Vermont Gage 361158040 Threaded Ring Gage 7/8-14 Unf

Product Description

The VERMONT GAGE 361158040 is a No Go threaded ring gage used to verify that external threads do not exceed maximum material condition limits. Manufactured from tool steel, this single-ring gage is built to hold tight dimensional tolerances through repeated shop-floor use. It checks 7/8-14 UNF (Unified National Fine) thread forms to Class 3A tolerance specifications, making it the correct tool when close-fitting, high-precision thread verification is required. Licensed inspectors, machinists, and quality control technicians use No Go ring gages as part of a Go/No Go inspection pair to confirm that a threaded part will not assemble incorrectly due to oversized threads.

This gage is suited for inspection stations, production lines, and tool rooms where 7/8-14 UNF external threads must be held to Class 3A fit standards. Class 3A represents a tight tolerance class commonly specified for fasteners and precision assemblies in aerospace, automotive, and industrial applications. The No Go member of the gage set confirms the upper limit of thread tolerance is not exceeded. It is used by machinists and quality technicians working with precision threaded components requiring NIST-traceable verification.

Key Features

• No Go ring gage confirms external threads do not exceed Class 3A maximum material limits
• Thread size 7/8-14 UNF for Unified National Fine thread form
• Single-ring design for dedicated No Go inspection function
• Tool steel construction provides hardness and wear resistance for production use
• Manufactured to NIST standards for traceable dimensional accuracy

Compatibility

Designed for use with 7/8-14 UNF externally threaded parts requiring Class 3A tolerance verification. Intended for use as the No Go member of a Go/No Go ring gage inspection set.

Installation Notes

Threaded ring gages are handled and used by machinists and quality control technicians — not installed into a system. Before use, ensure the gage and the part being inspected are clean and free of burrs, chips, or debris that could cause a false reading. Store ring gages in a protective case away from impacts and temperature extremes to preserve calibration. Follow your facility gauge control program for calibration intervals in accordance with applicable quality management standards.