Spi 29-787-9 Class Zz Plus Plug Gage 0.787 in

Product Description

The SPI 29-787-9 is a Class ZZ Plus plug gage designed to verify bore diameters with a nominal measurement of 0.787 inches and a tolerance of 0.0002 inches. Constructed from steel, this go/no-go style inspection tool is used in precision measurement applications where bore size conformance must be confirmed before assembly or final inspection. It is a standard hand-held gage suited for quality control personnel, machinists, and tool-and-die professionals working in manufacturing and production environments.

This plug gage is appropriate for inspecting drilled, reamed, or bored holes in metal and other rigid materials where tight dimensional control is required. It fits standard shop-floor inspection workflows and pairs with gage blocks or ring gages in a complete dimensional verification program. The 0.787-inch diameter corresponds to a common metric-adjacent bore size used across general machining and light industrial fabrication.

Key Features

• Class ZZ Plus tolerance rating for go/no-go bore verification at 0.787 inches diameter
• Tight 0.0002-inch tolerance for reliable conformance checking
• Steel construction for durability in production and inspection environments
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Single-piece package quantity supports individual workstation deployment

Compatibility

Designed as an OEM-style inspection gage for bore diameter verification in applications requiring a 0.787-inch nominal diameter Class ZZ Plus plug gage.

Installation Notes

Plug gages are installed and operated by quality control technicians or machinists and require no power source or special tooling. Handle the gage by the body, not the measuring pins, to avoid contamination from skin oils that can affect accuracy. Clean the bore and gage contact surfaces before use, and store the gage in its protective case when not in service to prevent wear and corrosion. Follow ASME B89.1.5 or applicable shop inspection standards when establishing gage calibration intervals.