Spi 29-571-7 Class Zz Plus Plug Gage 0.571 in

Product Description

The SPI 29-571-7 is a Class ZZ Plus plug gage machined to a 0.571-inch nominal diameter with a tolerance of 0.0002 inches. Plug gages in this class are used to verify whether a drilled, reamed, or bored hole falls within an acceptable dimensional range. The go/no-go inspection method this gage supports is a standard quality-control step in precision machining, fabrication, and assembly work. Machinists, quality technicians, and tool-and-die professionals rely on Class ZZ tolerances for general-purpose inspection of production parts where close but not ultra-precision measurement is required.

This gage is suited for shop-floor inspection of holes in metal components across a range of manufacturing environments, including job shops, production machining cells, and maintenance repair operations. Its compact size and lightweight steel construction make it easy to handle during repetitive inspection cycles. It is appropriate for use on ferrous and non-ferrous workpieces wherever a 0.571-inch nominal bore must be verified for conformance.

Key Features

• 0.571-inch nominal diameter for direct go/no-go hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for general-purpose production inspection
• Steel construction for durability under shop-floor conditions
• Lightweight at 0.2 pounds for easy single-hand use during inspection
• Sold individually, single-piece minimum order quantity

Compatibility

Designed as a general-purpose Class ZZ Plus plug gage for inspection of 0.571-inch nominal diameter holes in standard machining and fabrication applications.

Installation Notes

Plug gages are handled and used by quality technicians or machinists — no power tools or power shutoff is required. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the steel measuring surface. Do not force the gage into an undersized hole, as this can damage the gage land and compromise measurement accuracy. Store in a protective case away from abrasive surfaces to maintain tolerance integrity.