Spi 29-578-2 Class Zz Plus Plug Gage 0.578 in

Product Description

The SPI 29-578-2 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.578 inches with a tolerance of 0.0002 inches. Plug gages of this class are go/no-go inspection tools used to confirm that machined features fall within specified dimensional limits. The steel construction provides durability under repeated use in shop-floor and toolroom inspection environments. Machinists, quality control technicians, and tool-and-die professionals rely on this type of gage for fast, reliable attribute inspection without requiring a measuring instrument readout.

This gage is suited for dimensional inspection of drilled, reamed, or bored holes in production and toolroom settings. It is appropriate for both light-manufacturing and precision-machining environments where hole-size conformance must be verified quickly against a fixed tolerance. The 0.578-inch nominal diameter makes it a direct-fit inspection tool for that specific bore specification. It is typically used as part of a go/no-go gage set or as a standalone check gage at an inspection station.

Key Features

• Nominal diameter of 0.578 inches for direct bore inspection at that dimension
• Class ZZ Plus tolerance of 0.0002 inches for precise attribute gauging
• Steel construction for durability and resistance to wear under repeated use
• Compact form factor suitable for bench-top and in-process inspection
• Single-piece package quantity for individual replacement or targeted inspection use

Compatibility

Designed as an OEM-style inspection gage for any application requiring attribute gauging of a 0.578-inch nominal bore diameter to Class ZZ Plus standards.

Installation Notes

Plug gages are hand-held inspection tools and do not require installation in the traditional sense. Handle with clean, dry hands or lint-free gloves to prevent corrosion from skin contact. Store in a protective case or pouch when not in use to protect the precision-ground surface from damage. Calibration and periodic certification should be performed in accordance with applicable metrology standards and quality system requirements.