Spi 37-169-0 Plug Thread Gage M27x3 6H No Go

Product Description

The SPI 37-169-0 is a single-end plug thread gage designed to perform No Go functional checks on M27x3 internal threads classified to the 6H tolerance standard. Used by machinists, quality control inspectors, and manufacturing technicians, this gage verifies that a threaded hole has not been cut undersize or left with insufficient clearance. The No Go member, when properly applied, should not pass through a conforming thread. At 0.441 pounds and measuring 1.81 inches in length with a 1.06-inch width and 1.06-inch height, the gage is compact and suited for bench or floor inspection use. A handle is not included and must be sourced separately.

This gage is applied in precision manufacturing, aerospace, automotive, and industrial maintenance environments wherever M27x3 metric threaded bores require dimensional verification against 6H class tolerances. It is appropriate for use in both incoming inspection and in-process quality checks. Traceability certification is provided to ANSI standards, with calibration traceable to NIST, making it suitable for documented quality systems and ISO-compliant inspection programs.

Key Features

• No Go member for M27x3 metric thread verification
• 6H tolerance class for standard internal thread fit inspection
• Single-end design for straightforward, dedicated No Go checks
• ANSI traceability certification included, calibrated to NIST standards
• Lightweight at 0.441 pounds for easy handling during inspection
• Handle not included — compatible with standard plug gage handles sold separately

Compatibility

Designed for use on M27x3 internally threaded components requiring No Go inspection to 6H class tolerances. A separate gage handle is required for operation and is not supplied with this gage.

Installation Notes

Plug thread gages are used by quality inspectors and machinists and do not require permanent installation. Before use, ensure the threaded bore is clean and free of chips, cutting fluid, or debris that could affect gage accuracy. Apply the No Go member by hand with light axial pressure only — never force or torque the gage into the thread. Store the gage in its protective case when not in use to maintain calibration integrity.