Spi 29-890-1 Class Zz Plus Plug Gage 0.89 Inch

Product Description

The SPI 29-890-1 is a Class ZZ Plus plug gage designed for precision bore and hole measurement in machine shop, toolroom, and quality-control environments. It measures a nominal diameter of 0.89 inches with a tolerance of 0.0002 inches, making it suited for go/no-go inspection workflows where tight dimensional control is required. Constructed from steel for durability and wear resistance, this gage provides repeatable results when verifying machined holes, drilled bores, and similar features. Machinists, quality inspectors, and toolroom technicians are the primary users of this type of instrument.

Class ZZ Plus plug gages are commonly used in production and inspection settings where hole diameter verification is a routine step in the quality process. This gage is appropriate for checking toleranced bores in metal and other rigid materials during incoming inspection, in-process checks, or final verification. The 0.89-inch nominal size fits a specific range of machined hole applications. It ships individually and is suitable for both job-shop and higher-volume inspection environments.

Key Features

• 0.89-inch nominal measurement diameter for targeted bore inspection
• 0.0002-inch tolerance meets Class ZZ Plus gage accuracy standards
• Steel construction provides wear resistance and dimensional stability
• Single-piece packaging supports individual toolroom and inspection use
• Compact and lightweight at 0.2 pounds for easy handling at the bench

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for go/no-go inspection of 0.89-inch nominal diameter bores in standard machining and quality-control applications.

Installation Notes

Plug gages are handled and used by machinists and quality-control inspectors following standard metrology practices. Clean and deburr the bore before gaging to avoid false readings and gage wear. Store the gage in its case or protected location when not in use to prevent damage to the precision ground surface. Follow your facility calibration schedule and handle with clean, dry hands or cotton gloves to prevent corrosion from skin oils.