Spi 19-171-8 Class Zz Minus Plug Pin Gage 0.171 in

Product Description

The SPI 19-171-8 is a Class ZZ minus plug pin gage used to verify bore and hole dimensions in precision machining and inspection work. It measures 0.171 inches in diameter and is manufactured from steel to withstand repeated use in shop and quality-control environments. The minus tolerance designation means the gage is ground to the low side of the nominal dimension, which is standard practice for go-gage applications. With a tolerance of 0.0002 inches, this gage delivers reliable dimensional verification for tight-tolerance work. It weighs approximately 0.2 pounds and is suited for use by machinists, tool and die makers, and quality inspectors.

Class ZZ plug pin gages are commonly used in general-purpose inspection of drilled, reamed, or bored holes in manufacturing and fabrication settings. This gage is appropriate for both production floor checks and incoming inspection tasks where a quick, reliable pass-fail check of a 0.171-inch diameter hole is needed. It is a standard hand tool that requires no calibration equipment to use and fits into most gage handle sets designed for pin gages of this diameter range.

Key Features

• Class ZZ tolerance class for general-purpose hole inspection
• Minus designation ground to the low side of nominal for go-gage use
• 0.0002-inch tolerance for precise dimensional verification
• Steel construction for durability in shop environments
• 0.171-inch nominal diameter for direct bore and hole checking
• Lightweight at 0.2 pounds for easy single-hand operation

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with compatible gage handle sets sized for the 0.171-inch diameter range. Suitable for general-purpose inspection of holes and bores at this nominal dimension.

Installation Notes

Pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Insert the gage into the bore with light, steady hand pressure only — never force a pin gage with tools or excessive pressure. Store in a protective case away from other metal tools to prevent surface damage that could affect accuracy. Periodic cleaning and light oil application will help maintain gage life and measurement integrity.