Spi 22-188-7 Class Zz Plug Gage Set 55 Piece Nist Traceable

Product Description

The SPI 22-188-7 is a 55-piece Class ZZ plug gage set designed for fast, accurate measurement of hole sizes, slot widths, and center-to-center distances between holes. The set covers a diameter range of 0.2 mm to 1.28 mm with a plus 0.005 mm tolerance, making it suitable for precision inspection work in manufacturing, machining, and quality control environments. Each pin is manufactured to Class ZZ standards, and the set ships with a Certificate of Accuracy traceable to NIST. A pin gage holder is included. Typical users include machinists, quality technicians, and tool-and-die professionals who require reliable GO gage inspection in small-bore applications.

This set is well suited for inspection tasks in precision machining shops, gauge rooms, and production-floor QC stations. It covers applications such as verifying small bore diameters, checking slot widths, and calculating distances between holes. The sub-millimeter diameter range addresses needs that standard gage pin sets do not cover, making it a practical addition to any inspection toolkit that handles micro-bore or miniature-component work.

Key Features

• 55-piece set covering 0.2 mm to 1.28 mm diameter range
• Class ZZ tolerance with plus 0.005 mm accuracy
• Suitable for GO gage inspection, hole sizing, slot width measurement, and hole-spacing calculations
• Includes Certificate of Accuracy with NIST Traceable calibration documentation
• Pin gage holder included for organized storage and field use
• UNSPSC Code 41111600 for procurement and catalog classification

Compatibility

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

Installation Notes

Plug gage sets are used by quality control technicians and machinists and require no installation in the traditional sense, but proper handling is essential to maintain calibration integrity. Store pins in the provided holder to prevent contact damage and corrosion. Clean pins and the workpiece bore before measurement to avoid false readings. Do not force a pin into a hole; resistance without passage indicates the feature is undersize for that pin.