Spi 34-331-9 Plug Thread Gage 1-8 6H Single End Go

Product Description

The SPI 34-331-9 is a single-end Go plug thread gage designed to verify internal thread conformance on 1-8 UNC threaded holes. Manufactured from steel and classified to 6H tolerance, it checks that threaded features fall within the acceptable dimensional range for fit and function. The Go member confirms that a mating fastener or component will assemble correctly without interference. This gage is used on the shop floor or in inspection environments where thread quality must be verified against ANSI standards. A size 4 handle is required for use but is not included with this gage and must be sourced separately.

The 34-331-9 is suited for precision inspection applications in manufacturing, machining, and fabrication settings. It is used to inspect 1-8 UNC tapped holes in components across industries including mechanical assembly, structural fabrication, and general industrial production. The 6H classification makes it appropriate for standard-tolerance internal threads where controlled fit is required. Machinists, quality control technicians, and metrologists will encounter this gage in production inspection and first-article verification workflows.

Key Features

• Go member checks that internal 1-8 UNC threads are within minimum material condition limits
• 6H classification conforms to ANSI tolerance standards for internal threads
• Steel construction provides durability for repeated use in production inspection environments
• NIST traceability certification included for documented measurement traceability
• Single-end design for dedicated Go inspection without a No-Go member on the same shank
• Requires a size 4 gage handle, sold separately

Compatibility

Designed for use with standard size 4 plug gage handles. Compatible with inspection of 1-8 UNC internally threaded components requiring 6H class tolerance verification per ANSI standards.

Installation Notes

This gage is used by machinists or quality technicians — no power tools or electrical shutoff is required. Handle must be properly seated and secured before use to avoid damage to the gage or the workpiece threads. Do not force the Go member into a thread; smooth hand engagement is expected on a conforming hole. Follow ANSI B1.2 gaging practices and maintain gage calibration intervals per your quality management system requirements.