Spi 29-675-6 Class Zz Plus Plug Gage 0.675 Inch

Product Description

The SPI 29-675-6 is a Class ZZ Plus plug gage designed for go/no-go inspection of machined holes and bores at a nominal diameter of 0.675 inches. Built from steel for durability and dimensional stability, it holds a tolerance of 0.0002 inches (0.0051 mm), meeting Class ZZ Plus standards for general-purpose inspection work. This gage is used by machinists, quality control technicians, and tool room personnel to verify that drilled, reamed, or bored holes fall within specified tolerance limits. It is a direct, single-piece inspection tool with no moving parts, making it straightforward to use and maintain.

This plug gage is suited for production floor and tool room inspection of small-to-medium diameter holes in metalworking, manufacturing, and precision machining environments. It is appropriate for both job shop and production settings where confirming hole size conformance is a routine step in the quality process. The compact size and steel construction make it easy to handle and resistant to wear under repeated use.

Key Features

• Class ZZ Plus tolerance rating for general-purpose hole inspection
• Nominal measurement diameter of 0.675 inches
• Tolerance of 0.0002 inches (0.0051 mm) for consistent, repeatable results
• Steel construction for dimensional stability and long service life
• Single-piece design with no moving parts for ease of use

Compatibility

Designed as a general-purpose Class ZZ Plus plug gage for go/no-go inspection of holes with a nominal diameter of 0.675 inches in standard machining and manufacturing applications.

Installation Notes

Plug gages are handled and applied by machinists or quality control technicians — no power tools or electrical shutoff is required. Keep the gage clean and lightly oiled when not in use to prevent corrosion and preserve accuracy. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise its calibration. Periodic re-calibration against certified masters is recommended to maintain measurement traceability.