Spi 29-658-2 Class Zz Plus Plug Gage 0.658 Inch

Product Description

The SPI 29-658-2 is a Class ZZ Plus plug gage designed for go/no-go inspection of bored holes, drilled passages, and machined openings with a nominal diameter of 0.658 inches. Built from steel, it provides reliable dimensional verification in production and quality-control environments. The tolerance of 0.0002 inches meets Class ZZ Plus classification standards, making it appropriate for checking hole sizes where moderate precision is required. Machinists, quality technicians, and tool-room professionals use plug gages like this one as part of standard incoming and in-process inspection routines.

This gage is suited for use on the shop floor or in a metrology lab setting. It is commonly applied when verifying hole diameters on machined parts, castings, or fabricated components. The 0.658 inch nominal size addresses a specific dimensional requirement and is used wherever that bore dimension must be confirmed to print tolerance before assembly or shipment.

Key Features

• Nominal measurement diameter of 0.658 inches for precise hole verification
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go inspection
• Steel construction for durability under repeated shop-floor use
• Single-piece package quantity suitable for individual technician or inspection station use

Compatibility

Designed as an OEM-style inspection tool for use in any application requiring go/no-go plug gage verification of a 0.658 inch diameter bore.

Installation Notes

Plug gages are handled and used by machinists or quality-control technicians and require no power or mounting. Before use, ensure the gage and workpiece are clean and at ambient temperature to avoid thermal expansion errors. Do not force the gage into an undersize hole, as this can damage the gage surface and compromise accuracy. Store the gage in a protected case when not in use to preserve the ground surfaces.