• Linking Industry Together Since 1987


The roots of Glastonbury-Southern Gage began in 1962 when Glastonbury gage opened as a manufacturer of plain cylindrical plug and ring gages serving the aircraft, aerospace and automotive markets. Known for their reputation to produce to very exacting tolerance requirements, the company grew quickly to become the premier manufacturer of fixed limit gages, Part Master gages and special shapes masters in the USA. Wishing to continue their growth with quality products and services, Glastonbury Gage purchased the assets of the Southern Gage, the leading thread gage maker, in 1995. Founded in 1954, Southern Gage leads the industry with quality products and innovation. Southern Gage built their quality reputation by producing the highest quality thread gaging products and the ability to manufacture all types of gage products for both internal and external gaging applications. As a result of combining Southern Gage manufacturers a complete line of variable lint gaging systems, zero spindle fixture gaging systems and electronic comparator systems. The newest product offerings include ”Hi-Lo” style setting masters, BSP “full form” British standard pipe thread gages, API gages and special service such as “Redline Delivery”… When you need it fast! Glastonbury-Southern Gage continues to serve the automotive, aerospace, medical, off-road equipment, diesel engine, valve manufacturing, nuclear, fastener and industrial distribution industries. Glastonbury-Southern Gage is positioned to serve industry’s gaging requirements into the twenty-first century.

Product Picture

Product Highlights:

  • API Working Gages
  • Cylindrical Gages
  • Master & Pipe Gages
  • Thread Plugs & Ring Gages
  • Surveillance Masters
  • Zero Spindles


GSG Price Book

While we strive to keep this web site up-to-date, certain changes in product offering, options, and pricing may not be immediately reflected on this site. The FactoryLink reserves the right to change product specifications at any time without incurring obligations.

Mission Statement

Our mission is to simply be the best professional sales organization to do business with. We will achieve this by exceeding all expectations as measured by our clients, distributor partners and the manufacturers we proudly represent.


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