Spi 29-050-2 Class Zz Plus Plug Gage 0.05 in Diameter

Product Description

The SPI 29-050-2 is a Class ZZ Plus plug gage designed for precision hole diameter verification in machining, manufacturing, and quality control applications. Built from steel, this go/no-go style gage checks a nominal bore diameter of 0.05 inches with a tolerance of 0.0002 inches, making it suitable for high-accuracy inspection work where close tolerances must be confirmed before parts advance in production. Machinists, tool room technicians, and quality inspectors use plug gages like this one to verify that drilled, reamed, or bored holes fall within specification without relying on calipers or air gaging.

This gage is appropriate for inspection of small-diameter holes in precision machined components across industries including aerospace, automotive, and general manufacturing. The 0.05-inch nominal diameter targets very fine bores, and the Class ZZ Plus classification indicates the gage meets tighter tolerance standards than standard Class ZZ, supporting more demanding inspection requirements. It is a single-unit item intended for bench-top or in-process inspection use by trained metrology personnel.

Key Features

• Nominal diameter of 0.05 inches for precision small-bore inspection
• Tolerance of 0.0002 inches meeting Class ZZ Plus classification standards
• Steel construction for durability and dimensional stability
• Compact, lightweight design at 0.2 pounds for easy handling at the inspection station
• Single-piece unit suitable for go/no-go hole verification routines

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for inspection setups requiring a 0.05-inch nominal diameter Class ZZ Plus standard gage.

Installation Notes

Plug gages are handled and used by qualified inspection or tool room personnel following established metrology practices. Store the gage in its protective case when not in use to prevent wear or corrosion on the gaging surface. Do not force the gage into a bore; apply light, consistent hand pressure only. Periodic calibration against NIST-traceable standards is recommended to confirm ongoing accuracy.