Spi 29-828-1 Class Zz Plus Plug Gage 0.828 Inch

Product Description

The SPI 29-828-1 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.828 inches with a tolerance of 0.0002 inches. Built from steel for dimensional stability and wear resistance, this gage is used for go/no-go inspection work on production floors and in machine shops. Class ZZ gages meet standard tolerance grades appropriate for general-purpose inspection where high-volume checking of manufactured parts is required. Machinists, quality technicians, and tool room personnel use this gage to confirm that drilled, reamed, or bored features fall within acceptable dimensional limits.

This plug gage is suited for incoming inspection, in-process quality control, and final part verification in metalworking, manufacturing, and precision machining environments. It is sized for holes nominally at 0.828 inches and is appropriate for use in both job shop and production settings where consistent bore measurement is critical. The compact form factor and light weight of 0.2 pounds make it easy to handle at the machine or inspection bench.

Key Features

• Nominal measurement diameter of 0.828 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches for general-purpose inspection applications
• Steel construction provides durability and dimensional stability under repeated use
• Lightweight at 0.2 pounds for convenient bench and floor use
• Single-piece package quantity supports individual replacement or tooling additions

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for any application requiring go/no-go bore verification at a nominal 0.828-inch diameter in accordance with Class ZZ Plus gage standards.

Installation Notes

Plug gages are handled and used by quality technicians and machinists and do not require installation in the traditional sense. Before use, clean the gage and the bore being checked to remove chips, coolant, and debris that could affect readings. Never force a plug gage into a hole; if resistance is felt before full insertion, the bore is undersize. Store gages in a protective case away from other tooling to prevent nicking the gage surface, which would compromise accuracy.