Spi 29-329-0 Class Zz Plus Plug Gage 0.329 in

Product Description

The SPI 29-329-0 is a Class ZZ Plus plug gage used to verify the diameter of machined holes and bores to a high degree of precision. It measures a nominal diameter of 0.329 inches with a tolerance of 0.0002 inches, making it suited for inspection and quality control work where tight dimensional verification is required. The gage is constructed from steel for durability under repeated use. Machinists, toolmakers, and quality control technicians use plug gages like this one to confirm that drilled, reamed, or bored features fall within specified tolerance ranges on production and repair parts.

This plug gage is intended for dimensional inspection in machine shops, manufacturing facilities, and toolrooms. It is typically used as a go/no-go reference or a direct-measurement verification tool when checking hole sizes during in-process or final inspection of machined components. The 0.329-inch diameter makes it applicable to a range of precision machining work where consistent bore sizing must be confirmed across a production run or individual part.

Key Features

• Class ZZ Plus accuracy grade for dimensional inspection and quality control applications
• Nominal measurement diameter of 0.329 inches
• Tolerance of 0.0002 inches for precise hole verification
• 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 an OEM-style replacement or direct-use precision measurement tool compatible with standard plug gage handles and fixtures that accept gages in the applicable diameter range for Class ZZ Plus inspection work.

Installation Notes

Plug gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Before use, verify the gage surface is free of burrs, debris, or damage that could affect measurement accuracy. Store the gage in its protective case when not in use to prevent wear or impact damage. Calibration should be verified periodically against a known reference standard in accordance with your facility quality management procedures.