Spi 29-874-5 Class Zz Plus Plug Gage 0.874 in Dia

Product Description

The SPI 29-874-5 is a Class ZZ Plus plug gage designed for verifying the diameter of machined holes to a nominal size of 0.874 inches. Built from steel, it holds a tolerance of 0.0002 inches, meeting Class ZZ Plus standards for go/no-go inspection work. Plug gages of this type are used in quality control and machining environments to confirm that bored, drilled, or reamed holes fall within acceptable dimensional limits. Machinists, toolmakers, and quality technicians rely on this gage for fast, repeatable in-process and final inspection checks.

This plug gage is suited for use in manufacturing, machine shops, and production environments where hole diameter verification is part of the inspection process. It is appropriate for both in-process checks at the machine and final inspection at the CMM table or inspection bench. The 0.874-inch nominal diameter targets a specific bore size common in precision-machined components.

Key Features

• 0.874-inch nominal measurement diameter for direct hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go gauging
• Steel construction for durability and dimensional stability under shop conditions
• Compact, single-piece gage format for quick handheld use
• Consistent with standard plug gage inspection practice for machined bores

Compatibility

Designed as a Class ZZ Plus plug gage for inspecting machined holes with a nominal diameter of 0.874 inches in standard go/no-go gauging applications.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians and require no power or special tooling for operation. Store the gage in its case when not in use to prevent damage to the gauging surfaces. Clean the gage and the bore before inspection to avoid false readings caused by chips or coolant residue. Do not force the gage into the hole, as damage to the gauging surface will affect accuracy.