Spi 19-154-4 Class Zz Minus Plug Pin Gage 0.154 in

Product Description

The SPI 19-154-4 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole diameters in precision inspection applications. The gage measures 0.154 inches in diameter and carries a minus tolerance of 0.0002 inches, conforming to Class ZZ standards for go/no-go dimensional verification. It is a hand-held, single-pin tool used by machinists, quality control inspectors, and toolroom technicians to confirm that a drilled, reamed, or bored hole falls within a specified dimensional range. The steel construction provides durability and wear resistance in shop-floor conditions.

This pin gage is suited for use in machine shops, manufacturing facilities, and quality assurance environments where tight dimensional tolerances must be confirmed before parts advance through production. Class ZZ gages are commonly used for inspection of non-critical tolerance work and for incoming or final part verification. The 0.154-inch diameter is typical for small bore and hole-checking tasks in light mechanical assemblies, tooling fixtures, and similar applications.

Key Features

• Class ZZ minus tolerance rating for standardized go/no-go inspection
• 0.154-inch nominal diameter for small bore verification
• Tolerance of 0.0002 inches for consistent, repeatable measurement
• Steel construction for shop-floor durability and dimensional stability
• Single-piece plug pin design for straightforward handheld use

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with compatible pin gage handles and sets in general-purpose dimensional inspection applications.

Installation Notes

Pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils that can affect measurement accuracy. Before use, verify that the gage and the part being checked are at the same temperature to avoid thermal expansion error. Store the gage in a protective case when not in use to prevent surface damage. No power tools or mechanical force should be applied — pin gages are inserted by hand only.