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API Oil Country Gage


PMC Lonestar is licensed by API to Spec Q1, Spec 5B, 7 & 11B and manufactures a complete line of API (American Petroleum Institute) plug and ring gages for

  • Casing - sizes 4 ½" - 20", both working & masters
  • Line Pipe - sizes 1/8" - 20D, both working & masters
  • Tubing - EUT 2 3/8" - 4 ½", both working & masters, NUT 2 3/8" - 4 ½", both working & masters
  • Buttress Casing - sizes 4 ½" - 20", both working & masters
  • Improved Buttress Tubing - sizes 2" - 5 ½", both working & masters
  • Sucker Rod - masters P1-P8 & B1-B6, working gages P2-P8 & B2-B6
  • Polished Sucker Rod
  • Rotary Shouldered - NC10-NC77, both working & masters
  • Regular Rotary - sizes 2 3/8" - 8 5/8", both working & masters
  • Full Hole - sizes 3 ½" - 6 5/8", both working & masters
  • Internal Flush - sizes 2 3/8" - 5 ½", both working & masters
  • Extreme Line Gages - contact for current pricing
  • Negative Flank Angle – we have recently introduced fixed and ground negative flank angle gages to our product line.

Field proven for over half a century, our master and working gages meet and exceed specifications established by the American Petroleum Institute and are used as the benchmark for calibration by the National Institute of Standards and Technology (NIST). PMC Lonestar designs and manufactures special oil country gages to your specifications.

Contact us for current pricing and availability.