Spi 19-350-8 Class Zz Minus Plug Pin Gage 0.35 in

Product Description

The SPI 19-350-8 is a Class ZZ minus plug pin gage designed for dimensional inspection of hole diameters in precision machining and quality control applications. Built to a minus tolerance of 0.0002 inches, this gage checks whether a bored, drilled, or reamed hole falls within the low side of its specified tolerance band. The steel construction provides durability for repeated use in shop-floor inspection environments. At 0.35 inches in diameter, it fits a common range of machined hole sizes encountered in metalworking, tooling, and mechanical assembly workflows.

This plug gage is suited for machinists, quality technicians, and toolroom professionals performing go/no-go inspection or dimensional verification in manufacturing and fabrication settings. It is appropriate for use in job shops, production floors, and toolrooms where hole diameter conformance must be confirmed before parts advance to assembly. The compact size and steel body make it practical for both bench inspection and in-process checking at the machine.

Key Features

• Class ZZ tolerance classification for general-purpose hole inspection
• Minus tolerance of 0.0002 inches for low-side dimensional checking
• 0.35 inch nominal diameter for common machined hole sizes
• Steel construction for durability in shop-floor environments
• Compact, single-piece gage format for quick in-process checks

Compatibility

Designed as an OEM-style plug pin gage for use in standard precision inspection applications requiring Class ZZ dimensional verification of 0.35 inch nominal diameter holes.

Installation Notes

Plug pin gages are handled by quality technicians and machinists and require no permanent installation. Before use, clean the gage and the hole being inspected to remove chips, oil, and debris that could affect measurement accuracy. Apply light hand pressure only when inserting the gage into the hole. Store the gage in a protective case away from other tooling to prevent surface damage that would affect calibration.