Spi 29-905-7 Class Zz Plus Plug Gage 0.905 Inch

Product Description

The SPI 29-905-7 is a Class ZZ Plus plug gage designed for checking hole diameters to a nominal size of 0.905 inches. It holds a tolerance of 0.0002 inches, placing it in the tighter ZZ Plus classification used for precision inspection work. The gage is constructed from steel for durability and dimensional stability under repeated use. Machinists, quality control inspectors, and tool room technicians rely on plug gages like this one to verify that drilled, reamed, or bored holes fall within specified limits before parts advance to the next stage of production.

This plug gage is suited for use in machine shops, production facilities, and inspection rooms where consistent hole-size verification is required. It is appropriate for both incoming inspection and in-process quality checks on ferrous and non-ferrous workpieces. The 0.905-inch nominal diameter makes it a fit for applications where fractional or close-decimal hole tolerances must be confirmed quickly and repeatedly without relying on indicating instruments.

Key Features

• Nominal measurement diameter of 0.905 inches for direct go/no-go hole verification
• Class ZZ Plus tolerance of 0.0002 inches for tight inspection accuracy
• Steel construction provides wear resistance and long service life
• Single-piece package quantity suits individual workstation use

Compatibility

Designed as an OEM-style replacement or standard-issue plug gage for use with common gage handle systems that accept 0.905-inch diameter gage members in Class ZZ Plus applications.

Installation Notes

Plug gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Before use, verify the gage surface is free of burrs, chips, or contamination that could produce false readings. Store in a protective case away from temperature extremes to maintain dimensional stability. Gage calibration intervals should follow the facility quality management plan and applicable ASME B89 standards.