Spi 23-179-5 Threaded Ring Gage Class 2A Go No Go

Product Description

The SPI 23-179-5 is a double-ring threaded ring gage designed to verify external thread conformance to Class 2A tolerances using both Go and No Go members in a single tool. Machined from tool steel, it provides the hardness and dimensional stability required for repeatable shop-floor and inspection use. The Go ring checks that the thread falls within the minimum material condition, while the No Go ring confirms the thread does not exceed the maximum material condition. This gage is used by machinists, quality technicians, and tool-room inspectors who need a reliable, standards-traceable thread verification tool.

This gage is suited for inspecting externally threaded fasteners, fittings, and machined components where Class 2A thread tolerances are specified. The double-ring configuration houses both the Go and No Go members in one compact unit, making it practical for production-line inspection and receiving inspection alike. At 1.75 inches wide and 0.45 inches in length, it is sized for bench use or integration into a standard gage storage setup. Total weight is approximately 0.62 pounds.

Key Features

• Double-ring design combines Go and No Go members in one gage body
• Class 2A classification for standard external thread tolerance verification
• Tool steel construction for wear resistance and dimensional stability
• NIST-traceable standards compliance for audit-ready inspection records
• Compact form factor suitable for bench, line, or incoming inspection use

Compatibility

Designed as an OEM-style inspection gage for externally threaded parts manufactured to Class 2A thread tolerance specifications.

Installation Notes

Threaded ring gages are handled by quality technicians or machinists during inspection operations, not installed in a system. Store the gage in a clean, dry location away from direct contact with abrasive materials to preserve thread form accuracy. Apply a light coat of oil when the gage is not in use to prevent corrosion on tool steel surfaces. Calibration intervals should follow your facility quality plan and applicable metrology standards.