Vermont Gage 361129510 Threaded Ring Gage 5/16-18 Unc

Product Description

The VERMONT GAGE 361129510 is a Go-class threaded ring gage used to verify the maximum material condition of external threads. Manufactured from tool steel, this single-ring gage checks 5/16-18 UNC Class 2A threads to confirm they meet dimensional tolerance and will assemble correctly with a mating part. Thread ring gages are a standard tool in quality control, inspection, and production environments where external thread acceptance must be documented. This gage is calibrated to NIST-traceable standards, making it suitable for shops that require traceable measurement records.

This gage is designed for use with 5/16-18 UNC fasteners and threaded components classified to Class 2A tolerance. Class 2A is the most common tolerance class for general-purpose commercial fasteners, including bolts, studs, and screws used in mechanical assembly across manufacturing, MRO, aerospace, and industrial applications. It is used by quality inspectors, machinists, and tool room technicians as part of a Go/No-Go inspection process to accept or reject threaded workpieces before assembly.

Key Features

• Go-class ring gage confirms external threads meet maximum material condition for Class 2A fit
• 5/16-18 UNC thread form for inspection of common inch-series fasteners
• Single-ring design for dedicated Go-only inspection workflows
• Tool steel construction for durability and wear resistance in production environments
• Calibrated to NIST-traceable standards for quality documentation requirements

Compatibility

Designed for inspection of external 5/16-18 UNC Class 2A threaded components including bolts, studs, and screws in general-purpose mechanical assembly applications.

Installation Notes

Thread ring gages are handled and used by quality inspectors and machinist personnel, not installed in a system. Store the gage in its case when not in use to prevent damage to the thread form. Do not force the gage onto a thread — if it does not pass freely, the part does not meet Go tolerance and should not be accepted. Periodic recalibration against NIST-traceable masters is recommended to maintain inspection accuracy.