Spi 29-088-2 Class Zz Plus Plug Gage 0.088 in

Product Description

The SPI 29-088-2 is a Class ZZ Plus plug gage designed for precision bore and hole inspection at a nominal diameter of 0.088 inches. It is machined from steel and holds a tolerance of 0.0002 inches, making it suitable for go/no-go verification work in production and quality-control environments. Machinists, toolroom technicians, and quality inspectors use this gage to confirm that drilled, reamed, or bored features fall within specified dimensional limits. The Class ZZ Plus designation indicates a tighter tolerance class than standard Class ZZ, which is relevant when checking close-tolerance fits in precision assemblies.

This plug gage fits applications in precision machining shops, toolrooms, and inspection departments where small-diameter hole verification is required. It is well-suited for checking pilot holes, clearance holes, and reamed bores in metal components. At 0.088 inches nominal diameter, it addresses a size range commonly encountered in small mechanical assemblies, instrument components, and fluid-control parts. Weighing approximately 0.2 pounds, it is a compact, hand-held gage used directly at the machine or at an inspection bench.

Key Features

• 0.088 inches nominal measurement diameter for small-bore inspection
• 0.0002 inches tolerance for high-accuracy go/no-go verification
• Class ZZ Plus classification provides tighter tolerances than standard Class ZZ
• Steel construction for durability and dimensional stability during repeated use
• Compact and lightweight at 0.2 pounds for easy bench or floor use

Compatibility

Designed as an OEM-style precision inspection gage for use in quality-control and toolroom applications requiring small-diameter hole verification at 0.088 inches nominal diameter.

Installation Notes

Plug gages are used by machinists and quality-control technicians and require no installation in the traditional sense, but proper handling is critical to accuracy. Clean the gage and the workpiece bore thoroughly before gauging to prevent debris from causing false readings or surface damage. Store the gage in its protective case when not in use to prevent corrosion and contact damage. Handle only as needed to avoid thermal expansion from body heat affecting measurement results.