Spi 19-775-6 Class Zz Minus Plug Pin Gage 0.775 in

Product Description

The SPI 19-775-6 is a Class ZZ minus plug pin gage used to verify hole diameters in machined and fabricated parts. With a nominal diameter of 0.775 inches and a minus tolerance of 0.000200 inches, this gage checks whether a bore or hole falls within the required dimensional limits. The steel construction provides wear resistance and dimensional stability under repeated use. Machinists, quality control technicians, and toolroom personnel use Class ZZ pin gages as part of incoming inspection, in-process verification, and final acceptance routines in manufacturing environments.

Class ZZ pin gages are the standard working-grade gage for general shop use and inspection of production parts. This 0.775-inch diameter gage is suited for checking clearance holes, bores, and similar features in metal, plastic, or composite workpieces. The minus designation means the gage is ground to the lower limit of the nominal diameter, making it appropriate for go or no-go inspection procedures where tight dimensional control is required. It is commonly used in job shops, OEM production lines, and quality labs handling mid-range hole sizes.

Key Features

• Nominal diameter of 0.775 inches for direct hole-size verification
• Class ZZ tolerance grade suitable for general-purpose shop and inspection use
• Minus tolerance of 0.000200 inches ground to the lower nominal limit
• Steel construction for durability and dimensional stability under repeated use
• Compact and lightweight at 0.2 pounds for easy handling at the machine or inspection bench

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general-purpose dimensional inspection of 0.775-inch nominal diameter holes and bores in production and quality control applications.

Installation Notes

Pin gages are used by quality control technicians and machinists and require no installation in the traditional sense. Clean the gage and the workpiece bore before use to prevent debris from affecting the reading. Store pin gages in their original case or a protected holder to avoid surface damage that could compromise accuracy. Periodic calibration against a certified master or traceable standard is recommended to maintain measurement integrity.