Spi 29-261-5 Class Zz Plus Plug Gage 0.261 in

Product Description

The SPI 29-261-5 is a Class ZZ Plus plug gage used to verify the inside diameter of holes and bored features to a precise measurement standard. Designed for go/no-go inspection work, this plug gage checks whether a 0.261-inch diameter bore falls within acceptable tolerance limits. The tolerance on this gage is 0.0002 inches, placing it in the ZZ classification — the standard tolerance grade widely used for inspection of commercial-quality machined parts. The body is constructed from steel for durability and dimensional stability under normal shop conditions. Machinists, quality control inspectors, and tool and die professionals use plug gages like this one as part of routine incoming, in-process, or final inspection workflows.

This gage is suited for production floor and inspection room use wherever 0.261-inch diameter holes must be verified for conformance. Typical applications include checking drilled, reamed, or bored holes in metal or plastic workpieces. The compact size and steel construction make it practical for repetitive use in both job shop and high-volume manufacturing environments. A single gage is included per package, and no special handling equipment is required for standard inspection tasks.

Key Features

• Class ZZ Plus tolerance grade: 0.0002 inches for commercial inspection applications
• Nominal measurement diameter of 0.261 inches
• Steel construction for durability and dimensional stability
• Single-piece package — ready to use out of the box
• Lightweight at 0.2 pounds for easy one-hand handling during inspection

Compatibility

Designed as a standard Class ZZ Plus plug gage for go/no-go inspection of 0.261-inch diameter bored or drilled features in machined components across general manufacturing and quality control applications.

Installation Notes

Plug gages are handled by quality control inspectors and machinists and do not require power or mechanical installation. Store the gage in a protective case away from abrasive surfaces to preserve the ground diameter. Clean the gage and the bore being checked before use to prevent false readings caused by chips or debris. Handle with clean, dry hands or inspection gloves to minimize thermal expansion effects from body heat on the precision-ground surface.