Spi 19-876-2 Class Zz Minus Plug Pin Gage 0.876 in

Product Description

The SPI 19-876-2 is a Class ZZ minus plug pin gage machined for dimensional inspection work in tool rooms, machine shops, and quality control environments. It measures 0.876 inches in diameter and is manufactured from steel to provide consistent wear resistance during repeated use. The minus tolerance designation means the gage is ground to the low side of the nominal dimension, following standard GO gage convention. The tolerance is held to 0.000200 inches, making it suitable for verifying hole diameters to close-tolerance specifications. Machinists, quality technicians, and tool and die professionals use plug pin gages as a fast, reliable method for checking drilled, reamed, or bored features.

This gage is used to verify that a hole or bore meets its minimum acceptable diameter before a part advances in the production process. It is appropriate for use on both ferrous and non-ferrous workpieces across a range of industries including manufacturing, aerospace, and general machining. The 0.876-inch size fits mid-range bore inspection tasks where a plain cylindrical gage offers the most direct measurement method. It is typically used as part of a GO/NO-GO gage set or as a standalone check for a specific feature dimension.

Key Features

• Class ZZ tolerance class for general-purpose inspection and production use
• Minus designation grinds the gage to the low side of nominal for GO gage application
• 0.000200-inch tolerance ensures repeatable, close-tolerance hole verification
• Steel construction provides durability and resistance to wear over repeated insertions
• 0.876-inch nominal diameter covers mid-range bore inspection requirements

Compatibility

Designed as a standard plain plug pin gage for use in any GO or GO/NO-GO gage application requiring a 0.876-inch nominal hole diameter check.

Installation Notes

Plain plug pin gages do not require installation but should be handled and stored carefully to prevent damage to the ground surface. Clean the gage and the workpiece bore before use to avoid false readings caused by chips or debris. Inspect the gage periodically for wear or surface damage, and re-calibrate or replace when the diameter falls outside its specified tolerance band. Gages should be stored in a protective case away from humidity and contact with other metal tools.