Our Helicoil Taperlock Thread Plug Gages, or Screw Thread Insert (STI) Gages (Made in the USA) are manufactured to an “X” tolerance and are made of oil hardened tool steel. Helicoil plug gages are used to inspect the hole prior to inserting a screw thread insert when repairing a threaded hole. The metric STI gages can be class 4H5H (most commonly ordered) or 5H. We default to class 4H5H.
View description and pricing for helicoil taperlock gages. (pdf)
We can certify our gages to meet or exceed all published specifications and are traceable to the NIST (National Institute of Standards and Technology), and in compliance with (ISO) 10012-1 and ANSI/NCSL Z540-1. Uncertainties have been estimated at a 95% confidence level (K=2). Environmental controls are monitored to maintain 68 degree F and 50% maximum humidity. When necessary we offer ISO 17025, A2LA Calibrations through our 3rd party laboratories.