Spi 29-143-5 Class Zz Plus Plug Gage 0.143 Inch

Product Description

The SPI 29-143-5 is a Class ZZ Plus plug gage designed to verify bore and hole diameters with precision in production and inspection environments. Built to a 0.143 inch nominal diameter with a tolerance of 0.0002 inches, this gage delivers reliable go/no-go measurement for tight-tolerance machining work. Constructed from steel for durability and dimensional stability, it is used by machinists, quality control inspectors, and tool room technicians to confirm that drilled, reamed, or punched holes meet specification. Its compact form and precise tolerance class make it well suited for repetitive inspection tasks on the shop floor or in a dedicated gage room.

This plug gage is appropriate for use in precision machining, metal fabrication, and manufacturing quality assurance. It is commonly applied where hole diameter verification is required before assembly or finishing. The 0.143 inch size covers a range of small-bore applications including drilled pilot holes, tapped hole pre-checks, and close-tolerance reamed bores. Licensed metrology technicians and quality inspectors typically incorporate this gage into incoming inspection and in-process verification workflows.

Key Features

• Class ZZ Plus tolerance class for reliable go/no-go inspection of small bores
• Nominal diameter of 0.143 inches for precise small-hole verification
• Tolerance of 0.0002 inches ensures accurate conformance checking
• Steel construction provides wear resistance and long service life
• Compact plug gage form factor suits both shop floor and gage room use

Compatibility

Designed as an OEM-style precision inspection tool for verifying 0.143 inch nominal bore diameters in general manufacturing and machining applications.

Installation Notes

Plug gages should be handled and stored carefully to avoid damage to the gage surfaces, which can affect measurement accuracy. Clean the gage and the bore being checked before use to remove chips, oil, or debris. Do not force the gage into an undersized hole, as this can damage the gage land and compromise accuracy. Periodic calibration against a certified master is recommended to maintain measurement traceability.