Spi 23-164-7 Truncated Taperlock Thread Plug Gage 3/8-16 Unc

Product Description

The SPI 23-164-7 is a truncated taperlock thread plug gage designed to verify 3/8-16 UNC internal threads to Class 2A tolerance. It includes both Go and No Go members, allowing a technician or quality inspector to confirm that a threaded hole is within the correct tolerance range in a single tool set. The gage is constructed from tool steel for durability and dimensional stability under repeated use. The included 2-inch handle provides a standard grip for controlled insertion. This type of gage is a staple in machining, fabrication, and assembly inspection environments where thread quality must be verified to print.

This gage is used in manufacturing, maintenance, and quality control applications wherever 3/8-16 UNC threaded holes must be inspected for conformance. It is appropriate for both production-line inspection and field verification work. The Go member confirms the hole accepts a mating fastener within tolerance; the No Go member confirms the hole has not been overcut. It is suited for use in metalworking shops, industrial assembly lines, and precision fabrication facilities.

Key Features

• Go and No Go members included for complete tolerance verification in one set
• Class 2A classification for standard unified coarse thread inspection
• Tool steel construction for dimensional stability and long service life
• Truncated taperlock design for secure, repeatable member seating in the handle
• 2-inch handle included for controlled, consistent insertion force
• Covers 3/8-16 UNC thread specification

Compatibility

Designed for inspection of 3/8-16 UNC internal threads to Class 2A tolerance. The taperlock handle is compatible with standard taperlock-style gage members of the appropriate size range.

Installation Notes

Thread plug gages are inspection tools and do not require installation. Before use, ensure the threaded hole is clean and free of chips, coolant, or debris that could affect gage seating. Apply light gage oil or thread lubricant as appropriate for the material being inspected. Do not force the No Go member into a hole; if it enters under hand pressure, the thread is out of tolerance. Store gage members separately from abrasive materials to prevent damage to the calibrated surfaces.