Spi 29-507-1 Class Zz Plus Plug Gage 0.507 in

Product Description

The SPI 29-507-1 is a Class ZZ Plus plug gage designed for precise go/no-go inspection of bored holes and machined features at a nominal diameter of 0.507 inches. Built from steel, this gage holds a tolerance of 0.0002 inches, making it suitable for medium-precision inspection tasks in production and quality-control environments. Machinists, toolmakers, and quality technicians use plug gages of this class to verify that drilled, reamed, or bored holes fall within specified dimensional limits before parts advance to the next stage of manufacturing.

Class ZZ Plus plug gages are commonly applied in job-shop and production-floor inspection routines where consistent, repeatable measurements are required. This gage is appropriate for checking hole diameters in metal, plastic, or composite workpieces wherever a 0.507-inch nominal bore tolerance must be confirmed. It suits both incoming inspection of purchased parts and in-process verification during machining operations.

Key Features

• Nominal measurement diameter of 0.507 inches for targeted hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go verification
• Steel construction for durability and dimensional stability under shop conditions
• Compact and lightweight at 0.2 pounds for easy single-hand use at the machine or inspection bench

Compatibility

Designed as an OEM-style replacement or standard inspection tool for use wherever a 0.507-inch Class ZZ Plus plug gage is specified in a dimensional inspection procedure.

Installation Notes

Plug gages require no power and no special tools to use, but proper handling is critical to maintaining accuracy. Always clean and deburr the hole being checked before inserting the gage, and use only light, consistent hand pressure to avoid false readings or gage wear. Store the gage in its protective case when not in use to prevent nicks or corrosion that could compromise the tolerance surface. Periodic calibration against a traceable standard is recommended to confirm continued accuracy over time.