Spi 29-650-9 Class Zz Plus Plug Gage 0.65 in Steel

Product Description

The SPI 29-650-9 is a Class ZZ Plus plug gage designed for precision hole diameter measurement in machining, manufacturing, and quality control environments. Built from steel, this fixed-limit gage checks 0.65-inch nominal bore diameters with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection workflows where tight dimensional verification is required. It weighs 0.2 pounds and ships as a single unit. Machinists, toolroom technicians, and quality inspectors rely on Class ZZ gages for production-floor inspection of drilled, reamed, or bored holes to confirm conformance to print tolerances.

This plug gage is used in production and inspection settings where 0.65-inch diameter holes must be verified against dimensional specifications. Typical applications include incoming inspection, in-process quality checks, and final verification on machined components. The Class ZZ Plus designation indicates commercial-grade tolerancing appropriate for inspection of general-purpose manufactured parts rather than master gage or reference gage applications.

Key Features

• 0.65-inch nominal measurement diameter for direct bore inspection
• Class ZZ Plus tolerance grade at 0.0002 inches for general-purpose production inspection
• Steel construction for durability and wear resistance in shop environments
• Compact and lightweight at 0.2 pounds for easy single-handed use
• Single-piece unit ready for immediate use out of the package

Compatibility

Designed as a fixed-limit plug gage for inspecting 0.65-inch nominal diameter bores in general-purpose machined components. Consult your gage block or tolerance chart to confirm Class ZZ Plus fits your application tolerance stack.

Installation Notes

Plug gages require no permanent installation and are used as handheld inspection tools. Before use, clean both the gage and the bore being checked to remove chips, coolant, and debris that could affect measurement accuracy. Apply light gage oil to extend gage life and prevent corrosion. Do not force the gage through a tight bore, as this can damage the gage surface and skew readings.