Spi 19-691-5 Class Zz Minus Plug Pin Gage 0.691 in

Product Description

The SPI 19-691-5 is a Class ZZ minus plug pin gage designed to verify hole diameter acceptance in precision machining and quality control applications. This pin gage measures 0.691 inches in diameter and holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection routines where dimensional accuracy is critical. Constructed from steel, the 19-691-5 is built for repeated use in shop floor and inspection room environments. Machinists, toolmakers, and quality control inspectors rely on this class of gage to confirm bore sizes meet specified tolerances before parts advance to the next stage of production.

Class ZZ minus plug gages are used in general-purpose inspection of drilled, reamed, or bored holes in metal and non-metal workpieces. They are commonly found in manufacturing facilities, job shops, and maintenance environments where consistent hole sizing must be verified. The minus designation indicates the gage is ground below nominal diameter, making it appropriate for checking that a hole is not undersized. This gage is well suited to medium-volume inspection work where tight process control is maintained.

Key Features

• 0.691 inches nominal diameter for direct hole inspection at that size
• Class ZZ tolerance class for general-purpose go/no-go inspection
• Minus designation ground below nominal for undersized bore verification
• 0.0002 inches tolerance for dependable dimensional accuracy
• Steel construction for durability under repeated use
• Lightweight at 0.2 pounds for easy handling during inspection

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for inspecting 0.691-inch nominal diameter bores in machined components across manufacturing, fabrication, and maintenance applications.

Installation Notes

Plug pin gages are used by machinists and quality control inspectors and require no installation in the traditional sense. Clean both the gage and the bore being inspected before use to prevent contamination from affecting measurement accuracy. Store the gage in its protective case when not in use to prevent damage to the precision ground surface. Calibration against traceable standards should be performed periodically per your facility quality plan.