Vermont Gage 361126020 Threaded Ring Gage 1/4-20 Unc

Product Description

The VERMONT GAGE 361126020 is a Go-type threaded ring gage used to verify the maximum material condition of external threads. Machined from tool steel, this single-ring gage is built to NIST standards and checks 1/4-20 UNC threads at a Class 3A tolerance — the tightest commercial thread class, used where fit and function are critical. If the gage passes over the threaded part without interference, the thread meets the Go condition. Machinists, quality technicians, and tool-room inspectors rely on this type of gage for in-process and final inspection of male-threaded fasteners, shafts, and fittings.

This gage is suited for production inspection environments and job-shop quality control where 1/4-20 UNC external threads must be held to Class 3A tolerances. Typical applications include inspection of threaded fasteners, machined components, and fittings in manufacturing, aerospace, and general industrial settings. The single-ring design handles the Go function only, so it is typically paired with a separate No-Go ring gage to complete a full thread acceptance check.

Key Features

• Go-type single ring gage verifies the maximum material condition on 1/4-20 UNC external threads
• Class 3A tolerance — suitable for close-tolerance, high-fit-accuracy applications
• Tool steel construction for durability and wear resistance in production use
• Manufactured and calibrated to NIST standards for traceable measurement accuracy
• Single-ring format for dedicated Go-function inspection

Compatibility

Designed for inspection of external 1/4-20 UNC Class 3A threads on machined parts, fasteners, and threaded fittings in accordance with unified inch thread standards.

Installation Notes

Threaded ring gages are used by quality technicians and machinists — no installation in a mechanical system is required. Store the gage in a clean, dry environment away from coolants and abrasive debris to preserve calibration. Handle with care to avoid dropping, which can alter the internal thread geometry and void calibration. Periodically re-calibrate against NIST-traceable masters according to your quality management system requirements.