Vermont Gage 361158020 Threaded Ring Gage 7/8-14 Unf

Product Description

The VERMONT GAGE 361158020 is a Go-class threaded ring gage manufactured from tool steel, designed to verify the maximum material condition of external threads. Used to confirm that a male-threaded part will assemble correctly with a mating component, this single-ring gage checks conformance to Class 3A tolerance limits on 7/8-14 UNF thread form. It is a precision inspection tool used by machinists, quality control technicians, and tool-and-die shops where tight thread tolerances must be verified before parts move to assembly. The go gage must pass completely over the threaded workpiece to confirm acceptance.

This gage is suited for inspection of 7/8-14 UNF external threads in both production and quality lab environments. The Class 3A designation applies to close-tolerance fastener applications common in aerospace, automotive, and precision mechanical assemblies where fit and function are critical. It is used as a single go-ring check alongside a separate no-go ring when full pass-fail thread verification is required.

Key Features

• Go classification confirms external thread is within maximum material condition limits
• 7/8-14 UNF thread form for unified national fine thread inspection
• Class 3A tolerance for close-fit, high-precision thread verification
• Single-ring design for dedicated go-check use
• Tool steel construction for wear resistance and dimensional stability
• Manufactured to NIST-traceable standards

Compatibility

Designed for inspection of 7/8-14 UNF Class 3A external threaded components. Verify that the workpiece thread specification matches this gage class and pitch before use.

Installation Notes

Threaded ring gages are used by quality control and machining personnel and require no permanent installation. Ensure the workpiece is clean and free of burrs, chips, or lubricant buildup before gaging. The go ring should pass over the thread under its own weight with minimal force. Do not force the gage onto an out-of-tolerance thread, as this can damage the gage and produce false readings.