Spi 29-612-9 Class Zz Plus Plug Gage 0.612 Inch

Product Description

The SPI 29-612-9 is a Class ZZ Plus plug gage designed to verify hole diameters to a nominal size of 0.612 inches with a tolerance of 0.0002 inches. Plug gages of this class are used for go/no-go inspection work where tight dimensional control is required. The ZZ Plus designation indicates a commercial-grade tolerance class suited for inspection of production parts in shop-floor and quality-control environments. Machined from steel, this gage provides the hardness and wear resistance necessary for repeated use in precision measurement applications. Metrology technicians, machinists, and quality inspectors are the primary users of this tool.

This plug gage is appropriate for inspecting drilled, reamed, or bored holes in metal and plastic components where the target diameter is 0.612 inches. It is commonly used in production inspection lines, tool rooms, and incoming-goods inspection stations. The compact form factor and low weight make it easy to handle during repetitive inspection cycles. It is well suited for both job-shop environments and larger manufacturing operations requiring consistent, traceable dimensional verification.

Key Features

• Nominal measurement diameter of 0.612 inches for precise hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for commercial-grade go/no-go gauging
• Steel construction for hardness and long service life under repeated use
• Lightweight at 0.2 pounds for easy single-hand operation
• Single-piece packaging suits individual tool crib or bench use

Compatibility

Designed as a standard Class ZZ Plus plug gage for go/no-go hole inspection of 0.612-inch nominal diameter features in production and quality-control applications.

Installation Notes

Plug gages are handled and used by machinists, metrologists, and QC inspectors and do not require installation in the traditional sense. Store the gage in a protective case or sleeve when not in use to prevent surface damage. Clean the gage and the workpiece bore before measurement to avoid false readings caused by chips or coolant residue. Never force the gage into a hole; apply light, consistent hand pressure only to protect both the gage and the part.