Spi 29-366-2 Class Zz Plus Plug Gage 0.366 in Steel

Product Description

The SPI 29-366-2 is a Class ZZ Plus plug gage designed for go/no-go dimensional inspection of bored holes, drilled passages, and machined features with a nominal diameter of 0.366 inches. Built from steel, it delivers a dimensional tolerance of 0.0002 inches, making it suitable for moderate-precision inspection tasks in production and maintenance environments. Machinists, quality technicians, and tool-and-die professionals use plug gages like this one to quickly verify that an internal diameter meets print requirements without relying on variable measurement instruments. At 0.2 pounds, the gage is lightweight and easy to handle during repetitive inspection work.

The 29-366-2 is suited for shop-floor inspection of internally machined features in light manufacturing, maintenance repair, and general metalworking applications. It is appropriate for use on ferrous and non-ferrous workpieces where a 0.366-inch nominal bore diameter must be confirmed to tolerance. Class ZZ Plus gages are typically applied in situations where production volumes are moderate and inspection frequency is high, providing a fast, reliable check without complex setup.

Key Features

• 0.366-inch nominal diameter for direct go/no-go bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable moderate-precision verification
• Steel construction for durability under regular shop-floor use
• Lightweight at 0.2 pounds for comfortable single-hand operation
• Single-piece package quantity supports individual replacement or addition to gage sets

Compatibility

Designed as a standard Class ZZ Plus plug gage for inspection of internal bores with a 0.366-inch nominal diameter in general machining and manufacturing applications.

Installation Notes

Plug gages are handled by quality control technicians and machinists and require no installation in the conventional sense, but proper use practice is essential for accurate results. Clean both the gage and the workpiece bore thoroughly before inspection to prevent debris from causing false readings or premature gage wear. Apply gages with light, consistent hand pressure — never force a plug gage into a bore, as this can damage the gage surface and compromise accuracy. Store the gage in a protected case away from other metal tools to prevent nicks or corrosion that would affect the gage diameter.