PRECISION KURODA GAUGES
API THREAD GAUGES

PREMIUM CONNECTION GAUGES

THREAD MEASURING INSTRUMENTS
PRECISION KURODA API GAUGES
KURODA's Thread Gauges specified in the API (American Petroleum Institute) and Premium Connection Gauges used in the same field have been receiving the highest quality reputation not only in Japan, but also worldwide.

KURODA supply all the kinds of Thread Gauges listed in the API Spec. 5B, 7 and 11B. KURODA also supply a Thread Gauge having a special thread form, or a big one in diameter as large as 20" (508 mm).

PREMIUM CONNECTION GAUGES
Special pipes made of pressure resistant, high tensile strength and corrosion resistant materials have been developed for the use at deep well, extreme cold region, and/or natural gas digging, utilizing special thread forms and seals together with precision thread cuttings in order to get superior gas tight connection and so on.

KURODA has been contributing the improvement of function and quality for these fields by supplying so many special Thread Gauges or Premium Connection Gauges including a whole gauge system.

KURODA also supply Special Thread Gauges made of extremely wear resistant material with no plating/coating on the surface, because plating/coating cause flaking very often and such flaking may happen malfunction in measurement. KURODA is the pioneer utilizing such special wear resistant material as the gauge.

KURODA's these Premium Connection Gauges are being used not just in Japan, but in the world; America, Europe, Asia, China and so on.

THREAD MEASURING INSTRUMENTAS
TAPER MEASUREMENT LEAD MEASUREMENT HEIGHT MEASUREMENT
External-thread taper caliper. Lead gauge for external threads and for internal threads in size 4-in. nominal (4 1/2-in. OD) and larger. Thread-height gauge for external threads and internal threads in sizes 3-in. nominal (3 1/2-in. OD) and larger.
Internal thread taper gauge for threads in sizes 4-in. nominal (4 1/2-in. OD) and larger. Lead gauge for internal threads in sizes smaller than 4-in. nominal (4 1/2-in. OD). Thread-height gauge for internal threads in sizes smaller than 3-in. nominal (3 1/2-in. OD).
Internal-thread taper caliper for threads in sizes smaller than 4-in. nominal (4 1/2-in. OD). 3-dial gauge instrument for checking internal buttress threads. 3-dial gauge instrument for checking external buttress threads.