Spi 616-62012 Class Zz Plug Gage Set 51 Pc Steel

Product Description

The SPI 616-62012 is a 51-piece Class ZZ double-end plug gage set designed for precision bore and hole measurement in manufacturing, toolroom, and quality-control applications. The set covers a measurement range of 0.0197 to 0.0394 inches (0.500 to 1.00 mm) with a bilateral tolerance of plus or minus 0.002000 inches. Each gage is double-ended, providing two measuring members per handle for increased efficiency during inspection work. The gages are constructed from steel for durability and dimensional stability under typical shop conditions. This set is appropriate for machinists, toolmakers, and quality technicians who require reliable go/no-go verification of small-diameter holes and bores.

This plug gage set is suited for precision inspection of small-diameter holes in production machining, fabrication, and toolroom environments. The Class ZZ tolerance classification is standard for inspection and working gages in light-duty and general-purpose inspection tasks. The set is applicable wherever consistent hole-size verification is required across a range of 0.0197 to 0.0394 inches, including verification of drilled, reamed, or broached bores in metal and similar materials.

Key Features

• 51-piece set covering 0.0197 to 0.0394 inch diameter range
• Class ZZ tolerance classification for general-purpose inspection use
• Double-end design provides two gage members per handle
• Bilateral tolerance of plus or minus 0.002000 inches
• Steel construction for dimensional stability and wear resistance
• Covers metric equivalent range of 0.500 to 1.00 mm

Compatibility

Designed as an OEM-style working gage set for general-purpose hole and bore inspection in toolroom and production quality-control settings where Class ZZ plug gages are specified.

Installation Notes

Plug gages should be handled and stored by trained metrology or toolroom personnel following standard gage-care practices. Clean hole surfaces before gauging to prevent debris from affecting readings or damaging gage surfaces. Do not force gages into holes; apply only light, consistent hand pressure to avoid wear or damage to the gage members. Periodic calibration against a traceable standard is recommended to maintain measurement integrity.