Spi 29-516-2 Class Zz Plus Plug Gage 0.516 in

Product Description

The SPI 29-516-2 is a Class ZZ Plus plug gage designed to verify bore diameters with a nominal measurement of 0.516 inches and a tolerance of 0.0002 inches. Built from steel for durability and dimensional stability, this gage provides a reliable go/no-go check in production and inspection environments. Class ZZ Plus gages meet the tightest standard in the ZZ classification, making them appropriate for quality control applications where precise hole acceptance criteria must be consistently enforced. Machinists, toolroom technicians, and quality inspectors use plug gages as part of standard in-process and final inspection routines.

This gage is suited for use in manufacturing facilities, machine shops, toolrooms, and inspection departments where bore diameters near 0.516 inches must be held to close tolerances. It is appropriate for both production-floor spot checks and formal inspection station use. The compact form factor and light weight of 0.2 pounds make it easy to handle during repetitive checking tasks on parts produced to tight dimensional specifications.

Key Features

• Nominal measurement diameter of 0.516 inches for precise bore verification
• Tolerance of 0.0002 inches meeting Class ZZ Plus classification requirements
• Steel construction for dimensional stability and wear resistance
• Lightweight at 0.2 pounds for comfortable repetitive use
• Single-piece packaging suitable for individual replacement or toolroom stocking

Compatibility

Designed as an OEM-style replacement or supplemental inspection tool for any application requiring a Class ZZ Plus plug gage at a nominal bore diameter of 0.516 inches.

Installation Notes

Plug gages are used by machinists and quality technicians and require no installation in the traditional sense, but proper handling is critical to accuracy. Store the gage in its case when not in use and keep it clean and lightly oiled to prevent corrosion. Allow the gage and the part being checked to reach the same ambient temperature before use, as thermal expansion can introduce measurement error. Do not force the gage into a bore; if resistance is felt, the hole is undersized and the part should be returned for rework.