Spi 19-406-8 Class Zz Minus Plug Pin Gage 0.406 in

Product Description

The SPI 19-406-8 is a Class ZZ minus plug pin gage machined from steel, designed to verify bore and hole diameters in manufacturing and inspection applications. With a nominal diameter of 0.406 inches and a tolerance of 0.000200 inches, this gage provides reliable go/no-go dimensional verification at the precision required for production-floor and quality-control work. It is used by machinists, toolmakers, metrologists, and quality inspectors who need fast, repeatable measurement of internal features without the setup time of indicating gages. The minus designation means the gage is ground to the lower boundary of the tolerance range, making it suitable for go-gage applications.

This plug pin gage is suited for dimensional inspection in machine shops, fabrication facilities, and manufacturing quality departments. It is used to check hole sizes on machined parts, castings, and drilled or reamed bores where tight tolerances must be confirmed before assembly. The 0.406-inch diameter covers a common bore size encountered in general metalworking and precision machining environments. Package quantity is one gage per unit.

Key Features

• Class ZZ tolerance class for general-purpose inspection and production go/no-go gauging
• Minus designation ground to lower tolerance boundary for go-gage applications
• 0.000200-inch tolerance for consistent, repeatable dimensional verification
• Steel construction for durability and wear resistance in production environments
• 0.406-inch nominal diameter covers a standard bore size in metalworking applications
• Lightweight at 0.2 pounds for easy single-hand use during inspection

Compatibility

Designed as an OEM-style replacement or standard addition to plug gage sets used in general-purpose bore inspection of machined components requiring a 0.406-inch nominal diameter check.

Installation Notes

Plug pin gages are handled and used by machinists, quality inspectors, and metrologists and require no permanent installation. Store the gage in its protective case when not in use to prevent damage to the ground surfaces. Clean the gage and the bore being checked before use to prevent debris from causing false readings or surface wear. Handle with care to avoid dropping, as impact can alter the ground diameter and compromise measurement accuracy.