Spi 29-892-7 Class Zz Plus Plug Gage 0.892 in Dia

Product Description

The SPI 29-892-7 is a Class ZZ Plus plug gage machined to a nominal diameter of 0.892 inches with a tolerance of 0.0002 inches. Plug gages are fixed-limit precision tools used to verify that a bored or drilled hole falls within a specified dimensional range. This go/no-go style gage confirms whether a hole diameter meets the required tolerance, eliminating reliance on variable measuring instruments for pass/fail inspection tasks. Constructed of steel, the 29-892-7 is suited for production floor use, incoming inspection, and quality control workflows where consistent, repeatable measurement is required.

This gage is intended for machinists, tool-and-die makers, quality technicians, and manufacturing inspectors working in precision machining environments. It applies to any operation where a 0.892-inch nominal bore must be verified against a tight tolerance spec, including turned, ground, or reamed holes in metal components. The Class ZZ designation indicates a commercial-grade tolerance class appropriate for general inspection work rather than master gage or calibration-lab applications.

Key Features

• Nominal measurement diameter of 0.892 inches for direct go/no-go bore inspection
• Class ZZ Plus classification suitable for commercial and production-floor inspection
• Tolerance of 0.0002 inches for accurate pass/fail determination
• Steel construction for durability and dimensional stability in shop environments
• Compact, lightweight design at 0.2 pounds for easy single-hand use

Compatibility

Designed as a fixed-limit plug gage for verifying 0.892-inch nominal diameter bores in machined metal parts across general manufacturing and production inspection applications.

Installation Notes

Plug gages are handled, not installed, but proper use requires clean, burr-free holes and a lightly oiled gage surface to prevent galling and premature wear. Never force the gage through a bore; if the go end does not pass with light hand pressure, the hole is undersize. Store the gage in its protective case when not in use to prevent surface damage. Periodic recalibration against a traceable standard is recommended to verify gage accuracy over time.