Spi 29-645-9 Class Zz Plus Plug Gage 0.645 in Dia

Product Description

The SPI 29-645-9 is a Class ZZ Plus plug gage designed to verify bore diameters with a nominal measurement size of 0.645 inches and a tolerance of 0.0002 inches. Built from steel, this gage is used in go/no-go dimensional inspection to confirm that machined holes or bored features meet tight toleranced specifications. Machinists, quality control technicians, and toolroom professionals rely on plug gages like this one during in-process and final inspection of precision-machined components.

This plug gage is suited for shop floor and inspection room environments where accurate bore verification is required. The Class ZZ Plus designation indicates a higher tolerance class appropriate for inspection-grade measurement work on production machined parts. It is well suited for use in metalworking, manufacturing, and precision fabrication shops where consistent hole sizing must be confirmed across repeated production runs.

Key Features

• Nominal measurement diameter of 0.645 inches for precise bore verification
• Tolerance of 0.0002 inches, meeting Class ZZ Plus inspection-grade standards
• Steel construction for durability and dimensional stability under regular shop use
• Compact and lightweight at 0.2 pounds for easy handling during inspection tasks
• Single-piece package quantity suited for individual toolroom or bench use

Compatibility

Designed as an inspection-grade plug gage for verifying 0.645-inch nominal diameter bores in precision-machined components across metalworking and manufacturing applications.

Installation Notes

Plug gages are used by quality control technicians and machinists and require no installation in the traditional sense. Before use, clean both the gage and the bore being checked to remove chips, coolant, or debris that could affect measurement accuracy. Handle the gage carefully to avoid dropping or contact with abrasive surfaces, as damage to the gage surface will compromise dimensional accuracy. Store in a protected case when not in use to maintain calibration integrity.