Spi 29-034-6 Class Zz Plus Plug Gage 0.034 in

Product Description

The SPI 29-034-6 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.034 inches with a tolerance of 0.0002 inches. Machined from steel, this gage is used for go/no-go inspection of small-diameter features in precision manufacturing and metrology applications. Class ZZ Plus designates a tighter tolerance grade than standard Class ZZ, making it appropriate for quality control work where dimensional accuracy is critical. Machinists, toolroom inspectors, and quality technicians rely on plug gages like this one to confirm that drilled, reamed, or punched holes meet specification before parts advance through the production process.

This plug gage is suited for inspection of small-bore features in precision machined components, stamped parts, and fabricated assemblies. It is commonly used in job shops, production facilities, and metrology labs where consistent, repeatable hole verification is required. The compact size makes it appropriate for tight-clearance features and fine tooling work where standard gaging equipment may not reach.

Key Features

• Nominal diameter of 0.034 inches for precise small-bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for tight dimensional control
• Steel construction for durability and wear resistance in shop environments
• Single-piece package quantity supports individual or bench-level inspection use

Compatibility

Designed as a replacement or supplemental plug gage for Class ZZ Plus applications requiring a 0.034-inch nominal bore diameter check.

Installation Notes

Plug gages are handled and stored by quality technicians and toolroom personnel, not typically installed by a trade contractor. Before use, clean the gage and the bore being checked to remove chips, coolant, or debris that could affect measurement accuracy. Do not force the gage into an undersized hole, as this will damage the gage surface and compromise future readings. Store in a protective case away from moisture and temperature extremes to maintain calibration integrity.