Spi 19-343-3 Class Zz Minus Plug Pin Gage 0.343 in

Product Description

The SPI 19-343-3 is a Class ZZ minus plug pin gage with a nominal diameter of 0.343 inches, manufactured from steel. It is used to verify that a hole or bore meets minimum dimensional tolerance requirements. Class ZZ is the most commonly specified tolerance grade for go/no-go inspection work in general manufacturing and machining environments. This gage carries a tolerance of 0.000200 inches (minus direction), meaning the gage is manufactured below nominal to confirm minimum material condition. Machinists, quality technicians, and tool-and-die professionals use plug gages like this one during in-process and final inspection.

This pin gage is suited for inspection of drilled, reamed, or bored holes where a 0.343-inch nominal diameter is the target dimension. It fits standard gage handle systems and is appropriate for use on production floors, in inspection rooms, and at receiving inspection stations. The steel construction holds up under repeated use in shop environments. It is a single-ended gage intended for go or no-go checking in light to medium production volumes.

Key Features

• Class ZZ tolerance grade for general-purpose dimensional inspection
• Minus designation confirms minimum material condition of bored or drilled holes
• 0.000200-inch tolerance for consistent, repeatable measurement
• Steel construction for durability in production and inspection environments
• Compatible with standard plug gage handles for easy integration into existing tool sets

Compatibility

Designed as an OEM-style replacement or direct addition to standard plug gage handle sets used in general machining and inspection applications at the 0.343-inch nominal diameter.

Installation Notes

Plug pin gages are handled and used by machinists and quality control technicians and do not require power tools or mechanical installation. Store the gage in a protective case when not in use to prevent damage to the precision ground surface. Clean the gage and the workpiece bore before inspection to avoid false readings caused by chips or debris. Follow your facility calibration schedule and applicable metrology standards to maintain traceability.