Spi 29-868-7 Class Zz Plus Plug Gage 0.868 in

Product Description

The SPI 29-868-7 is a Class ZZ Plus plug gage designed for precision bore measurement in machining and inspection environments. Built to a tolerance of 0.0002 inches, this gage checks hole diameter conformance at 0.868 inches. The steel construction provides durability for repeated use on the shop floor or in a quality control setting. Class ZZ Plus gages are used in go/no-go inspection workflows to verify that drilled, reamed, or bored holes fall within specified dimensional limits. Machinists, toolroom technicians, and quality inspectors rely on this type of gage for fast, repeatable in-process and final inspection checks.

This plug gage is suited for use in manufacturing, toolroom, and metrology lab environments where hole diameter verification is required. It applies to ferrous and non-ferrous workpieces across a range of industries including general machining, aerospace component inspection, and precision fabrication. The 0.868-inch nominal diameter makes it a direct fit for inspection of correspondingly sized bores.

Key Features

• Class ZZ Plus tolerance rating at 0.0002 inches for high-accuracy bore inspection
• 0.868-inch nominal measurement diameter
• Steel construction for durability and resistance to wear during repeated use
• Compact and lightweight at 0.2 pounds for easy handling during inspection
• Designed for go/no-go inspection workflows in production and toolroom settings

Compatibility

Designed as a precision inspection tool for verifying 0.868-inch diameter bores in machined components. Compatible with standard plug gage handles and fixtures sized for this nominal diameter range.

Installation Notes

Plug gages should be handled by qualified machinists or quality technicians familiar with dimensional inspection practices. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain accuracy. Do not force the gage into an undersized bore, as this can damage the gage and compromise its calibration. Store in a protective case away from heat sources and abrasive materials to preserve tolerance integrity.