Spi 29-286-2 Class Zz Plus Plug Gage 0.286 in

Product Description

The SPI 29-286-2 is a Class ZZ Plus plug gage designed to verify hole diameters to a nominal size of 0.286 inches with a tolerance of 0.0002 inches. Built from steel, this go/no-go style gage gives machinists, toolmakers, and quality control technicians a fast, reliable method for checking bore dimensions on production and inspection work. Class ZZ Plus gages meet standard tolerance requirements for general-purpose dimensional inspection and are a staple in machine shops, fabrication facilities, and manufacturing QC departments.

This plug gage is suited for inspecting drilled, reamed, or bored holes where a nominal diameter of 0.286 inches must be confirmed within tight tolerance. It is appropriate for use on production floors, inspection benches, and incoming material checks. Technicians use this gage as part of standard go/no-go inspection routines to confirm that workpiece holes fall within acceptable dimensional limits before assembly or further machining operations.

Key Features

• Nominal measurement diameter of 0.286 inches for precise hole inspection
• Class ZZ Plus tolerance rating of 0.0002 inches suits general-purpose production inspection
• Steel construction provides durability and wear resistance in shop environments
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Go/no-go style enables fast pass-fail inspection without measurement calculation

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose inspection of 0.286-inch nominal diameter bores in machined components across a range of materials and industries.

Installation Notes

Plug gages are handled and used by machinists, toolmakers, and quality inspectors — no installation in the traditional sense is required. Store the gage in a protective case away from moisture and abrasive surfaces to preserve the ground steel finish. Before use, clean both the gage and the workpiece bore to remove chips, coolant, and debris that could cause false readings or accelerate wear. Never force the gage into an undersized hole; apply only light, consistent hand pressure to avoid damaging the gage surface.