Spi 29-740-8 Class Zz Plus Plug Gage 0.74 Inch

Product Description

The SPI 29-740-8 is a Class ZZ Plus plug gage designed for precision hole measurement in machining, inspection, and quality-control applications. It measures bores at a nominal diameter of 0.74 inches with a tolerance of 0.0002 inches, meeting Class ZZ Plus accuracy standards. The gage body is steel construction, providing durability through repeated use in production and bench inspection environments. Machinists, quality technicians, and tool-and-die professionals use plug gages like this one to verify whether a drilled, reamed, or bored hole falls within a specified tolerance range.

This plug gage is suited for use in machine shops, manufacturing facilities, and inspection departments where Go/No-Go style hole verification is required. It is appropriate for both incoming inspection of raw materials and in-process quality checks during production runs. The 0.74 inch diameter size covers a range of common bore specifications found in general metalworking and mechanical assembly work. Its compact size and steel body make it practical for bench use or integration into a standard gage collection.

Key Features

• Nominal measurement diameter of 0.74 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches for accurate Go/No-Go inspection
• Steel construction for wear resistance and long service life
• Compact, single-piece design suited for bench and production floor use
• Meets Class ZZ Plus gage accuracy classification for inspection-grade applications

Compatibility

Designed as an OEM-style inspection tool for use with standard 0.74 inch diameter bore specifications in general metalworking, machining, and mechanical assembly 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 measured to remove chips, coolant, and debris that could affect accuracy. Handle the gage carefully to avoid dropping or contact with abrasive surfaces, as nicks or wear will affect measurement accuracy. Store plug gages in a protective case or holder when not in use to maintain calibration integrity.