Spi 29-357-1 Class Zz Plus Plug Gage 0.357 in

Product Description

The SPI 29-357-1 is a Class ZZ Plus plug gage designed to verify the inside diameter of machined holes to a nominal size of 0.357 inches. Built from steel, it provides a reliable go/no-go reference for quality control inspection in production and shop environments. The Class ZZ tolerance grade is suited for inspection of commercial-grade work where high-volume checking is required. With a tolerance of 0.0002 inches, this gage delivers consistent, repeatable measurement performance. Machinists, toolmakers, and quality technicians use plug gages like this to confirm hole size compliance quickly without complex measuring instruments.

This plug gage is appropriate for use in machine shops, manufacturing facilities, and toolrooms where hole diameter verification is part of standard inspection workflow. It is commonly used on drilled, reamed, or bored holes in metal components during incoming inspection, in-process checks, or final quality verification. The compact size and steel construction make it durable for regular use on the shop floor.

Key Features

• Nominal measurement diameter of 0.357 inches for precise hole gauging
• Class ZZ Plus tolerance grade suited for commercial inspection applications
• Tolerance of 0.0002 inches for consistent and repeatable go/no-go checks
• Steel construction for durability in shop and production environments
• Compact and lightweight at 0.2 pounds for easy handling during inspection

Compatibility

Designed as a standard Class ZZ Plus plug gage for verifying machined holes with a nominal inside diameter of 0.357 inches in general manufacturing and inspection applications.

Installation Notes

Plug gages are handled and used by machinists, toolmakers, and quality control inspectors and require no installation in the traditional sense. Store the gage in a protective case when not in use to prevent damage to the gauging surface. Handle with clean, dry hands or cotton gloves to avoid corrosion from skin oils. Always clean the gage and the workpiece hole before use to ensure accurate measurement results.