Spi 37-178-1 Plug Thread Gage M1.6x0.35 6H Double End

Product Description

The SPI 37-178-1 is a double-end plug thread gage designed to inspect M1.6x0.35 metric threads to 6H tolerance class. One end carries the Go member and the opposite end carries the No Go member, allowing technicians to verify both the minimum and maximum thread tolerance limits in a single tool. A handle is included. At 0.11 pounds and measuring 2.42 inches in length with a 0.31-inch diameter profile, this is a compact, precision inspection instrument suited for quality control work on small-diameter threaded fasteners and components. Traceability certification to ANSI standards with NIST traceability is included with the gage.

This gage is used in manufacturing, machining, and assembly environments where M1.6x0.35 internal threads must be verified for conformance before parts advance to the next production stage. It is appropriate for inspection of tapped holes in small precision components such as instrument housings, electronics hardware, and miniature mechanical assemblies. The 6H tolerance class corresponds to a medium-fit internal thread, the most common classification for general-purpose metric fastener applications. Quality technicians, machinists, and metrologists are the primary users.

Key Features

• Double-end design: Go member on one end, No Go member on the other for single-tool tolerance verification
• M1.6x0.35 thread size with 6H tolerance class for medium-fit internal thread inspection
• ANSI traceability certification with NIST reference included
• Handle included — no separate purchase required
• Compact form factor at 2.42 inches length and 0.11 pounds

Compatibility

Designed for inspection of M1.6x0.35 internal threads classified to 6H tolerance per applicable ANSI and ISO metric thread standards.

Installation Notes

Plug thread gages are used by quality control technicians and machinists and require no installation in the traditional sense. Before gauging, ensure the threaded hole is clean and free of chips, cutting fluid residue, or debris that could give a false reading. Apply light, consistent hand pressure when inserting the Go and No Go members — never force the gage. Store the gage in its case when not in use to protect the precision ground threads from damage.