Spi 29-156-7 Class Zz Plus Plug Gage 0.156 in

Product Description

The SPI 29-156-7 is a Class ZZ Plus plug gage designed for precision go/no-go inspection of 0.156-inch diameter bores and holes. Manufactured from steel, this gage provides a tolerance of 0.0002 inches, making it suitable for quality control work in machine shops, manufacturing facilities, and maintenance environments. It is used to verify that drilled, reamed, or bored holes fall within acceptable dimensional limits. Metrology technicians, machinists, and quality inspectors are the primary users of this tool in production and inspection settings.

This plug gage is suited for inspecting small-diameter holes in both light and heavy manufacturing applications. It performs well in environments where consistent, repeatable bore verification is required as part of an in-process or final inspection routine. The compact size and low mass of 0.2 pounds make it easy to handle for bench or floor-level inspection tasks.

Key Features

• Class ZZ Plus tolerance class for reliable go/no-go hole inspection
• 0.156-inch measurement diameter for small bore applications
• 0.0002-inch tolerance for high-accuracy dimensional verification
• Steel construction for durability and wear resistance
• Lightweight at 0.2 pounds for easy one-handed use

Compatibility

Designed as a standard Class ZZ Plus plug gage for go/no-go inspection of 0.156-inch nominal diameter bores across general manufacturing and machining applications.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and metrologists — no installation in the traditional sense is required. Before use, clean both the gage and the bore being inspected to remove chips, oil, and debris that could affect measurement accuracy. Store the gage in its protective case when not in use to prevent damage to the precision ground surfaces. Calibrate and verify the gage periodically against traceable standards in accordance with your facility's quality management procedures.