Spi 19-686-5 Class Zz Minus Plug Pin Gage 0.686 in

Product Description

The SPI 19-686-5 is a Class ZZ minus plug pin gage with a nominal diameter of 0.686 inches, manufactured from steel for durability and dimensional stability. This gage is designed to verify hole diameter by checking whether a bore falls within acceptable tolerance limits. Class ZZ gages are the most commonly used go/no-go style in production inspection environments. The minus designation indicates the gage is manufactured to the lower end of the tolerance range, making it suitable for checking minimum bore acceptance criteria. With a tolerance of 0.000200 inches, this pin delivers reliable precision for standard-tolerance inspection work.

Pin gages of this type are used across machine shops, manufacturing facilities, and quality control departments for incoming and in-process inspection. The 0.686-inch diameter is suited for checking bored, drilled, or reamed holes in metal, plastic, and composite workpieces where dimensional conformance is required. Machinists, toolmakers, and QC inspectors working with production parts are the primary users of this gage. It is equally applicable in job shops and high-volume manufacturing environments where consistent hole verification is part of the standard inspection process.

Key Features

• Class ZZ tolerance class for standard production inspection use
• Minus plug designation for lower-limit bore verification
• 0.000200 inch tolerance for reliable dimensional checking
• Steel construction for wear resistance and long service life
• 0.686 inch nominal diameter for mid-range bore inspection

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with compatible gage handle sets in production and quality control inspection applications where 0.686 inch nominal bore verification is required.

Installation Notes

Pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store the gage in its protective case when not in use to avoid contact damage to the precision-ground surface. Before use, verify the gage and workpiece are at the same ambient temperature to eliminate thermal expansion errors. Periodic cleaning and re-oiling with a light instrument oil will maintain accuracy and extend service life.