Spi 37-128-6 Plug Thread Gage M24x3 6H Class Go

Product Description

The SPI 37-128-6 is a single-end Go plug thread gage designed to verify internal M24x3 threads to the 6H tolerance class. The Go member checks that a threaded hole falls within the low limit of the tolerance range, confirming the thread will accept a mating fastener. This gage is manufactured to ANSI standards with traceability to NIST, making it suitable for use in quality control environments where documented calibration traceability is required. The gage body measures approximately 2.19 inches in length and 0.94 inches in diameter and weighs 0.441 pounds. A handle is not included and must be sourced separately to match the gage shank size.

This plug thread gage is used in manufacturing, machining, and inspection environments to check M24x3 tapped holes in metallic and non-metallic components. It is appropriate for both production floor and receiving inspection applications. Machinists, quality technicians, and tool crib personnel typically use this gage as part of a Go/No-Go verification process on parts machined to metric thread specifications. The single-end configuration keeps the gage compact and is well suited to high-volume inspection routines where a separate No-Go gage is already part of the inspection set.

Key Features

• Go member checks M24x3 internal threads to 6H class tolerance
• Single-end design for straightforward Go-only inspection workflows
• ANSI standard compliance with NIST traceability certification included
• Compact form factor: 2.19 inches long, 0.94 inches in diameter
• Lightweight at 0.441 pounds for comfortable hand use during inspection
• Handle not included — compatible with standard plug gage handles for the appropriate shank size

Compatibility

Designed for use with standard plug gage handles sized to accept the shank of this gage. Verifies internal M24x3 threads classified to the 6H tolerance standard. Intended for use in metric thread inspection programs where ANSI and NIST-traceable gaging is specified.

Installation Notes

Plug thread gages should be inserted by hand without power tools or excessive force. Before use, ensure the threaded hole is clean and free of chips, coolant, or debris that could damage the gage or produce a false reading. Gage handling and storage practices should follow your facility quality procedures to protect the precision ground surfaces. Calibration intervals should be established based on frequency of use and applicable quality system requirements such as ISO 9001 or AS9100.