Spi 19-870-5 Class Zz Minus Plug Pin Gage 0.87 in

Product Description

The SPI 19-870-5 is a Class ZZ minus plug pin gage used to verify bore and hole dimensions in precision machining and inspection applications. It measures 0.87 inches in diameter and is manufactured from steel to withstand repeated use in shop-floor environments. The minus tolerance designation means the gage is ground to the low side of the nominal dimension, following standard GO/NO-GO gage practice. With a tolerance of 0.0002 inches, it provides the measurement accuracy required for quality control inspection of machined parts. This type of gage is a standard tool for machinists, quality technicians, and metrology personnel working to print tolerances.

Class ZZ plug gages are suited for general-purpose inspection in production and toolroom settings. This gage is used to check drilled, reamed, or bored holes where dimensional conformance must be verified before assembly or further machining. It is appropriate for both job shop and high-volume production inspection workflows where hole diameter acceptance must be documented or controlled to specification.

Key Features

• Class ZZ tolerance grade for general-purpose dimensional inspection
• Minus plug designation: ground to the low side of nominal for GO gage applications
• 0.0002 inches tolerance for precise bore verification
• 0.87 inch nominal diameter
• Steel construction for durability under repeated handling and shop conditions

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in general-purpose bore and hole inspection across typical machined component tolerances.

Installation Notes

Plug pin gages are handled and used by machinists and quality control inspectors — no power source or system shutdown is required. Store the gage in a protective case when not in use to prevent damage to the precision ground surface. Handle with clean, dry hands or cotton gloves to prevent corrosion from skin contact. Verify the gage against a calibrated reference standard on a regular interval to confirm it remains within calibration.