Spi 19-389-6 Class Zz Minus Plug Pin Gage 0.389 in

Product Description

The SPI 19-389-6 is a Class ZZ minus plug pin gage machined from steel, designed for go/no-go inspection of hole diameters in precision manufacturing and quality-control applications. The gage checks a nominal 0.389-inch diameter and holds a minus tolerance of 0.0002 inches, placing it within Class ZZ limits suitable for production-floor inspection work. Technicians and quality inspectors use pin gages to verify drilled, reamed, or punched hole sizes quickly and consistently without the setup time required by adjustable gaging instruments.

Class ZZ pin gages are the standard choice for general-purpose dimensional inspection in machine shops, fabrication facilities, and assembly operations. This single gage covers a 0.389-inch nominal diameter and is appropriate for checking bore and hole acceptance in steel, aluminum, plastic, and other workpiece materials. It is typically used as part of a set or individually when a specific diameter requires routine inspection. The minus designation means the gage is manufactured undersized relative to nominal, consistent with go-gage practice.

Key Features

• Class ZZ tolerance class for general production-floor hole inspection
• Minus designation for go-gage dimensional compliance
• 0.0002-inch tolerance for reliable, repeatable diameter checking
• Steel construction for durability and wear resistance under regular use
• 0.389-inch nominal diameter covers common drilled and reamed hole sizes

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with any compatible pin gage handle sized for 0.389-inch diameter members, and suited for general hole-inspection applications across production and quality-assurance environments.

Installation Notes

Pin gages are handled and used by quality-control technicians and machinists; no special tools are required beyond a clean, lint-free cloth for handling. Always clean the gage and the workpiece bore before inspection to prevent false readings caused by debris or oil film. Avoid forcing the gage into an undersized hole, as this can damage the gage surface and compromise accuracy. Store pin gages in a protective case away from other tools to prevent nicking or corrosion.