Spi 29-822-4 Class Zz Plus Plug Gage 0.822 in Dia

Product Description

The SPI 29-822-4 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of internal bores and holes machined to a 0.822-inch nominal diameter. Built from steel, it provides a tolerance of 0.0002 inches, meeting Class ZZ Plus standards for go/no-go inspection work. Machinists, toolroom technicians, and quality control inspectors use this type of gage to confirm that drilled, reamed, or bored features fall within specified limits before parts move to the next stage of production or assembly. Its compact form and straightforward operation make it a reliable bench or floor inspection tool.

This plug gage is suited for use in machine shops, manufacturing facilities, and toolrooms where precise hole inspection is required. It is appropriate for both production-line spot checks and detailed quality audits on machined components. The 0.822-inch diameter size covers a common range of precision-bored features found in mechanical assemblies, hydraulic components, and similar industrial parts requiring tight dimensional control.

Key Features

• Class ZZ Plus tolerance rating of 0.0002 inches for precise hole verification
• Nominal measurement diameter of 0.822 inches
• Steel construction for durability and dimensional stability
• Lightweight at 0.2 pounds for easy handling during inspection
• Single-piece package quantity supports individual replacement or toolroom stocking

Compatibility

Designed as an OEM-style inspection gage for use in toolroom and production quality control applications requiring a 0.822-inch diameter Class ZZ Plus plug gage standard.

Installation Notes

Plug gages are handled and used by machinists, toolroom personnel, and quality control technicians. No power source or special installation is required, but gages should be kept clean, lightly oiled, and stored in a protective case to prevent wear and corrosion. Handle with care to avoid dropping, as impact damage can alter the gage diameter and compromise measurement accuracy. Periodic calibration against traceable standards is recommended to maintain inspection integrity.