Spi 23-163-9 Threaded Ring Gage 3/8-16 Class 2A Go No Go

Product Description

The SPI 23-163-9 is a double-ring threaded ring gage used to verify the dimensional acceptability of external 3/8-16 UNC threads to Class 2A tolerances. It includes both a Go ring and a No Go ring in a single double-ring configuration, allowing technicians to confirm that a threaded workpiece falls within the acceptable tolerance range without requiring two separate gages. Constructed from tool steel for wear resistance and dimensional stability, the gage meets NIST traceability standards and ships with a NIST traceability certification. Machinists, quality control inspectors, and precision tradespeople use this gage in production and inspection environments where thread fit verification is required.

This gage is suited for inspecting bolts, studs, screws, and other externally threaded fasteners with 3/8-16 UNC thread forms held to Class 2A fit requirements. Class 2A is the most common tolerance class for general-purpose fasteners in commercial and industrial applications. The double-ring format streamlines the inspection process, making it practical for both shop-floor use and receiving inspection workflows.

Key Features

• Go and No Go rings combined in a single double-ring body for efficient thread inspection
• Thread size: 3/8-16 UNC at Class 2A tolerance classification
• Tool steel construction provides durability and resistance to wear in production environments
• NIST traceability certification included for compliance with quality system requirements
• Compact form factor at approximately 1.75 inches wide and 0.45 inches in length

Compatibility

Designed for inspection of externally threaded components with 3/8-16 UNC thread forms manufactured to Class 2A tolerance specifications.

Installation Notes

Thread ring gages are precision inspection tools and should be handled and stored carefully to prevent damage to the gage threads. Keep the gage clean and lightly oiled when not in use to prevent corrosion. Do not force the gage onto a workpiece thread; resistance beyond normal hand engagement indicates the thread is out of tolerance. Periodic calibration against certified setting plugs is recommended to maintain measurement accuracy.