Spi 23-209-0 Threaded Ring Gage 1-14 Class 2A Go No Go

Product Description

The SPI 23-209-0 is a double-ring threaded ring gage designed to verify external thread conformance on 1-14 unified thread form fasteners and components. It includes both a Go ring and a No Go ring in a single tool, allowing technicians to confirm that a threaded part falls within the acceptable tolerance range for Class 2A fit. The gage body is machined from tool steel for dimensional stability and wear resistance. NIST traceability certification is included, making this gage suitable for use in quality control environments where documented calibration standards are required.

This gage is used in manufacturing, maintenance, and inspection settings where external threads must be verified before assembly or acceptance. Class 2A is the standard tolerance class for general-purpose unified inch fasteners, covering the majority of commercial and industrial threaded components. Machinists, quality inspectors, and tool room technicians use Go/No Go ring gages as a fast, reliable method to accept or reject threaded parts without requiring a CMM or thread micrometer.

Key Features

• Go and No Go rings in a single double-ring gage for complete Class 2A external thread inspection
• Thread size: 1-14 unified thread form
• Tool steel construction for durability and long service life
• NIST traceability certification included for quality and compliance documentation
• Compact form factor suitable for bench inspection and in-process checks

Compatibility

Designed for inspection of external threads conforming to the 1-14 unified thread form at Class 2A tolerance. Verify thread specification against the part drawing before use.

Installation Notes

Threaded ring gages are handled and used by machinists and quality control inspectors — no power tools or utilities need to be shut off before use. Store the gage in its protective case when not in use to prevent damage to the precision ground threads. Do not force the gage onto a threaded part; if resistance is excessive, remove the part for further inspection rather than applying additional torque. Periodic recalibration against NIST-traceable masters is recommended to maintain measurement integrity.