Spi 22-168-9 Class Zz Plug Gage Set 0.833-0.916 in 84 Pc

Product Description

The SPI 22-168-9 is a Class ZZ plug gage set designed for precise hole measurement, slot width inspection, and distance-between-hole calculations in machining, manufacturing, and quality-control environments. The set covers a diameter range of 0.833 to 0.916 inches with a minus tolerance of 0.0002 inches per NIST traceable standards. With 84 individual steel pin gages included, this set gives metrology technicians and machinists a comprehensive range of GO and NO-GO inspection references in a single package. A Certificate of Accuracy with NIST traceability and a pin gage holder are included with every set.

This plug gage set is suited for incoming inspection, in-process quality checks, and final inspection applications in precision machine shops, tool rooms, and manufacturing facilities. It is appropriate for both production-floor use and controlled metrology lab environments. The Class ZZ tolerance classification makes it appropriate for working-gage applications where repeatable, accurate hole and slot sizing is required. Licensed metrology technicians, quality engineers, and skilled machinists are the primary installers and users of this tooling.

Key Features

• Class ZZ tolerance rating at 0.0002 inches (minus tolerance) for working-gage inspection use
• Covers 0.833 to 0.916 inches diameter range in a single 84-piece set
• Steel construction for durability and dimensional stability across repeated use cycles
• NIST traceable Certificate of Accuracy included for documentation and traceability requirements
• Pin gage holder included for organized storage and quick access during inspection tasks
• Suitable for hole sizing, slot width measurement, and distance-between-hole calculations

Compatibility

Designed as a working-gage plug gage set for use with standard pin gage holders and compatible with inspection procedures requiring Class ZZ tolerance gaging in the 0.833 to 0.916 inch diameter range.

Installation Notes

Pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store gages in the provided holder when not in use to prevent damage to the precision ground surfaces. Clean and lightly oil steel pin gages periodically per the manufacturer recommendations to maintain dimensional accuracy. Verify gage condition against the Certificate of Accuracy before placing the set into service and re-certify at intervals consistent with your quality management program.