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The SPI 37-115-3 is a single-end Go plug thread gage designed to verify internal M10x1.5 threads to 6H tolerance class. The Go member checks that a threaded hole accepts a mating fastener at the minimum material condition, confirming the thread form and pitch diameter fall within specification. This gage is used in production inspection and quality control environments where metric thread conformance must be verified before assembly. At 0.11 pounds and measuring 1.75 inches in length with a 0.39-inch diameter, it is compact enough for bench or inline inspection use. A separate handle is required and is not included with this gage.
This gage is suited for machinists, quality technicians, and inspection personnel working with M10x1.5 metric fastener threads in manufacturing, maintenance, and repair operations. The 6H classification is a standard fit tolerance widely specified for general-purpose metric threaded holes in steel, aluminum, and similar materials. Traceability certification is included per ANSI standards, with calibration traceable to NIST, making this gage appropriate for use in documented quality systems and ISO-compliant inspection processes.
Designed for use with standard plug gage handles sold separately; fits M10x1.5 single-end Go gage handle collets standard to this gage diameter. Verify handle collet size against the 0.39-inch gage body diameter before ordering a handle.
Plug thread gages are handled and used by quality technicians or machinists — no power tools or lockout procedures are required for gage use itself. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the thread form. Do not force the Go member into a threaded hole; entry should be smooth under hand pressure only. Store in a protective case away from impacts and temperature extremes to maintain calibration integrity.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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