Spi 29-066-8 Class Zz Plus Plug Gage 0.066 Inch

Product Description

The SPI 29-066-8 is a Class ZZ Plus plug gage designed for precision dimensional inspection of small bores and holes. It measures a nominal diameter of 0.066 inches with a tolerance of 0.0002 inches, making it suitable for high-accuracy go/no-go verification tasks in machine shops, quality control departments, and production environments. The gage is constructed from steel for durability and dimensional stability under repeated use. Machinists, quality inspectors, and tooling technicians are the primary users of this instrument in both light manufacturing and precision fabrication settings.

This plug gage is used for verifying hole diameters in metal parts, machined components, and assemblies where tight tolerances are critical. Class ZZ Plus designation indicates it meets a defined accuracy grade suited for inspection of production parts rather than master or reference standards. It is appropriate for use in job shops, manufacturing lines, and inspection labs requiring reliable, repeatable measurement at the 0.066-inch nominal size.

Key Features

• Nominal measurement diameter of 0.066 inches for small-bore inspection
• Class ZZ Plus tolerance grade at 0.0002 inches for high-accuracy go/no-go checks
• Steel construction provides dimensional stability and wear resistance
• Compact form factor suited for tight-clearance inspection applications
• Individual packaging protects the gage surface during storage and transport

Compatibility

Designed as an OEM-style precision plug gage for use in any application requiring dimensional verification of holes or bores with a nominal diameter of 0.066 inches at Class ZZ Plus tolerance.

Installation Notes

Plug gages are handled and used by quality inspectors and machinists — no power source or mechanical installation is required. Clean the gage and the workpiece bore before use to prevent contamination from affecting measurement accuracy. Store the gage in its protective case when not in use to prevent surface damage or corrosion. Follow ASME B89.1.5 or applicable metrology standards for gage calibration and handling procedures.