Spi 37-107-0 Plug Thread Gage M4x0.7 6H Single End Go

Product Description

The SPI 37-107-0 is a single-end Go plug thread gage sized for M4x0.7 metric threads to 6H tolerance class. Plug thread gages are precision inspection tools used to verify that an internally threaded feature — a tapped hole or nut — meets dimensional acceptance criteria. The Go member checks that the thread will accept a mating fastener across the full engagement length. This gage ships without a handle; a compatible separate handle is required for use. It is a standard tool for quality control inspectors, machinists, and tool room technicians working to metric thread standards.

This gage is suited for inspection of M4x0.7 tapped holes in manufacturing, machining, and assembly environments where 6H thread tolerance is the specified fit class. Typical applications include incoming inspection of machined components, in-process verification on the shop floor, and final quality audits. The compact size is appropriate for close-tolerance work on small fastener threads common in electronics, instrumentation, and precision mechanical assemblies.

Key Features

• Go member verifies minimum thread acceptance for M4x0.7 metric threads
• 6H tolerance class — standard commercial fit for metric internal threads
• Single-end configuration for dedicated Go inspection without ambiguity
• ANSI traceability certification included for documentation and audit compliance
• Calibrated to NIST-traceable standards
• Handle not included — compatible with standard interchangeable plug gage handles

Compatibility

Designed for use with standard interchangeable plug gage handles sized to accept small-diameter thread gage members; verify handle range compatibility before ordering. Intended for inspection of M4x0.7 internal threads to 6H class per applicable metric thread standards.

Installation Notes

Thread plug gages are inspection tools, not cutting tools — never force the Go member into a thread. Inspect gage members for wear or damage before each use and store in a protected case to prevent nicking the thread form. Handle should be selected based on gage diameter range per the manufacturer's handle sizing chart. Periodic recalibration against NIST-traceable masters is recommended to maintain accuracy and meet quality system requirements.