KURODA's Thread Gauges specified in the API (American Petroleum Institute) and Premium Connection Gauges have been receiving the highest quality reputation not only in Japan but also throughout the world. KURODA acquired the licence of API Official Monogram for the API Thread Gauges in 1957.
KURODA supplies various Thread Gauges, such as special thread form gauges, or big diameter gauges as large as 20"(508mm). Consult KURODA or our agent. We suggest the best solutions for our customers, providing our skills and long experiences.
  • KURODA has developed right-weight API Thread Gauges through 6 5?8 to 20'' since 1975, when only KURODA could supply such right weight gauges.
  • KURODA puts a Limit-plate or Notch on the Working Thread Ring Gauge for the Spec. 5B except Ex. Li. Csg. For customers to easily identify the maximum tolerance.
  • KURODA also supply Special Thread Gauges other than API Standards.