Spi 29-089-0 Class Zz Plus Plug Gage 0.089 in

Product Description

The SPI 29-089-0 is a Class ZZ Plus plug gage designed for precision hole measurement at a nominal diameter of 0.089 inches. Built from steel, this go/no-go style gage checks whether a drilled, reamed, or otherwise machined bore falls within an acceptable tolerance band. The gage carries a tolerance of 0.0002 inches (0.0002 mm), meeting Class ZZ Plus standards appropriate for inspection of standard-tolerance production holes. Machinists, quality control inspectors, and toolroom technicians use plug gages like this one as a fast, reliable alternative to variable-measurement instruments when a pass/fail check is sufficient.

This gage is suited to production floor and toolroom inspection environments where small-diameter bores must be verified quickly and repeatedly. At 0.089 inches nominal diameter, it covers a common range used in precision machining applications including jig and fixture work, small-bore hydraulic and pneumatic fittings, and instrument-body drilling. The compact size and light weight make it easy to handle during high-volume inspection runs.

Key Features

• Nominal measurement diameter of 0.089 inches for precise small-bore inspection
• Class ZZ Plus tolerance of 0.0002 inches ensures consistent, repeatable pass/fail results
• Steel construction provides durability and resistance to wear during repeated use
• Lightweight at 0.2 pounds, reducing hand fatigue during extended inspection sessions
• Single-piece package quantity supports individual replacement or spot inspection needs

Compatibility

Designed as an OEM-style replacement or standard toolroom plug gage for applications requiring Class ZZ Plus inspection of bores at 0.089 inches nominal diameter.

Installation Notes

Plug gages are handled and stored by quality technicians and machinists following standard metrology practices. Always clean and dry the gage and the bore before use to prevent false readings from chips, coolant, or debris. Store the gage in its case away from temperature extremes to maintain dimensional stability. Do not force the gage into an undersize bore, as this will damage the gage and produce unreliable results.