Spi 29-320-9 Class Zz Plus Plug Gage 0.32 Inch

Product Description

The SPI 29-320-9 is a Class ZZ Plus plug gage used to verify the dimensional accuracy of machined holes and bores. It measures hole diameters at 0.32 inches with a tolerance of 0.0002 inches, making it a precision inspection tool suited for quality control in machining, manufacturing, and toolroom environments. Constructed from steel, the gage provides the durability and hardness required for repeated use in production or inspection settings. Machinists, quality control technicians, and toolroom professionals rely on this type of gage for go/no-go acceptance checks during in-process and final inspection of drilled, reamed, or bored holes.

The SPI 29-320-9 is intended for use in shop-floor and toolroom inspection applications where hole diameter conformance must be verified against tight tolerances. It is suited for residential and commercial manufacturing environments where small-diameter bore verification is part of a standard quality assurance process. Typical applications include checking reamed holes, verifying drill bit results, and confirming bore size after honing or grinding operations on steel and similar materials.

Key Features

• Class ZZ Plus accuracy grade for reliable go/no-go hole inspection
• 0.32 inch nominal diameter measurement range
• 0.0002 inch tolerance for precise acceptance criteria
• Steel construction for durability and wear resistance in production use
• Compact form factor at 0.2 pounds for easy handling during inspection

Compatibility

Designed as an OEM-style replacement and standard fitment plug gage for inspection of 0.32 inch nominal diameter holes in machined components across general manufacturing and toolroom applications.

Installation Notes

Plug gages are used by machinists and quality control technicians and require no permanent installation. Before use, clean the gage and the workpiece bore of chips, coolant, and debris to ensure accurate measurement. Do not force the gage into an undersized hole, as this can damage the gage or the workpiece. Store the gage in a protected case away from moisture to maintain calibration integrity.