Mitutoyo 177-299 Setting Ring 5 Inch Bore Gage Calibration Standard

The Mitutoyo 177-299 is a precision 5-inch setting ring designed for accurate calibration and zeroing of measuring instruments. This master setting standard provides a reference diameter for quick, reliable setup of bore gages, internal micrometers, and Holtest-style inside measuring tools.

Key Features:

• Precision ground 5.0000 inch reference diameter for accurate instrument calibration
• Hardened and stabilized steel construction for dimensional stability
• Lapped finish provides exceptional surface quality for repeatable measurements
• Compatible with dial bore gages, Holtest internal micrometers, and inside micrometers
• Enables quick zero-setting and accuracy verification of internal measuring instruments

Setting rings are essential metrology standards that allow machinists and quality control professionals to verify the accuracy of their measuring tools before taking critical measurements. The 5-inch size is commonly used for mid-range bore measurements in automotive, aerospace, and general manufacturing applications.