Spi 19-900-0 Class Zz Minus Plug Pin Gage 0.9 in Steel

Product Description

The SPI 19-900-0 is a Class ZZ minus plug pin gage used to verify bore and hole dimensions in precision machining and inspection work. Manufactured from steel, this pin gage measures 0.9 inches in diameter and holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection of machined bores, drilled holes, and reamed passages. Class ZZ is the standard tolerance class for general-purpose inspection gages in production environments. Machinists, quality control technicians, and tool room personnel use pin gages like this one to confirm dimensional conformance without specialized metrology equipment.

This gage is appropriate for use in production floor inspection, incoming quality control, and tool room verification tasks. It fits into standard pin gage handles and sets for convenient single-hand use. The 0.9-inch diameter range addresses mid-to-large bore inspection needs common in industrial machining, fabrication shops, and component manufacturing environments where dimensional accuracy is critical for assembly fit and function.

Key Features

• Class ZZ tolerance class for general-purpose production inspection
• Minus designation indicates the gage is sized below nominal for go-gage applications
• 0.0002-inch tolerance ensures consistent and repeatable bore verification
• Steel construction for durability and dimensional stability during repeated use
• Compatible with standard pin gage handles for efficient single-hand operation

Compatibility

Designed as an OEM-style replacement or standard addition to Class ZZ plug pin gage sets used with conventional pin gage handles for 0.9-inch diameter bore inspection applications.

Installation Notes

Pin gages should be inserted and withdrawn axially without lateral force to prevent wear on the gage or workpiece bore. Clean and lightly oil the gage before and after use to prevent corrosion and maintain dimensional accuracy. Store pin gages individually or in a protective case to avoid contact damage that could affect tolerances. Inspection personnel should calibrate gages periodically against a certified reference standard to confirm continued accuracy.