Spi 23-195-1 Threaded Ring Gage 3/4-16 Class 2A Go No Go

Product Description

The SPI 23-195-1 is a double-ring threaded ring gage designed to verify the external thread form and tolerance of 3/4-16 UNF fasteners and threaded components to Class 2A specifications. The set includes both a Go ring and a No Go ring in a single double-ring body, allowing technicians to confirm both the minimum and maximum thread tolerance limits in one tool. Constructed from tool steel for wear resistance and dimensional stability, this gage provides reliable pass/fail inspection results in production and quality-control environments. NIST traceability certification is included, supporting documented calibration requirements.

This gage is used in precision machining, manufacturing, and quality inspection applications where 3/4-16 UNF Class 2A external threads must be verified before assembly or shipment. It is suited for use on the shop floor, incoming inspection stations, or in calibration labs. Machinists, quality technicians, and metrology professionals use Go/No Go ring gages as a fast, definitive method to accept or reject threaded parts without requiring measurement of individual thread parameters.

Key Features

• Double-ring design includes both Go and No Go rings in one gage body
• Verifies 3/4-16 UNF external threads to Class 2A tolerance
• Tool steel construction for durability and dimensional stability
• NIST traceability certification included for calibration documentation
• Compact form factor supports bench and floor inspection use

Compatibility

Designed for inspection of 3/4-16 UNF Class 2A external threads on fasteners, fittings, and machined components conforming to that thread standard.

Installation Notes

Thread ring gages are precision metrology tools and should be handled by qualified inspection or machining personnel. Store the gage in a protective case away from impact, moisture, and temperature extremes to preserve calibration. Do not force the gage onto a thread — the No Go ring should not pass; if it does, the part is out of tolerance. Periodic recalibration against NIST-traceable masters is recommended to maintain measurement integrity.