Spi 29-274-8 Class Zz Plus Plug Gage 0.274 in

Product Description

The SPI 29-274-8 is a Class ZZ Plus plug gage designed to inspect and verify hole diameters to a nominal size of 0.274 inches. Holding a tolerance of 0.0002 inches, this gage is used in precision measurement applications where tight dimensional control is required. Constructed from steel, it delivers the rigidity and wear resistance expected in production inspection environments. Machinists, quality control technicians, and tool-and-die professionals rely on plug gages like this to confirm that drilled, reamed, or bored holes fall within acceptable limits before parts move to the next stage of assembly.

This plug gage is suited for use in machine shops, manufacturing facilities, and inspection departments handling parts that require close-tolerance hole verification. The 0.274-inch diameter makes it appropriate for inspecting small-bore holes in metal components across general machining, tooling, and light manufacturing applications. Class ZZ Plus designates a working gage grade, making it a practical choice for go/no-go inspection on the shop floor rather than a laboratory-grade master gage application.

Key Features

• Nominal measurement diameter of 0.274 inches for small-bore hole inspection
• Class ZZ Plus tolerance grade at 0.0002 inches for reliable working-gage accuracy
• Steel construction for durability and dimensional stability under repeated use
• Compact and lightweight at 0.2 pounds for easy single-hand operation
• Single-piece packaging suitable for individual replacement or tooling kit additions

Compatibility

Designed as an OEM-style working gage for use in standard plug gage handles and holders compatible with 0.274-inch diameter plug gage members in Class ZZ Plus grade applications.

Installation Notes

Plug gages are used by quality control and machining personnel and require no permanent installation. Before use, clean the gage and the hole being inspected to remove chips, coolant, and debris that could affect the reading. Handle the gage carefully to avoid dropping or striking it, as impact damage can alter the precision surface and invalidate measurements. Store the gage in its protective case or sleeve when not in use to prevent corrosion and wear.