Spi 37-152-6 Plug Thread Gage M8x1.25 6H Class No Go

Product Description

The SPI 37-152-6 is a single-end plug thread gage designed to verify M8x1.25 internal threads to the 6H tolerance class using the No Go inspection method. When a threaded feature accepts the No Go member, the thread is out of tolerance and the part should be rejected. This gage is used by machinists, quality inspectors, and manufacturing technicians to confirm that tapped holes meet dimensional requirements before assembly. The gage body is compact and lightweight at 0.11 pounds, making it easy to handle in production and inspection environments. A handle is not included and must be sourced separately.

This plug thread gage is suited for production floor inspection, incoming quality control, and first-article verification wherever M8x1.25 metric threads are specified. It is particularly common in machining shops, assembly lines, and fabrication facilities working to metric fastener standards. The No Go function is used as a rejection check, confirming the lower material condition of the threaded hole. This gage conforms to ANSI standards and is traceable to NIST, supporting documented inspection programs.

Key Features

• No Go inspection member verifies the lower material condition of M8x1.25 internal threads
• 6H tolerance class meets standard metric thread fit requirements for general fastening applications
• ANSI-standard traceability certification included, with calibration traceable to NIST
• Single-end design for dedicated No Go inspection — handle sold separately
• Compact form factor: 1.31 inches in length, 0.31 inches in width, 0.31 inches in height
• Lightweight at 0.11 pounds for easy bench or floor use

Compatibility

Designed for inspecting M8x1.25 metric internal threads classified to the 6H tolerance standard. Compatible with standard adjustable thread gage handles sold separately.

Installation Notes

Thread plug gages are used by quality control technicians and machinists and require no power or special tooling beyond a compatible handle. Do not force the No Go member into a threaded hole — hand pressure only should be applied during inspection. Store gages in a protective case away from abrasive materials and temperature extremes to preserve calibration. Periodic re-calibration is recommended per your facility quality management system.