Spi 34-193-3 Plug Thread Gage 0-80 2B Class Go

Product Description

The SPI 34-193-3 is a single-end Go plug thread gage used to verify internal thread conformance on 0-80 unified fine (UNF) threaded holes. Classified to 2B tolerance, it checks that a tapped hole accepts a mating fastener within the accepted limits for standard fit. Manufactured from steel for dimensional stability under shop conditions, this gage is an essential inspection tool for machinists, toolroom technicians, and quality control personnel working with miniature fastener threads. NIST traceability certification is included, supporting documented inspection processes and calibration records. A size 000 handle is required for use but is sold separately.

The 34-193-3 is suited for incoming inspection, in-process verification, and final inspection of 0-80 threaded features in precision components. Typical applications include aerospace hardware, optical instrument assemblies, electronics enclosures, and any manufactured part using miniature unified threaded fasteners. The Go member confirms the hole will accept a conforming mating thread without interference.

Key Features

• Go member checks that 0-80 2B tapped holes fall within acceptable minimum material limits
• Steel construction provides durability and dimensional stability for repeated use
• NIST traceability certification included for calibration documentation and quality compliance
• Meets ANSI and NIST standards for thread gage classification
• Single-end design for dedicated Go inspection — pair with a No-Go gage for full limit checking
• Compatible with size 000 gage handles (handle not included)

Compatibility

Designed for use with size 000 plug thread gage handles to inspect 0-80 UNF internal threads classified to 2B tolerance. Handle is not included and must be sourced separately.

Installation Notes

Plug thread gages are handled and used by quality control technicians and machinists — no power tools or utilities need to be shut down for inspection use. Keep the gage clean and lightly oiled when stored to prevent corrosion and protect thread form accuracy. Do not force the Go member into a hole that resists entry, as this can damage the gage or the workpiece. Follow your facility calibration schedule and reference the included NIST traceability certificate to maintain measurement integrity.