Spi 19-327-6 Class Zz Minus Plug Pin Gage 0.327 in

Product Description

The SPI 19-327-6 is a Class ZZ minus plug pin gage used to verify hole diameters and bore tolerances in precision machining and inspection applications. Ground to a nominal diameter of 0.327 inches with a minus tolerance of 0.000200 inches, this gage provides a reliable go/no-go reference for quality control checks. The steel construction delivers the hardness and dimensional stability required for repeated use in shop-floor and inspection-room environments. Machinists, toolmakers, and quality technicians use plug gages like this to confirm that drilled, reamed, or bored holes fall within specified limits before parts move to the next stage of production.

Class ZZ plug gages are the standard working grade used in general manufacturing inspection. This gage is suited for checking hole sizes in ferrous and non-ferrous workpieces across light industrial and production machining settings. The minus designation means the gage is ground below nominal, making it appropriate for go-gage applications where confirming minimum acceptable hole size is the priority. It is handled directly during part inspection and requires no special fixturing for most standard bore-check routines.

Key Features

• Nominal diameter of 0.327 inches for direct bore verification
• Class ZZ minus tolerance of 0.000200 inches for working-grade inspection
• Steel construction provides hardness and dimensional stability under repeated use
• Compact and lightweight at 0.2 pounds for easy handling during inspection
• Single-piece packaging suitable for individual replacement or kit supplementation

Compatibility

Designed as a working-grade plug gage for use in standard bore inspection routines on machined parts requiring a 0.327-inch nominal hole diameter check.

Installation Notes

Plug gages are handled by quality technicians and machinists and require no installation in the traditional sense. Clean the gage and the bore being checked before use to prevent debris from affecting the reading. Store the gage in a protective case away from other tooling to avoid nicks or wear on the ground surface. Periodic re-calibration against a certified master is recommended to confirm gage accuracy over time.