Spi 29-039-5 Class Zz Plus Plug Gage 0.039 in

Product Description

The SPI 29-039-5 is a Class ZZ Plus plug gage used to verify bore and hole diameters to a high degree of dimensional accuracy. Manufactured from steel, this gage checks a nominal diameter of 0.039 inches with a tolerance of 0.0002 inches, making it suitable for precision inspection tasks in machine shops, manufacturing facilities, and quality control environments. Class ZZ Plus gages meet established go/no-go standards for production gauging and are handled by machinists, toolmakers, and quality technicians who require reliable, repeatable measurement of small-diameter features.

This plug gage is used in applications where tight dimensional control of small bores is required, including precision machined components, drilled holes, and reamed features. It is appropriate for both incoming inspection and in-process quality checks in light manufacturing and job shop environments. The 0.039-inch diameter makes it well suited for verifying very small hole features where standard measuring tools cannot reach or provide adequate resolution.

Key Features

• Class ZZ Plus tolerance grade for production-level go/no-go inspection
• 0.039-inch nominal diameter for small-bore verification
• 0.0002-inch tolerance for precise dimensional control
• Steel construction for durability and dimensional stability
• Single-piece package quantity suitable for individual bench use

Compatibility

Designed as a standard Class ZZ Plus plug gage for inspection of 0.039-inch nominal diameter bores and holes in precision manufacturing and quality control applications.

Installation Notes

Plug gages are handled by quality technicians and machinists and require no installation in the traditional sense. Ensure the gage and workpiece are at the same temperature before use to avoid thermal expansion errors. Clean both the gage and the bore thoroughly before gauging to prevent damage to the gage surface or inaccurate readings. Store the gage in a protective case when not in use to preserve its tolerance grade.