Spi 19-398-7 Class Zz Minus Plug Pin Gage 0.398 in Steel

Product Description

The SPI 19-398-7 is a Class ZZ minus plug pin gage machined to a 0.398 inch nominal diameter with a tolerance of 0.0002 inches. Pin gages are precision measurement tools used to verify hole diameters, check bore sizes, and confirm dimensional conformance during machining, fabrication, and quality inspection operations. Constructed from steel, this gage provides the durability and dimensional stability required for repeated use in shop-floor and inspection environments. The Class ZZ designation indicates a commercial-grade tolerance class suitable for general production inspection and go/no-go verification tasks. Minus designation means the gage is ground below nominal, making it a no-go member in standard plug gage practice.

This pin gage is used by machinists, quality control technicians, tool-and-die makers, and maintenance professionals who need to verify hole tolerances quickly and accurately. It is appropriate for use in metalworking, manufacturing, and mechanical assembly environments where hole diameter confirmation is a routine part of the inspection process. The compact, single-pin format makes it easy to handle and store as part of a larger gage set or individually for a dedicated inspection step.

Key Features

• Class ZZ minus tolerance class for general production and inspection use
• 0.398 inch nominal diameter for direct hole verification at that size
• Tolerance of 0.0002 inches for reliable dimensional conformance checking
• Steel construction for durability and dimensional stability under repeated use
• Single-pin format compatible with standard pin gage handle accessories

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with conventional pin gage handles and accessories sized for 0.398 inch diameter pins in general inspection and production environments.

Installation Notes

Pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils, which can affect dimensional accuracy over time. Store in a protective case away from impact and temperature extremes. Clean the gage and the bore being measured before use to ensure accurate results. Periodic calibration against a traceable standard is recommended to maintain measurement integrity.