Spi 29-514-7 Class Zz Plus Plug Gage 0.514 in Steel

Product Description

The SPI 29-514-7 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.514 inches. Built from steel, this gage delivers a tolerance of 0.0002 inches, making it suitable for go/no-go dimensional inspection work in machine shops, manufacturing facilities, and maintenance environments. Class ZZ Plus gages are commonly used for less critical inspection applications where a cost-effective, reliable reference tool is required. Machinists, quality technicians, and tool-room professionals use plug gages like this one to confirm that machined bores and drilled holes fall within acceptable dimensional limits.

This plug gage is appropriate for inspection of holes and bores nominally sized at 0.514 inches across a range of light manufacturing, maintenance, and quality-control applications. It is well suited to both production floor use and tool-room inspection. The compact size and low weight of 0.2 pounds make it easy to handle during routine checks. Standard single-piece packaging makes it straightforward to add to an existing gage kit or replace a worn reference tool.

Key Features

• Nominal measurement diameter of 0.514 inches for direct bore verification
• Tolerance of 0.0002 inches meets Class ZZ Plus gage standards
• Steel construction provides durability for repeated production use
• Lightweight at 0.2 pounds for easy single-hand operation
• Single-piece unit — no assembly required before use

Compatibility

Designed as an OEM-style reference gage for verifying bores and holes with a nominal diameter of 0.514 inches in standard go/no-go inspection applications.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and tool-room personnel — no power tools or utility shutoffs are required for use. Store the gage in a clean, dry location away from contaminants to preserve the calibrated surface finish and dimensional accuracy. Do not force the gage into an undersized bore, as this can damage both the gage and the workpiece. Periodic calibration against a traceable reference standard is recommended to maintain measurement integrity.