Spi 19-166-8 Class Zz Minus Plug Pin Gage 0.166 in

Product Description

The SPI 19-166-8 is a Class ZZ minus plug pin gage used to verify hole diameters and bore tolerances in precision machining and inspection work. At 0.166 inches in diameter with a minus tolerance of 0.000200 inches, this gage is designed to confirm that a hole is at or within its lower dimensional limit. Machined from steel for durability and dimensional stability, it is a go/no-go style reference tool suited for quality control stations, toolrooms, and production floor inspection. Metrologists, machinists, and QC technicians use plug pin gages as part of standard dimensional verification workflows.

Class ZZ plug gages are intended for inspection of general-purpose holes where close but not ultra-precision tolerances are required. The 0.166-inch diameter makes this gage applicable to small-bore inspection tasks common in metal fabrication, mechanical assembly, and manufacturing quality control environments. It is a single-piece pin gage that is hand-held and used in direct insertion checks.

Key Features

• Class ZZ minus tolerance grade for lower-limit hole inspection
• 0.166 inch nominal diameter for small-bore applications
• Minus tolerance of 0.000200 inches for precise dimensional control
• Steel construction for wear resistance and dimensional stability
• Single-piece pin design suitable for hand-held go/no-go checks

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general-purpose dimensional inspection of 0.166-inch nominal diameter holes in machining and manufacturing quality control applications.

Installation Notes

Plug pin gages are handled by metrologists, machinists, and QC inspectors and require no installation in the traditional sense. Clean the gage and the bore being checked before use to prevent debris from affecting readings. Do not force the pin into a hole, as this can damage the gage or workpiece and produce inaccurate results. Store in a protective case away from extreme temperatures to maintain calibration integrity.