Spi 19-845-7 Class Zz Minus Plug Pin Gage 0.845 in

Product Description

The SPI 19-845-7 is a Class ZZ minus plug pin gage used to verify the dimensional accuracy of holes and bores in machined components. With a nominal diameter of 0.845 inches and a minus tolerance of 0.0002 inches, this gage allows machinists and quality control technicians to confirm that a hole falls within its specified tolerance range. Constructed from steel, the 19-845-7 is built for repeated use in shop-floor and inspection environments. Class ZZ is the standard tolerance class for general-purpose go and no-go gage applications in production and maintenance settings.

This plug pin gage is suited for use in machine shops, manufacturing facilities, and maintenance departments where accurate bore inspection is required. It is commonly used during incoming inspection, in-process quality checks, and final part verification. The 0.845-inch diameter makes it appropriate for inspecting holes produced by drilling, reaming, or boring operations where tight dimensional control is specified.

Key Features

• Class ZZ tolerance class — standard for general-purpose plug gage applications
• Minus designation confirms the gage is ground to the lower boundary of the tolerance range
• 0.0002-inch tolerance for precise dimensional verification
• Steel construction for durability in production and inspection environments
• 0.845-inch nominal diameter for bore and hole inspection

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use with standard go and no-go gage handles sized to accept 0.845-inch diameter pin gages.

Installation Notes

Plug pin gages are handled and used by machinists, quality technicians, and metrologists — no power tools or electrical shutoff procedures apply. Store the gage in a protective case when not in use to prevent surface damage that could affect measurement accuracy. Allow the gage and the workpiece to reach the same ambient temperature before inspection to avoid thermal expansion errors. Do not force the gage into a hole; if resistance is felt, the bore is likely undersize.