Spi 29-353-0 Class Zz Plus Plug Gage 0.353 in Dia

Product Description

The SPI 29-353-0 is a Class ZZ Plus plug gage designed to verify the inside diameter of bores, holes, and machined features to a nominal size of 0.353 inches. Built from steel, it delivers a stated tolerance of 0.0002 inches, making it suitable for go/no-go dimensional inspection in manufacturing, machining, and quality-control environments. Machinists, quality technicians, and toolroom professionals use Class ZZ Plus gages for routine inspection of production parts where tighter gage-block grades are not required. The compact form factor and single-piece construction make it easy to handle during high-volume inspection work.

This plug gage is appropriate for use in machine shops, tool rooms, and manufacturing facilities performing dimensional verification of drilled, reamed, or bored holes at 0.353 inches nominal diameter. It is well suited to incoming inspection, in-process quality checks, and final part verification on both ferrous and non-ferrous workpieces. The steel construction holds up under repeated insertion into production parts during standard inspection cycles.

Key Features

• Class ZZ Plus tolerance rating of 0.0002 inches for reliable dimensional verification
• Nominal measurement diameter of 0.353 inches
• Steel construction for durability through repeated use
• Lightweight at 0.2 pounds for easy single-hand operation
• Single-piece gage format suited to go/no-go inspection workflows

Compatibility

Designed as a direct-use Class ZZ Plus plug gage for inspection of 0.353-inch nominal diameter bores and holes in standard machining and quality-control applications.

Installation Notes

Plug gages are handled by quality technicians and machinists and do not require power or mechanical installation. Store the gage in a clean, dry location away from cutting fluids and abrasives to preserve the gage surface and tolerance integrity. Handle with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Do not force the gage into an undersized bore, as this can damage the gage surface and invalidate its calibration.