Spi 23-201-7 Threaded Ring Gage 7/8-14 Class 2A Go No Go

Product Description

The SPI 23-201-7 is a double-ring threaded ring gage designed to inspect external threads to the 7/8-14 UNF thread standard at Class 2A tolerance. The set includes both a Go ring and a No Go ring in a single unit, allowing technicians to confirm that a threaded part falls within the acceptable tolerance band in one operation. Manufactured from tool steel, the gage provides the hardness and dimensional stability required for repeatable gauging in production and inspection environments. A NIST traceability certification is included, supporting quality system documentation requirements under ISO and similar standards.

This gage is suited for machine shops, manufacturing facilities, and maintenance operations where external thread verification is required. It is commonly used by machinists, quality control inspectors, and tool room technicians to validate threaded fasteners, studs, bolts, and other externally threaded components prior to assembly or shipment. The double-ring configuration eliminates the need to handle two separate gages, streamlining the inspection workflow at the bench or on the production floor.

Key Features

• Go and No Go rings combined in a single double-ring unit for efficient thread inspection
• Manufactured from tool steel for wear resistance and dimensional stability
• Calibrated to NIST-traceable standards with certification included
• Covers 7/8-14 UNF external thread at Class 2A tolerance
• Compact form factor suitable for bench and in-line inspection use

Compatibility

Designed for inspection of external 7/8-14 UNF threads conforming to Class 2A tolerance specifications. Verify thread form and tolerance class before use with any workpiece.

Installation Notes

Threaded ring gages are used by quality inspectors and machinists and require no permanent installation. Before use, ensure the gage and workpiece are clean and free of burrs, chips, or thread compound that could affect readings. Handle the gage with care to avoid dropping or impacting the precision-ground bores. Store in a protected case when not in use to maintain calibration integrity.