Spi 23-208-2 Truncated Taperlock Thread Plug Gage 1-12 Unf

Product Description

The SPI 23-208-2 is a truncated taperlock thread plug gage used to verify the accuracy of 1-12 UNF internal threads. It includes both Go and No Go gaging members, allowing technicians to confirm that a threaded hole falls within the Class 2A tolerance range in a single setup. The gage is constructed from tool steel for dimensional stability and wear resistance. The 4-inch handle provides secure grip and consistent insertion force during inspection. This type of gage is standard tooling in precision machining, aerospace, and general manufacturing environments where thread conformance documentation is required.

This gage is suited for production floor inspection and quality-control verification of 1-12 UNF threaded bores. Class 2A is the most common tolerance class for general-purpose unified external threads, making this gage applicable across a wide range of fastener and assembly applications. It is typically used by machinists, quality technicians, and manufacturing engineers performing incoming inspection, in-process checks, or final part acceptance on components with 1-12 UNF internal thread features.

Key Features

• Go and No Go members included for complete Class 2A thread verification in one tool
• Truncated taperlock design for secure, repeatable seating in the handle
• Tool steel construction resists wear during high-cycle production inspection
• 4-inch handle length provides controlled insertion and comfortable grip
• Covers 1-12 UNF thread size for inch-series unified fine threads

Compatibility

Designed for use with standard taperlock-style gage handles. Compatible with 1-12 UNF internal threaded components requiring Class 2A tolerance verification.

Installation Notes

Thread plug gages are hand-operated precision instruments and require no power source or mechanical installation. Ensure threaded bores are clean and free of chips or coolant before gaging to avoid false readings or gage damage. Handle the gaging members carefully to avoid dropping, which can alter calibration. Periodic recalibration against NIST-traceable masters is recommended to maintain measurement integrity per ASME B1.2 gage standards.