Spi 29-693-9 Class Zz Plus Plug Gage 0.693 in Dia

Product Description

The SPI 29-693-9 is a Class ZZ Plus plug gage designed for precision go/no-go inspection of machined holes and bores with a nominal diameter of 0.693 inches. Built to Class ZZ Plus tolerance standards, it holds a dimensional tolerance of 0.0002 inches (0.0002 mm), making it suitable for quality control applications where tight bore verification is required. The gage body is constructed of steel for durability and dimensional stability under repeated use. Machinists, toolroom technicians, and quality inspection personnel use this type of gage in production and maintenance environments to verify hole size conformance to drawing specifications.

This plug gage is used in machining shops, manufacturing facilities, and maintenance operations wherever a 0.693-inch bore must be verified to close tolerances. It is appropriate for both incoming inspection of parts and in-process quality checks on machined components. The Class ZZ Plus designation indicates a tighter manufacturing tolerance on the gage itself compared to standard Class ZZ, supporting more demanding inspection requirements in precision part production.

Key Features

• Nominal measurement diameter of 0.693 inches for direct bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for high-accuracy go/no-go verification
• Steel construction for wear resistance and dimensional stability
• Single-piece packaging — ready for immediate use out of the box

Compatibility

Designed as an OEM-style inspection gage for verifying machined bores with a nominal diameter of 0.693 inches in accordance with Class ZZ Plus gage tolerance standards.

Installation Notes

Plug gages are handled and used by machinists and quality technicians — no power source or trade license is required, but proper gage handling procedures apply. Store and use this gage at controlled ambient temperature to prevent thermal expansion effects on readings. Clean the gage and the bore being inspected before use to avoid false rejections caused by chips or debris. Do not force the gage into a bore; excessive insertion force can damage both the gage and the workpiece surface.