Spi 29-980-0 Class Zz Plus Plug Gage 0.98 in Dia

Product Description

The SPI 29-980-0 is a Class ZZ Plus plug gage designed to verify the diameter of machined bores and holes with a nominal measurement diameter of 0.98 inches. Built to Class ZZ Plus tolerances, this gage holds a dimensional tolerance of 0.0002 inches (0.0002 mm), making it suitable for go/no-go inspection workflows in production and quality-control environments. The steel construction provides long service life under regular shop-floor handling. Machinists, toolmakers, and quality technicians use plug gages like this one to confirm that drilled, reamed, or bored features fall within specified limits before a part advances to the next stage of production.

This plug gage is appropriate for use in manufacturing shops, job shops, and inspection departments handling ferrous and non-ferrous workpieces. It is typically deployed during in-process or final inspection of machined components where hole diameter is a controlled dimension. The compact, single-piece design allows use on both shallow and moderately deep bores. It is well suited to environments where repeatable, fast attribute gauging is preferred over variable measurement with calipers or bore micrometers.

Key Features

• Nominal measurement diameter of 0.98 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches ensures accurate go/no-go inspection
• Steel construction for durability and resistance to wear under regular use
• Compact form factor compatible with shallow and moderate-depth bore applications
• Single-piece quantity packaging, ready for immediate use or integration into a gage set

Compatibility

Designed as an OEM-style plug gage for use in standard go/no-go inspection of machined bores and holes with a nominal diameter of 0.98 inches in accordance with Class ZZ Plus tolerance standards.

Installation Notes

Plug gages are handled and used by machinists, toolmakers, and quality technicians — no installation in the traditional sense is required. Before use, clean the gage and the bore being measured to remove chips, coolant, and debris that could affect accuracy. Never force the gage into an undersized bore, as this can damage the gage surface and compromise future measurements. Store the gage in its protective case when not in use to prevent nicks and corrosion.