Spi 29-086-6 Class Zz Plus Plug Gage 0.086 in

Product Description

The SPI 29-086-6 is a Class ZZ Plus plug gage designed for precision go/no-go measurement of small-diameter bores and holes. It checks whether a drilled, reamed, or machined opening falls within acceptable dimensional limits. The gage measures a nominal diameter of 0.086 inches with a tolerance of 0.0002 inches, meeting Class ZZ Plus standards for dimensional verification in production and inspection environments. Constructed from steel, it provides the hardness and wear resistance required for reliable repeated use. Machinists, quality technicians, and tool-and-die professionals rely on this type of gage for fast, definitive attribute inspection at the workpiece.

This plug gage is suited for incoming inspection, in-process quality control, and final inspection of small-bore features in machined components. Typical applications include verifying hole diameters in precision-machined parts across metalworking, aerospace, and general manufacturing environments. It is particularly useful where tight tolerances must be confirmed quickly without the setup time of a measuring instrument such as a bore micrometer or air gage.

Key Features

• Class ZZ Plus tolerance class for attribute-style go/no-go inspection
• Nominal measurement diameter of 0.086 inches
• Tolerance of 0.0002 inches for high-precision verification
• Steel construction for hardness and long service life
• Compact, single-piece design suited for bench and floor inspection use

Compatibility

Designed as an OEM-style precision inspection tool for use wherever Class ZZ Plus plug gages are specified for small-bore diameter verification in machined components.

Installation Notes

Plug gages should be handled and stored carefully to prevent nicks, corrosion, or contamination that could affect measurement accuracy. Clean the gage and the workpiece bore before use to remove chips, coolant, or debris. Do not force the gage into an undersized bore, as this can damage the gage or the part. Periodic calibration against a certified master is recommended to confirm the gage remains within its stated tolerance class.