Plug & Ring Gauges

Riverhawk has designed a full range of plug & ring gauges developed specifically for rotating machinery used in the petrochemical industry. Our plug and ring gauges are supplied with a certification of calibration traceable to N.I.S.T. They meet or exceed all API 671 and ISO 10442 requirements.

Plug & Ring Gauges OverviewPlug & Ring Gauges

  • Full Range—Designed and machined to match machine shaft ends.
  • Taper Contact 90% to 95% guaranteed with bluing tapes provided.
  • Meets or Exceeds API 671 and ISO 10442 requirements.
  • Made from UNS860 Tool Steel, A6 Tool Steel or 440C Stainless Steel.
  • Minimum gauge hardness of 58 HRc. Double thermal stabilized for longevity.
  • Calibration, Certification and Storage services available.
  • Lapping Tools Provided
    • Full coverage of mating & female tapers.
    • Can be machined matched to existing tapers.
    • Guaranteed minimum of 90% taper contact with confirming bluing tapes supplied with certification report.

We offer a variety of standard and custom-designed hydraulic coupling installation equipment options, including:



To learn more about Riverhawk’s Plug and Ring Gauges contact a member of our team. We will be more than happy to assist you with your project needs.

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