Spi 29-316-7 Class Zz Plus Plug Gage 0.316 in Dia

Product Description

The SPI 29-316-7 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.316 inches with a tolerance of 0.0002 inches. Plug gages are go/no-go inspection tools used to confirm that machined holes fall within specified dimensional limits. This gage is constructed from steel for durability and dimensional stability under repeated use. It is suited for quality control applications in machining, manufacturing, and precision fabrication environments where tight hole tolerances must be confirmed quickly and consistently.

Class ZZ Plus plug gages are used in production and inspection settings where moderate-precision hole verification is required. Typical applications include incoming inspection of machined components, in-process quality checks on drill and reamed holes, and final inspection sign-off in manufacturing cells. The 0.316-inch nominal diameter makes this gage a fit for small-bore inspection tasks commonly encountered in metal fabrication and general machining operations.

Key Features

• Nominal measurement diameter of 0.316 inches for small-bore inspection
• Class ZZ Plus tolerance rating of 0.0002 inches for consistent go/no-go verification
• Steel construction provides durability and resistance to wear over repeated inspection cycles
• Compact single-piece design suits bench inspection and in-process floor use

Compatibility

Designed as a direct-use plug gage for inspecting machined holes with a nominal diameter of 0.316 inches in general manufacturing and quality control applications.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and inspection personnel rather than installed as system components. Before use, clean the gage and the bore being inspected to remove chips, coolant, and debris that could affect measurement accuracy. Store the gage in a protective case away from other tools to prevent contact damage to the gage surfaces. Periodic calibration against traceable standards is recommended to maintain measurement integrity over time.