Spi 29-580-8 Class Zz Plus Plug Gage 0.58 in Diameter

Product Description

The SPI 29-580-8 is a Class ZZ Plus plug gage designed for checking the dimensional accuracy of holes and bores at a nominal diameter of 0.58 inches. Built from steel, this go/no-go style gage provides a tolerance of 0.0002 inches, making it suitable for production inspection and quality control applications where tight dimensional verification is required. Licensed machinists, tool-and-die makers, and precision metrology technicians use plug gages like this to verify hole acceptance criteria against print tolerances without specialized measuring equipment.

This gage is suited for shop floor and inspection room use in manufacturing, machining, and mechanical assembly environments. Class ZZ Plus gages are typically applied to lower-precision production work where the required hole tolerance is wider than Class X or Class Z, but consistent dimensional verification is still necessary. The compact size and steel construction make it durable for repeated daily use in high-volume inspection cycles.

Key Features

• Nominal measurement diameter of 0.58 inches for direct hole verification
• Class ZZ Plus tolerance rating of 0.0002 inches for production-grade inspection
• Steel construction for durability and resistance to wear in shop environments
• Single-piece package quantity suitable for individual workstation or toolbox deployment

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for applications requiring a 0.58-inch nominal diameter Class ZZ Plus go/no-go inspection tool in standard steel construction.

Installation Notes

Plug gages are handled and used by machinists, quality control inspectors, and tool-and-die technicians. Before use, clean the gage and the bore being checked to remove chips, coolant, and debris that could affect measurement accuracy. Apply light gage oil when checking ferrous bores to prevent corrosion and reduce wear on the gage surface. Store the gage in its protective case or designated holder when not in use to preserve calibration integrity.