional tolerance of threaded holes with repeatability and reproducibility.

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Spence Industries, Inc. is proud to be enrolled assisting United States government facilities make exceptional products.

Please use this form to request information or call our HOTLINE (586) 758-3800 for immediate assistance. We will be glad to answer questions on in-stock items or offer our expertise with unique inspection requirements.

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