Spi 23-165-4 Threaded Ring Gage Class 2A Go No Go

Product Description

The SPI 23-165-4 is a double-ring threaded ring gage designed to verify external thread conformance to Class 2A tolerance standards. It includes both a Go and a No Go ring in a single unit, allowing a technician to confirm that a threaded part both enters the Go ring and stops at the No Go ring. Manufactured from tool steel, this gage delivers the hardness and dimensional stability required for accurate, repeatable inspection work. It is calibrated to NIST standards, making it suitable for quality-control environments that require traceable measurement references.

This gage is used in machine shops, production floors, and inspection departments wherever Class 2A external thread verification is required. It is appropriate for incoming inspection, in-process checks, and final acceptance testing of threaded components. The double-ring design consolidates Go and No Go functionality into a compact tool, reducing the number of individual gages needed at a workstation.

Key Features

• Double-ring design combines Go and No Go functions in one tool
• Class 2A thread classification for standard external thread tolerances
• Tool steel construction for hardness and long service life
• Calibrated to NIST standards for traceable inspection results
• Compact form factor at 1.75 inches wide and 0.45 inches in length

Compatibility

Designed for inspection of external threads conforming to Class 2A tolerance specifications. Specific thread size compatibility is defined by the 23-165-4 product designation; verify thread size and pitch against your application before ordering.

Installation Notes

Threaded ring gages are used by machinists and quality-control inspectors and do not require installation in a mechanical system. Store the gage in its protective case when not in use to prevent damage to the thread form. Clean threads on both the gage and the part before use to ensure accurate results. Periodic recalibration is recommended to maintain NIST-traceable accuracy over the service life of the gage.