Spi 29-770-5 Class Zz Plus Plug Gage 0.77 Inch

Product Description

The SPI 29-770-5 is a Class ZZ Plus plug gage used to verify bore and hole diameters to a high degree of accuracy in precision machining and metrology applications. It measures a nominal diameter of 0.77 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection workflows where tight dimensional control is required. Constructed from steel, this gage delivers the rigidity and wear resistance needed for repeated use in shop-floor and inspection-room environments. Machinists, quality technicians, and tool-and-die professionals rely on plug gages like this one to confirm that machined features fall within specified tolerance bands before parts advance through production.

Class ZZ Plus plug gages are commonly used in manufacturing shops, machine shops, and inspection departments handling precision components. This gage is appropriate for both incoming inspection of purchased parts and in-process checks during production runs. Its compact size and single-piece construction make it easy to handle during repetitive inspection tasks. Applications include verifying drilled, reamed, or bored holes in metal components where dimensional accuracy directly affects assembly fit and function.

Key Features

• Nominal measurement diameter of 0.77 inches for precise bore verification
• Tolerance of 0.0002 inches supports high-accuracy go/no-go inspection
• Class ZZ Plus classification meets recognized gage accuracy standards
• Steel construction provides durability and resistance to wear during repeated use
• Lightweight at 0.2 pounds for easy handling during inspection tasks

Compatibility

Designed as a direct-use plug gage for inspecting holes and bores with a nominal diameter of 0.77 inches in standard machining and quality-control applications.

Installation Notes

Plug gages are handled and used by quality technicians and machinists and do not require installation in the traditional sense. Before use, clean the gage and the bore being inspected to remove chips, coolant, and debris that could affect the measurement reading. Store the gage in its protective case when not in use to prevent surface damage or corrosion that would compromise accuracy. Periodic calibration against a traceable standard is recommended to maintain measurement integrity over time.