Spi 37-153-4 Plug Thread Gage M10x1.25 6H No Go

Product Description

The SPI 37-153-4 is a single-end No Go plug thread gage designed to verify that an M10x1.25 internal thread does not exceed the maximum material condition of the 6H tolerance class. Machinists, quality control inspectors, and tool room technicians use this gage as part of a Go/No Go inspection routine to reject parts with oversized or out-of-tolerance threaded holes before assembly. At 0.039 pounds and measuring 1.37 inches in length with a 0.39-inch diameter head, it is a compact, hand-held instrument. The gage conforms to ANSI standards and is traceable to NIST, making it suitable for documented inspection processes.

This gage is used in production and inspection environments where M10x1.25 fine-pitch internal threads must meet 6H class tolerances. Typical applications include thread inspection on machined components in aerospace, automotive, general manufacturing, and maintenance shops. The No Go member is used alone to screen threads that are too loose or have been cut beyond the high limit of the tolerance band. Handle is not included and must be sourced separately for handheld use.

Key Features

• No Go member checks the maximum material limit of M10x1.25 6H internal threads
• Single-end design for dedicated No Go inspection tasks
• ANSI-conforming with NIST traceability for documented quality systems
• Compact profile at 1.37 inches long and 0.39-inch diameter for easy handling
• Lightweight at 0.044 pounds for extended inspection work
• Handle sold separately, compatible with standard plug gage handles

Compatibility

Designed for use with standard plug gage handles sized for M10x1.25 thread members. Intended to inspect internal threads conforming to the 6H tolerance class per ANSI standards.

Installation Notes

Thread gages are precision instruments and should be handled by qualified inspection or machining personnel. Do not force the No Go member into a thread; a properly formed 6H thread should resist full engagement of the No Go gage. Store in a protective case away from moisture and abrasive surfaces to maintain calibration. Periodic recalibration against NIST-traceable masters is recommended to preserve measurement integrity.