Key Features

• 18–50 mm / .7"–1.96" range
• Self-centering design
• 115 mm measuring depth
• 2 µm error limit
• 0.5 µm repeatability
• Low-expansion Invar construction
• Modular measuring system
• Premium German precision-inspection solution

Overview

The Mahr Marameter 844 N is a higher-end self-centering bore-gaging system for demanding precision inspection, positioned above conventional shop-floor dial bore gages.

Thermal Stability

Its construction uses Invar steel, selected for extremely low thermal expansion, which helps minimize measurement error caused by operator body heat and changes in ambient temperature. On a gage specified to a 2 µm error limit, thermal drift is a first-order concern rather than a footnote.

Measurement and Operation

With a specified error limit of 2 µm and repeatability of 0.5 µm across an 18–50 mm range and 115 mm measuring depth, the 844 N suits inspection tasks where a .0005" shop gage cannot resolve the tolerance. The modular measuring system allows the platform to be configured for specific applications.

Applications

Precision inspection and calibration environments — aerospace, medical, bearing and advanced manufacturing work where bore tolerances are held in microns.