Spi 19-353-2 Class Zz Minus Plug Pin Gage 0.353 in

Product Description

The SPI 19-353-2 is a Class ZZ minus plug pin gage machined to a nominal diameter of 0.353 inches with a minus tolerance of 0.0002 inches. Plug pin gages are precision hand tools used to verify bore diameters, hole sizes, and internal dimensions to a known standard. The Class ZZ designation indicates a working-grade gage intended for shop-floor inspection and production measurement tasks. Constructed from steel, this gage provides the durability and dimensional stability required for repeated use in manufacturing and quality control environments. Machinists, toolmakers, and quality technicians use plug pin gages to confirm that drilled, reamed, or bored features meet print tolerances before parts advance to the next operation.

This gage is suited for production floor inspection, incoming material verification, and fixture qualification in machine shops, fabrication facilities, and manufacturing plants. The 0.353-inch nominal size covers a common bore range found in general metalworking applications. The minus tolerance configuration means the gage is ground slightly below nominal, making it appropriate for go-gage applications where a passing fit confirms the hole is at or above the minimum acceptable size. It is a single-piece gage intended for manual hand inspection without additional tooling.

Key Features

• Nominal diameter of 0.353 inches for precise bore and hole verification
• Class ZZ working-grade tolerance of 0.0002 inches minus for shop-floor inspection
• Steel construction for dimensional stability and resistance to wear
• Minus plug configuration suited for go-gage applications
• Lightweight at 0.2 pounds for comfortable single-hand use

Compatibility

Designed as a working-grade plug pin gage for general shop-floor inspection of bored, drilled, or reamed holes with a nominal diameter of 0.353 inches.

Installation Notes

Plug pin gages are used by machinists and quality technicians and require no installation. Before use, clean the gage and the feature being inspected to remove chips, coolant, and debris that could affect the measurement. Handle the gage carefully to avoid dropping or striking it against hard surfaces, as impact can alter the ground diameter. Store the gage in its protective case or sleeve when not in use to prevent corrosion and dimensional damage.