Spi 19-304-5 Class Zz Minus Plug Pin Gage 0.304 in

Product Description

The SPI 19-304-5 is a Class ZZ minus plug pin gage designed to verify hole diameters and feature dimensions in precision machining and inspection applications. With a nominal diameter of 0.304 inches and a tolerance of 0.0002 inches (minus), this gage provides reliable go/no-go verification for dimensional quality control. The steel construction delivers the hardness and wear resistance required for repeated use on the shop floor or in a metrology lab. Machinists, quality technicians, and tool-and-die professionals use pin gages like this one to confirm bore sizes, check tooling, and validate production parts against print tolerances.

This plug pin gage is suited for use in manufacturing environments where tight dimensional control is required. Class ZZ is the most common classification for general-purpose inspection of holes and bores in both production and job-shop settings. It is appropriate for checking drilled, reamed, or bored holes in metal, plastic, or composite workpieces. The minus designation indicates the gage is manufactured to the minus side of the nominal diameter, which is standard for go-gage applications where the gage must pass through an acceptable hole.

Key Features

• Nominal diameter of 0.304 inches for direct bore verification at that dimension
• Class ZZ classification for general-purpose shop and inspection use
• Minus tolerance of 0.0002 inches ensures gage falls within accepted go-gage limits
• Steel construction provides hardness and durability for repeated gauging cycles
• Single-piece package ready for immediate use in go/no-go inspection routines

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use in standard pin gage handles and sets accommodating 0.304-inch diameter pins. Compatible with pin gage handle systems that accept this diameter range.

Installation Notes

Pin gages are handled and used by quality technicians and machinists in accordance with standard metrology practices. Store gages in a protective case away from moisture and contaminants to preserve the calibrated surface. Clean the gage and the workpiece bore before use to prevent false readings caused by chips or debris. Handle with care to avoid dropping, as impact can alter the calibrated diameter and render the gage out of tolerance.