Spi 23-119-1 Threaded Ring Gage 2-56 Class 2A Go No Go

Product Description

The SPI 23-119-1 is a double-ring threaded ring gage used to verify external thread dimensions on No. 2-56 unified coarse fasteners and threaded components. It includes both a Go ring and a No Go ring in a single tool, allowing machinists and quality control inspectors to confirm that male threads fall within the tolerances set by Class 2A specifications. The gage body is manufactured from tool steel for dimensional stability and resistance to wear under repeated use in production or inspection environments. At 0.27 inches in length and 1 inch in width, the tool is compact enough for bench or floor use across a range of shop settings.

This gage is suited for precision thread inspection in machining, manufacturing, and assembly operations where No. 2-56 externally threaded parts must meet Class 2A tolerance requirements. It is commonly used by machinists, quality technicians, and metrology lab personnel working with small-diameter fasteners in aerospace, electronics, and general manufacturing. The double-ring design allows Go and No Go checks to be performed with a single tool, reducing inspection time and the chance of gage mix-ups on the shop floor.

Key Features

• Double-ring design combines Go and No Go rings in one tool for efficient Class 2A external thread inspection
• Thread size No. 2-56 covers a common small-diameter unified coarse thread used in electronics and precision assemblies
• Tool steel construction provides hardness and wear resistance for long service life in production inspection
• NIST traceability certification included, supporting calibration records and quality system documentation
• Compact form factor at 0.27 inches length and 1 inch width suits benchtop and in-process inspection

Compatibility

Designed for inspection of externally threaded components with No. 2-56 unified coarse threads manufactured to Class 2A tolerance specifications.

Installation Notes

Thread ring gages are handled and stored by metrology and quality control personnel, not installed in a system. Before use, clean both the gage rings and the threaded workpiece to remove chips, oils, or debris that could affect measurement accuracy. Apply only hand pressure when engaging the gage with the workpiece thread — never force or use tools to turn the ring. Follow your facility calibration schedule and NIST traceability requirements to maintain measurement integrity.