STI UNC / UNF and EG M plug gages G-GR-LD are designed to inspect the pitch diameter and thread form for internal-thread components. All plug gages are available with a short form Certificate of Accuracy documentation.

  • Gage dimensions according to ANSI/ASME B 18.29.1, formerly  MS33537
  • Metric gages made to DIN 1502
  • Short form certificate is supplied at no additional charge
  • Long form certificate is available on request
  • Manufactured with hardened tool steel for durability
  • A cleansing channel is ground into the GO side to eliminate thread damage from dirt and grime on sizes above 1/4" or M 5.5
  • Gages have a recessed minor thread diameter for safe functionality
  • Knurled handle for maximum gripping ability and safety
  • NO-GO side is clearly marked with a Red ring
  • Gage handles have a double surface for marking leaving ample space for custom marking
  • Reduced thread start diameter construction for easy insertion

STI (EG) Products