Spi 19-921-6 Class Zz Minus Plug Pin Gage 0.921 in

Product Description

The SPI 19-921-6 is a Class ZZ minus plug pin gage designed to verify bore and hole diameters with precision in manufacturing, machining, and quality-control environments. Built from steel, this go/no-go style gage checks a nominal diameter of 0.921 inches with a tolerance of 0.0002 inches, placing it within the Class ZZ specification for dimensional inspection tools. Machinists, tool-and-die technicians, and quality assurance professionals use plug pin gages like this one to confirm that drilled, reamed, or bored features meet print tolerances before parts move to the next stage of production.

This gage is suited for incoming inspection, in-process gauging, and final inspection of hole diameters in precision-machined components. It is appropriate for both job-shop and production-floor environments where repeatable, traceable hole verification is required. The minus designation means the gage is manufactured to the lower half of the tolerance band, making it a standard choice for checking minimum material condition on female features.

Key Features

• Nominal measurement diameter of 0.921 inches for precision bore verification
• Class ZZ tolerance of 0.0002 inches ensures repeatable dimensional checks
• Minus designation targets the lower tolerance band for minimum material condition inspection
• Steel construction provides durability and wear resistance in shop environments
• Single-piece package quantity suits individual replacement and toolbox stocking

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with any handle or gage holder accepting a 0.921-inch diameter pin, consistent with common plug gage handle systems used in precision metrology applications.

Installation Notes

Plug pin gages are handled and stored by metrology or quality technicians following standard gage calibration procedures. Keep the gage clean and lightly oiled when not in use to prevent corrosion. Do not force the gage into a bore; apply only light, even hand pressure to avoid false readings or gage damage. Calibration intervals should follow the facility's quality management plan and applicable metrology standards.