Spi 29-754-9 Class Zz Plus Plug Gage 0.754 in

Product Description

The SPI 29-754-9 is a Class ZZ Plus plug gage designed to verify bore diameters to a nominal size of 0.754 inches. It holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection of machined holes and bored features where dimensional accuracy is critical. Constructed from steel, this gage provides the wear resistance and stability required for repeated use in production and quality-control environments. Machinists, toolroom technicians, and quality inspectors use plug gages like this one to confirm that drilled, reamed, or bored holes meet print specifications before parts move to assembly.

Class ZZ Plus plug gages are intended for general-purpose inspection of production parts. This gage is well suited for checking hole tolerances in manufacturing facilities, machine shops, and job shops where steel, aluminum, or similar machinable materials are being processed. It is typically used as a no-go member in a matched gage set or as a standalone check against a known diameter specification. The compact size and low weight of 0.2 pounds make it easy to handle at the machine or inspection bench.

Key Features

• Nominal measurement diameter of 0.754 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go inspection
• Steel construction for durability and dimensional stability under repeated use
• Lightweight at 0.2 pounds for easy one-handed handling at the machine or bench
• Single-piece package quantity suited for individual inspection station use

Compatibility

Designed as an OEM-style Class ZZ Plus plug gage for use in standard go/no-go bore inspection applications where a 0.754-inch nominal diameter is required.

Installation Notes

Plug gages are handled and used by machinists, toolroom staff, and quality-control technicians. Before use, clean the gage and the bore being checked to remove chips, coolant, and debris that could affect the reading. Do not force the gage into a hole; forced insertion can damage the gage surface and give a false reading. Store the gage in its protective case when not in use to prevent wear, corrosion, and accidental damage that would affect calibration.