Spi 29-079-1 Class Zz Plus Plug Gage 0.079 in

Product Description

The SPI 29-079-1 is a Class ZZ Plus plug gage used to verify bore and hole diameters to a precise 0.079-inch nominal size. It holds a tolerance of 0.0002 inches, making it appropriate for quality-control and inspection work where tight dimensional accuracy is required. Machined from steel, this gage is a standard go/no-go inspection tool used by machinists, toolroom technicians, and quality engineers to confirm hole sizes meet drawing specifications on production parts.

This plug gage is suited for use in machine shops, toolrooms, and manufacturing inspection environments where small-diameter bores must be validated. At 0.079 inches nominal diameter, it covers small precision holes common in close-tolerance mechanical assemblies. Class ZZ Plus gages are typically used for checking finished or semi-finished workpieces during in-process or final inspection.

Key Features

• 0.079-inch nominal measurement diameter for small precision bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable dimensional verification
• Steel construction for durability and dimensional stability in shop environments
• Compact, single-piece form factor suited for hand-held inspection use

Compatibility

Designed as an OEM-style inspection gage for use in standard go/no-go plug gage applications requiring a 0.079-inch nominal diameter check.

Installation Notes

Plug gages should be handled with clean, dry hands or cotton inspection gloves to prevent corrosion from skin oils that can affect dimensional accuracy. Store the gage in its case or a protected location away from other tooling to prevent nicks or surface damage. Clean the gage and the bore being checked before use to remove chips, oil, or debris that could produce false readings. Periodic recalibration against NIST-traceable standards is recommended to maintain measurement integrity.