Spi 19-570-1 Class Zz Minus Plug Pin Gage 0.57 in

Product Description

The SPI 19-570-1 is a Class ZZ minus plug pin gage used to verify hole diameters and bore tolerances in precision machining and inspection applications. It measures 0.57 inches in diameter and holds a tolerance of 0.0002 inches, making it suitable for go/no-go gauging workflows where dimensional accuracy is critical. Constructed from steel, this gage provides the rigidity and wear resistance required for repeated use in shop-floor and quality-control environments. Machinists, toolmakers, and quality inspectors use plug pin gages like this one to confirm that drilled, reamed, or bored holes fall within specified dimensional limits.

This gage is intended for use in precision measurement and inspection tasks across manufacturing, metalworking, and tool-and-die operations. The Class ZZ designation indicates a working-grade gage appropriate for general production inspection rather than master or reference standards. It is suited for verifying hole sizes in ferrous and non-ferrous workpieces where a tolerance of 0.0002 inches must be maintained. The minus configuration means the gage is manufactured to the lower end of the nominal diameter, consistent with standard go-gage practice.

Key Features

• 0.57 inch nominal diameter for direct hole verification at that size
• Class ZZ working-grade tolerance of 0.0002 inches
• Minus designation conforms to standard go-gage dimensional convention
• Steel construction provides durability and dimensional stability under repeated use
• Compact, single-piece design integrates into standard pin gage handle sets

Compatibility

Designed as a working-grade Class ZZ minus plug pin gage for use in standard pin gage handle sets that accept 0.57 inch diameter gage pins.

Installation Notes

Plug pin gages are handled and used by machinists, toolmakers, and quality inspectors following shop metrology procedures. Clean and lightly oil the gage pin before and after use to prevent corrosion and maintain dimensional integrity. Do not force the pin into a hole; light hand pressure is sufficient for a go/no-go check. Store the gage in a protective case away from heat sources to prevent thermal expansion that could affect measurement accuracy.