Spi 29-998-2 Class Zz Plus Plug Gage 0.998 in Dia

Product Description

The SPI 29-998-2 is a Class ZZ Plus plug gage designed for precision bore and hole measurement in machining, manufacturing, and inspection applications. It measures a nominal diameter of 0.998 inches with a tolerance of 0.0002 inches, providing the tight accuracy required for go/no-go dimensional verification. Built from steel for durability and wear resistance, this plug gage is a standard tool for quality control technicians and machinists who need reliable, repeatable measurement results on production or inspection floors.

This gage is suited for use in machine shops, tool rooms, and manufacturing facilities where hole diameter verification is part of a quality assurance process. It fits into workflows that require compliance with dimensional tolerances on bored, drilled, or reamed holes. The compact form factor and 0.2-pound weight make it easy to handle during repeated inspection cycles.

Key Features

• Class ZZ Plus tolerance rating for precision dimensional inspection
• 0.998-inch nominal measurement diameter
• 0.0002-inch tolerance for tight accuracy requirements
• Steel construction for durability and wear resistance
• Lightweight at 0.2 pounds for easy single-hand use during inspection

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in go/no-go inspection of holes and bores at a nominal diameter of 0.998 inches. Suitable for use with standard gage handle sets compatible with this diameter range.

Installation Notes

Plug gages should be handled and stored carefully to prevent damage to the precision ground surfaces. Clean the gage and the bore being measured before use to ensure accurate readings. Do not force the gage into a hole; apply only light, steady pressure. Calibration and periodic re-inspection against gage blocks or master rings is recommended to maintain measurement accuracy over time.