Spi 23-172-0 Truncated Taperlock Thread Plug Gage 7/16-20 Unf

Product Description

The SPI 23-172-0 is a truncated taperlock thread plug gage designed to verify internal thread conformance on 7/16-20 UNF fastener applications. It includes both Go and No Go members in a single Class 2A gage set, allowing technicians to confirm that threaded holes fall within the accepted tolerance range without additional tooling. The gage is constructed from tool steel for wear resistance and dimensional stability under repeated use. The taperlock design locks gage members securely into the 2-inch handle, preventing shifting during inspection. This type of gage is standard equipment in precision machining, manufacturing QC, and maintenance environments where threaded fastener integrity must be verified to specification.

This gage is suited for inspecting UNF fine-thread holes produced by tapping, drilling, or machining operations. Class 2A classification covers the standard tolerance class for most commercial and industrial fastener applications. The Go No Go format allows a single inspector to quickly accept or reject a threaded hole without referencing secondary measurement tools. It is commonly used on production floors, in machine shops, and during field maintenance inspections where 7/16-20 UNF threaded components are present. The included 2-inch handle provides a compact grip profile appropriate for close-tolerance inspection work in tight access areas.

Key Features

• Go and No Go members included for complete Class 2A thread acceptance inspection
• Truncated taperlock design locks gage members firmly into the handle during use
• Tool steel construction provides durability and dimensional stability under repeated inspections
• Covers 7/16-20 UNF fine-thread specification
• Compact 2-inch handle suits confined inspection environments
• Single-unit set simplifies tooling inventory for thread QC work

Compatibility

Designed for inspecting internal 7/16-20 UNF threaded holes to Class 2A tolerance standards in machining, manufacturing, and maintenance applications.

Installation Notes

Thread plug gages are inspection instruments and do not require installation. Before use, confirm the gage members are fully seated and locked in the handle. Clean threaded holes of chips, cutting fluid, and debris before gauging to avoid false readings. Gages should be stored in a protective case and periodically calibrated to maintain measurement accuracy.