Spi 19-412-6 Class Zz Minus Plug Pin Gage 0.412 in

Product Description

The SPI 19-412-6 is a Class ZZ minus plug pin gage machined from steel and designed for go/no-go dimensional inspection of hole diameters. At 0.412 inches nominal diameter with a minus tolerance of 0.0002 inches, this gage provides reliable verification of bore size within tight manufacturing tolerances. Class ZZ is the standard grade for shop-floor inspection use, making this gage appropriate for quality control checks in machining, fabrication, and assembly environments. Machinists, toolroom technicians, and quality inspectors use plug gages like this one as a fast, repeatable method for confirming hole conformance without the need for calibrated measuring instruments at every check.

This gage is suited for shop-floor and inspection bench use wherever a 0.412-inch diameter bore must be verified. Typical applications include checking drilled, reamed, or bored holes in metal, plastic, or composite workpieces. Class ZZ minus plug gages are commonly used in production environments where high volume hole inspection requires a simple pass/fail result. The minus designation means the gage is ground to the lower tolerance boundary, making it suitable for use as a go gage member in a two-gage inspection set.

Key Features

• Class ZZ tolerance grade for general shop-floor dimensional inspection
• Minus tolerance designation: 0.0002 inches below nominal diameter
• 0.412-inch nominal diameter for precise bore verification
• Steel construction for durability under repeated use
• Compact and lightweight at 0.2 pounds for easy handling at the inspection station

Compatibility

Designed as a go-member plug gage for inspection of 0.412-inch nominal diameter bores in standard shop-floor and toolroom quality control applications.

Installation Notes

Plug pin gages are hand-held inspection tools and do not require installation in the conventional sense. Before use, clean both the gage and the bore being inspected to remove chips, coolant, and debris that could affect the reading. Apply a light coat of instrument oil to the gage surface to prevent corrosion and reduce wear during use. Store the gage in its protective sleeve or case when not in use to preserve the ground surface and maintain calibration integrity.