Spi 29-969-3 Class Zz Plus Plug Gage 0.969 in

Product Description

The SPI 29-969-3 is a Class ZZ Plus plug gage designed for go/no-go dimensional inspection of machined bores and holes. It measures an inside diameter of 0.969 inches with a tolerance of 0.0002 inches, providing the close-tolerance accuracy required for production quality control and incoming inspection work. Constructed from steel, this gage is built to withstand repeated use in shop environments. Machinists, quality technicians, and tool room professionals use plug gages like this one to verify that a finished bore falls within specified dimensional limits before a part advances to assembly.

Class ZZ Plus plug gages are suited for general-purpose shop inspection where tighter Class Z or ZZ tolerances are required. Typical applications include verifying drilled, reamed, or bored holes in metal fabrication, precision machining, and light manufacturing environments. The 0.969-inch diameter range targets bores common in shaft-fit and bearing-seat applications. This gage is handled as a single-piece unit and requires no additional tooling to operate.

Key Features

• Class ZZ Plus tolerance rating for precise dimensional verification
• 0.969-inch nominal diameter measurement range
• 0.0002-inch tolerance for high-accuracy bore inspection
• Steel construction for durability in shop environments
• Single-piece design — no additional tooling required for use

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for bore inspection applications requiring a 0.969-inch nominal diameter Class ZZ Plus gage.

Installation Notes

Plug gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store the gage in its protective case when not in use and allow it to reach ambient temperature before measuring to avoid thermal expansion errors. Do not force the gage into a bore; light hand pressure is sufficient for accurate go/no-go checking. Periodic calibration against a certified master reference is recommended to maintain measurement traceability.