Spi 22-178-8 Class Zz Plug Gage Set 55 Pc Nist Traceable

Product Description

The SPI 22-178-8 is a 55-piece Class ZZ plug gage set covering a diameter range of 0.2 mm to 1.28 mm with a minus tolerance of 0.005 mm. Designed for precision inspection work, the set allows technicians and quality control professionals to quickly measure hole sizes, check slot widths, and calculate distances between holes. Each pin is manufactured to Class ZZ standards, making this set suitable for production-floor inspection and incoming-goods verification. The set includes a pin gage holder and a Certificate of Accuracy with NIST Traceability, supporting documented quality programs. Total package weight is 1.1 pounds.

This plug gage set is used in machine shops, manufacturing facilities, and quality inspection labs where small-bore measurement accuracy is critical. It is well suited for inspecting drilled, reamed, or punched holes in the sub-1.3 mm range. The NO-GO gaging capability supports both attribute inspection and dimensional verification. Machinists, toolmakers, metrologists, and QC inspectors working to tight tolerances will find this set practical for day-to-day measurement tasks on small components and precision assemblies.

Key Features

• 55-piece set covering 0.2 mm to 1.28 mm diameter range
• Class ZZ tolerance rating with minus tolerance of 0.005 mm
• Supports hole size measurement, slot width measurement, and NO-GO gaging inspection
• Includes Certificate of Accuracy backed by NIST Traceability
• Pin gage holder included for organized storage and quick access
• Compact package dimensions: 8.46 inches long, 6.3 inches wide, 2.64 inches tall

Compatibility

Designed as a general-purpose Class ZZ plug gage set for use with standard pin gage holders and inspection fixtures that accept small-diameter pins in the 0.2 mm to 1.28 mm range.

Installation Notes

Handle individual pins with care to avoid nicks or contamination that could affect measurement accuracy. Clean pins with a lint-free cloth before and after use, and apply a light coat of instrument oil for storage. Keep the set away from impact or dropping, as Class ZZ pins are precision ground and can be damaged easily. Calibration and periodic re-verification against a NIST-traceable standard is recommended as part of any formal quality management program.