Spi 29-379-5 Class Zz Plus Plug Gage 0.379 in Dia

Product Description

The SPI 29-379-5 is a Class ZZ Plus plug gage designed for go/no-go inspection of hole diameters measuring 0.379 inches. Built from steel, this fixed-limit gage delivers a tolerance of 0.0002 inches, making it suitable for production inspection workflows where consistent bore verification is required. Machinists, tool room technicians, and quality control inspectors use plug gages like the 29-379-5 to verify that drilled, reamed, or bored holes fall within acceptable dimensional limits without relying on variable measuring instruments.

Class ZZ Plus plug gages are commonly used in production and inspection environments where standard Class ZZ tolerances are tightened to reduce gage wear allowance. This gage is appropriate for inspecting holes in machined metal components across light manufacturing, job shop, and precision machining settings. Its compact size and single-piece steel construction make it straightforward to deploy at the machine or on a CMM bench.

Key Features

• Nominal measurement diameter of 0.379 inches for fixed-limit bore inspection
• Class ZZ Plus tolerance classification at 0.0002 inches for tighter inspection control
• Steel construction for durability in production inspection environments
• Single-piece design requires no setup before use
• Lightweight at 0.2 pounds for easy handling

Compatibility

Designed as a fixed-limit go/no-go plug gage for inspecting bored, drilled, or reamed holes with a nominal diameter of 0.379 inches in machined metal components.

Installation Notes

Plug gages are installed by hand and require no special tools. Clean the gage and workpiece bore before use to prevent debris from affecting the reading. Handle the gage carefully to avoid dropping or contact with abrasive surfaces, as damage to the gage surface will affect tolerance accuracy. Periodic calibration against a certified master is recommended to maintain measurement integrity.