Spi 29-961-0 Class Zz Plus Plug Gage 0.961 in Dia

Product Description

The SPI 29-961-0 is a Class ZZ Plus plug gage designed to verify the inside diameter of machined holes and bores to a nominal size of 0.961 inches. Manufactured from steel, this fixed-limit gage delivers a tolerance of 0.0002 inches, making it appropriate for general-purpose inspection tasks in production and maintenance environments. Machinists, quality control technicians, and tool-and-die professionals use plug gages like this one to quickly confirm whether a hole falls within acceptable dimensional limits. It provides a simple go or no-go reference without requiring a measuring instrument readout.

This plug gage is suited for shop-floor inspection of drilled, reamed, or bored holes in metalworking, fabrication, and manufacturing applications. It is commonly used where repeatable, fast hole verification is required during production runs or incoming inspection. The Class ZZ Plus designation indicates a commercial-grade tolerance class appropriate for general inspection rather than master or reference gage use. Weighing 0.2 pounds, it is compact and easy to handle at the workbench or inspection station.

Key Features

• Nominal measurement diameter of 0.961 inches for precise hole verification
• Tolerance of 0.0002 inches meets Class ZZ Plus commercial-grade requirements
• Steel construction provides durability and dimensional stability under shop conditions
• Compact form factor at 0.2 pounds for easy single-hand use
• Fixed-limit design allows fast pass or fail inspection without instrument readout

Compatibility

Designed as a standard fixed-limit plug gage for general inspection of 0.961-inch nominal diameter holes in machined components across metalworking and manufacturing applications.

Installation Notes

Plug gages should be handled and stored carefully to prevent nicks, burrs, or corrosion that would affect measurement accuracy. Clean the gage and the hole being checked before use to remove chips, coolant, or debris. Do not force the gage into a hole; apply only light hand pressure to avoid false readings or gage wear. Periodic calibration against a reference standard is recommended to confirm the gage remains within its stated tolerance class.