Spi 19-314-4 Class Zz Minus Plug Pin Gage 0.3140 in

Product Description

The SPI 19-314-4 is a Class ZZ minus plug pin gage machined from steel, designed for go/no-go dimensional inspection of holes and bores measuring 0.3140 inches in diameter. With a tolerance of 0.0002 inches, this gage delivers the precision required for quality control in machining, fabrication, and assembly environments. The minus designation means the gage is manufactured to the lower end of the tolerance band, making it suitable for checking minimum acceptable hole size. Machinists, quality technicians, and toolroom professionals rely on Class ZZ gages for production-floor inspection tasks where calibrated accuracy is essential.

This plug pin gage is used in manufacturing and industrial settings to verify hole diameters during in-process or final inspection. It is appropriate for ferrous and non-ferrous workpieces where a 0.3140-inch bore must be confirmed to spec. Typical applications include CNC machined parts, stamped components, and precision assemblies across aerospace, automotive, and general manufacturing trades. The steel construction provides durability for repeated use in shop environments.

Key Features

• Class ZZ minus tolerance for lower-limit hole inspection
• 0.3140-inch nominal diameter for precise bore verification
• 0.0002-inch tolerance for accurate dimensional control
• Steel construction for durability in production environments
• Single-piece package suitable for individual or toolroom use

Compatibility

Designed as a standard Class ZZ minus plug pin gage for go/no-go inspection of 0.3140-inch diameter holes in production and quality control applications.

Installation Notes

Plug pin gages are handled and used by quality control technicians and machinists. Keep the gage clean and lightly oiled when not in use to prevent corrosion. Do not force the gage into a bore; excessive insertion force can damage both the gage and the workpiece. Store in a protective case away from temperature extremes to maintain calibration integrity.