Spi 29-704-4 Class Zz Plus Plug Gage 0.704 Inch

Product Description

The SPI 29-704-4 is a Class ZZ Plus plug gage used to verify the diameter of bored holes, drilled passages, and machined features in production and inspection environments. Sized at 0.704 inches in diameter with a tolerance of 0.0002 inches, this gage delivers the dimensional accuracy required for go/no-go inspection routines. The steel construction provides durability for repeated use in shop floor and quality-control settings. Machinists, toolmakers, and quality-assurance technicians working in light manufacturing or precision machining operations typically use this type of gage.

This plug gage is suited for inspecting cylindrical bores where tight dimensional control is required. Class ZZ Plus gages are commonly used in medium-tolerance production inspection, making this an appropriate choice for verifying drilled or reamed holes in metal components. It is a single-piece gage intended for straightforward diameter verification without requiring additional tooling or calibration equipment at point of use.

Key Features

• 0.704 inch nominal diameter for precise hole inspection
• Class ZZ Plus tolerance rating at 0.0002 inches for production-grade accuracy
• Steel construction for wear resistance and long service life
• Compact and lightweight at 0.2 pounds for easy handling
• Single-piece design requires no assembly before use

Compatibility

Designed as an OEM-style inspection gage for verifying bored or drilled cylindrical features with a nominal diameter of 0.704 inches in standard production and quality-control applications.

Installation Notes

Plug gages are used by machinists and quality-control technicians and do not require power or mechanical installation. Before use, clean the gage and the bore being measured to remove chips, coolant, and debris that could affect the reading. Do not force the gage into an undersized bore, as this can damage the gage surface and compromise calibration. Periodic recalibration against a traceable standard is recommended to maintain measurement integrity.