Spi 29-165-8 Class Zz Plus Plug Gage 0.165 in Dia

Product Description

The SPI 29-165-8 is a Class ZZ Plus plug gage designed to verify bore diameters with a nominal measurement diameter of 0.165 inches and a tolerance of 0.0002 inches. Built from steel, this go/no-go style gage gives machinists, quality technicians, and precision tradespeople a reliable way to confirm hole dimensions fall within acceptable limits. Class ZZ Plus gages meet standard tolerancing requirements for inspection-grade hole checking, making this tool appropriate for production floor use and incoming inspection of small-diameter bores.

This plug gage is suited for use in machine shops, manufacturing facilities, and precision fabrication environments where tight bore tolerances must be confirmed before assembly. At 0.165 inches nominal diameter, it targets small-bore applications such as hydraulic fittings, pneumatic components, precision castings, and machined housings where dimensional accuracy is critical. It is typically used by quality control inspectors, CNC machinists, and toolroom personnel performing first-article or in-process inspection.

Key Features

• Nominal measurement diameter of 0.165 inches for small-bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for inspection-grade accuracy
• Steel construction for durability and resistance to wear during repeated use
• Single-piece package quantity suits individual workstation or toolroom use

Compatibility

Designed as an OEM-style inspection gage for use with standard 0.165-inch nominal bore applications in production and quality control settings.

Installation Notes

Plug gages are handled and used by quality technicians and machinists — no power tools or utilities need to be shut off for gage use. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the steel contact surfaces. Do not force the gage into a bore; resistance indicates the bore is out of tolerance. Store in a protective case away from abrasive materials to maintain dimensional integrity.