Spi 29-748-1 Class Zz Plus Plug Gage 0.748 in

Product Description

The SPI 29-748-1 is a Class ZZ Plus plug gage used to verify inside diameter dimensions in precision machining and inspection workflows. Designed for go/no-go dimensional checks, it measures a nominal diameter of 0.748 inches with a tolerance of 0.0002 inches, making it suitable for quality control applications where tight dimensional accuracy is required. Constructed from steel, this gage provides the durability needed for repeated use in production and inspection environments. It is typically used by machinists, toolroom technicians, and quality assurance professionals.

This plug gage is well suited for inspecting bored holes, reamed holes, and machined features in manufacturing and machine shop settings. It applies to both production-floor inspection and incoming/outgoing quality checks. The 0.748-inch diameter makes it a direct-measurement tool for parts designed to that nominal specification. It is equally relevant in light industrial, aerospace component, and precision fabrication contexts where dimensional verification is part of standard process control.

Key Features

• Class ZZ Plus tolerance class for precision inside diameter verification
• Nominal measurement diameter of 0.748 inches
• Tolerance of 0.0002 inches for tight dimensional control
• Steel construction for wear resistance and long service life
• Compact and lightweight at 0.2 pounds for easy bench or field use

Compatibility

Designed as a direct-measurement plug gage for inside diameter inspection of machined features nominally sized at 0.748 inches, following standard Class ZZ Plus gage tolerance classifications.

Installation Notes

Plug gages are handled and used by machinists or quality control technicians — no installation in the traditional sense applies. Store the gage in a protective case away from contaminants and temperature extremes to maintain calibration integrity. Clean the gage and the workpiece bore before use to prevent false readings. Handle with care to avoid dropping, as impact damage can alter the gage diameter and void measurement accuracy.