Mitutoyo 177-289 Ring Gage 1.2 Inch Master Calibration Standard

The Mitutoyo 177-289 is a precision ring gage with a 1.2-inch inside diameter, designed as a master calibration standard for setting and verifying internal measuring instruments. This hardened steel gage provides an accurate reference dimension for ensuring measurement accuracy and consistency in quality control operations.

Key Features:

• 1.2-inch (30.48mm) nominal inside diameter
• Hardened and stabilized alloy steel construction for dimensional stability
• Precision lapped and honed bore for exceptional accuracy
• Used for calibrating dial bore gages, Holtest internal micrometers, and inside micrometers
• Master gage quality with tight tolerances
• Knurled outer diameter for secure handling

Ring gages are essential tools in metrology and inspection departments, providing a fixed reference standard to verify the accuracy of adjustable measuring instruments. The Mitutoyo 177-289 enables quick, accurate setup of bore measuring tools, ensuring reliable measurements and reducing inspection errors. Ideal for machine shops, quality labs, and manufacturing facilities requiring precise internal dimension verification.