Spi 29-956-0 Class Zz Plus Plug Gage 0.956 in Steel

Product Description

The SPI 29-956-0 is a Class ZZ Plus plug gage designed to verify bore and hole diameters in precision machining and inspection work. It measures 0.956 inches in diameter and holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection tasks where dimensional accuracy is critical. Constructed from steel, the gage provides durability under repeated use in shop-floor and quality-control environments. Machinists, toolmakers, and quality inspectors use this type of gage to confirm that drilled, reamed, or bored features meet specified tolerances before parts advance through production.

This plug gage is applied in precision manufacturing, toolroom inspection, and incoming or final quality inspection scenarios. It is well suited for checking holes in machined components, fixtures, and assemblies where a 0.956-inch nominal diameter is the target feature. Class ZZ Plus designation indicates the gage meets the tolerance class commonly used for production-level inspection rather than laboratory-grade master gaging. A single gage is packaged per unit, making it easy to add to an existing gage set or replace a worn member.

Key Features

• 0.956-inch nominal diameter for direct bore inspection at that target size
• 0.0002-inch tolerance (0.0051 mm) meets Class ZZ Plus accuracy requirements
• Steel construction resists wear during repeated go/no-go checks
• Compact and lightweight at 0.2 pounds for easy bench and field handling
• Single-piece packaging allows individual replacement without buying a full set

Compatibility

Designed as an OEM-style replacement or add-on plug gage member for use in standard go/no-go gage handles accepting 0.956-inch Class ZZ Plus gage blanks.

Installation Notes

Plug gages are installed and used by machinists, toolmakers, and quality-control technicians following shop metrology procedures. Clean and deburr the bore and the gage member before inspection to prevent false readings or surface damage. Handle steel plug gages with care to avoid dropping, which can alter the precision surface or change dimensional accuracy. Store the gage in a protective case away from coolants and abrasive contaminants when not in use.