Vermont Gage 361127040 Threaded Ring Gage 1/4-28 Unf 3A No Go

Product Description

The VERMONT GAGE 361127040 is a single-ring threaded ring gage used to verify the dimensional conformance of externally threaded parts. Classified as a No Go gage to the Class 3A tolerance standard, it checks that a mating thread does not exceed the maximum material condition limit. The gage is manufactured from tool steel for wear resistance and dimensional stability under repeated use. It conforms to NIST standards, making it suitable for quality-control applications where traceability and accuracy are required. Machinists, tool-room technicians, and quality inspectors use this gage during production inspection and incoming parts verification.

This gage is designed for inspecting 1/4-28 UNF external threads to Class 3A tolerance, which represents a close-tolerance fit commonly specified in precision mechanical assemblies, aerospace fastener applications, and instrumentation. A No Go gage is applied after the Go gage check: if the No Go ring assembles onto the threaded workpiece, the part is out of tolerance and must be rejected. This single-ring design is intended for bench inspection or in-line quality checks in machine shops and manufacturing environments.

Key Features

• No Go classification confirms maximum material condition rejection for Class 3A external threads
• 1/4-28 UNF thread size covers a widely used fine-thread fastener specification
• Tool steel construction provides durability and resistance to wear over extended inspection use
• Single-ring design allows direct, unambiguous pass-fail gauging
• Conforms to NIST standards for traceability in calibrated inspection environments

Compatibility

Designed for inspection of 1/4-28 UNF externally threaded workpieces held to Class 3A tolerance. Intended for use as the No Go member of a Go/No Go gage set for this thread specification.

Installation Notes

Threaded ring gages are used by quality inspectors and machinists and require no permanent installation. Store the gage in its protective case when not in use to prevent damage to the thread form. Calibrate or re-certify the gage periodically per your facility's quality management system requirements. Do not force the gage onto a workpiece thread; applied force can damage the gage and produce false readings.