Spi 29-574-1 Class Zz Plus Plug Gage 0.574 in

Product Description

The SPI 29-574-1 is a Class ZZ Plus plug gage designed to inspect hole diameters with a nominal measurement of 0.574 inches. Built from steel, this go/no-go style gage delivers a tolerance of 0.0002 inches, making it suitable for quality control applications where precise bore verification is required. Machinists, toolroom technicians, and quality assurance personnel use plug gages like this one to confirm that drilled, reamed, or bored holes fall within acceptable dimensional limits before parts advance through production.

This plug gage is used in machine shops, manufacturing facilities, and toolrooms where dimensional inspection of steel, aluminum, or other workpieces is part of the standard process. It is well suited for moderate-volume inspection tasks on production floors as well as bench-level verification work. The Class ZZ Plus designation indicates a tolerance grade appropriate for general-purpose inspection rather than master or reference gage applications.

Key Features

• Nominal measurement diameter of 0.574 inches for direct bore verification
• Tolerance of 0.0002 inches for reliable Class ZZ Plus accuracy
• Steel construction for durability in shop environments
• Compact and lightweight at 0.2 pounds for easy handling
• Single-piece package quantity suitable for individual replacement or bench use

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for any application requiring inspection of a 0.574-inch nominal hole diameter at Class ZZ Plus tolerance grade.

Installation Notes

Plug gages are handled and used by machinists and quality technicians following standard metrology practices. Keep the gage clean and lightly oiled when not in use to prevent corrosion. Do not force the gage into a hole; if resistance is encountered, the bore is undersize and the gage should be withdrawn without applying additional pressure. Store in a protective case away from temperature extremes to maintain dimensional stability.