Spi 29-505-5 Class Zz Plus Plug Gage 0.505 Inch

Product Description

The SPI 29-505-5 is a Class ZZ Plus plug gage designed for verifying internal bore diameters in precision machining and quality control applications. It measures a nominal diameter of 0.505 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work where close-tolerance verification is required. Constructed from steel, this gage provides the durability and dimensional stability needed for repeated use on the shop floor or in the inspection room. Machinists, quality technicians, and toolroom professionals rely on plug gages like this one to confirm that drilled, reamed, or bored holes meet specified dimensional requirements.

This plug gage is used in manufacturing and machine shop environments wherever internal diameter verification is performed. Typical applications include incoming inspection, in-process quality checks, and final part acceptance. It is suited for use on precision components in metalworking, tooling, and general manufacturing where bore size conformance is critical and manual measurement with a micrometer or caliper is insufficient for the required accuracy level.

Key Features

• Class ZZ Plus tolerance class for reliable go/no-go bore inspection
• Nominal measurement diameter of 0.505 inches
• Tolerance of 0.0002 inches for close-tolerance verification
• Steel construction for dimensional stability and long service life
• Compact and lightweight at 0.2 pounds for easy handling during inspection

Compatibility

Designed as a standard Class ZZ Plus plug gage for verifying 0.505-inch nominal internal bore diameters in general precision inspection and quality control applications.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians and do not require installation in the traditional sense. Store the gage in a clean, dry environment and allow it to reach ambient temperature before use to avoid thermal expansion errors. Handle with care to prevent drops or impacts that could alter the gage diameter. Periodic recalibration by a qualified metrology lab is recommended to maintain measurement traceability.