Spi 29-900-8 Class Zz Plus Plug Gage 0.9 Inch

Product Description

The SPI 29-900-8 is a Class ZZ Plus plug gage designed for precise go/no-go dimensional inspection of bored holes and internal features. Manufactured from steel, this gage checks a nominal diameter of 0.9 inches with a tolerance of 0.0002 inches, making it suitable for applications where tight dimensional control is required. Class ZZ gages meet standard tolerances for general-purpose inspection work and are a common tool in quality control environments across machining, manufacturing, and fabrication shops.

This plug gage is used in production and inspection settings where hole diameter verification is part of the quality assurance process. It is appropriate for both in-process checks on the shop floor and final inspection before part acceptance. Machinists, quality technicians, and tool room professionals use Class ZZ plug gages to confirm that drilled, reamed, or bored holes fall within acceptable dimensional limits.

Key Features

• Class ZZ Plus tolerance class for general-purpose hole inspection
• 0.9 inch nominal measurement diameter
• 0.0002 inch tolerance for accurate dimensional verification
• Steel construction for durability and wear resistance
• Single-piece package quantity suitable for individual or low-volume procurement

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for inspection of 0.9 inch nominal diameter holes in general machining and manufacturing applications.

Installation Notes

Plug gages are handled and used by quality technicians and machinists during inspection operations. Before use, clean the gage and the hole being measured to remove chips, coolant, or debris that could affect accuracy. Do not force the gage into an undersized hole, as this can damage both the gage and the workpiece. Store the gage in its protective case when not in use to prevent surface damage and maintain calibration integrity.