Spi 19-844-0 Class Zz Minus Plug Pin Gage 0.844 in

Product Description

The SPI 19-844-0 is a Class ZZ minus plug pin gage machined from steel and sized to a nominal diameter of 0.844 inches. It is used to verify bore and hole dimensions in manufacturing, machining, and inspection environments. The minus tolerance designation means the gage is manufactured undersized relative to the nominal dimension, holding a tolerance of 0.0002 inches. This gage is handled by quality control technicians, machinists, and metrology professionals performing go/no-go inspection routines on drilled, reamed, or bored features.

Class ZZ plug gages are the most commonly specified grade for general-purpose inspection work in production shops and inspection departments. The 0.844-inch diameter makes this gage suitable for checking holes in a range of machined components where dimensional accuracy is critical to assembly fit and function. It is used across metalworking, fabrication, and precision manufacturing operations.

Key Features

• Class ZZ tolerance grade for general-purpose hole inspection
• Minus designation — manufactured undersized to nominal 0.844 inches diameter
• Tolerance of 0.0002 inches for reliable dimensional verification
• Steel construction for durability in production environments
• Single-piece gage suitable for go/no-go inspection routines

Compatibility

Designed as a general-purpose Class ZZ minus plug gage for verifying 0.844-inch nominal diameter bores and holes in standard machining and inspection applications.

Installation Notes

Plug pin gages are handled by trained inspection and metrology personnel. Clean the gage and the bore being checked before use to prevent debris from affecting readings. Do not force the gage into a hole — if resistance is encountered, the bore may be undersized or contain burrs that require correction. Store gages in a protective case away from moisture to prevent corrosion and preserve dimensional integrity.