Mahr 44 AS Self-Centering Inside Micrometer Set

Reading a true bore diameter by hand means a micrometer that centers itself on three points, not two. The Mahr 44 AS does that mechanically — a self-centering 3-point inside micrometer supplied as a set with the heads and setting rings to cover its range, graduated to 0.001 mm.

A Mahr 44 AS self-centering inside micrometer set

Key features & specifications

• Mechanical 3-point self-centering inside micrometer, supplied as a set
• Set ranges: 6–12, 12–20, 20–50 and 50–100 mm (sets cover 6–100 mm)
• Graduation: 0.001 mm (6–20 mm) / 0.005 mm (20–100 mm)
• Error limit: 4–5 µm; conforms to DIN 863-4
• Each set includes multiple micrometer heads and matching setting rings
• Self-centering three-point contact for true bore diameter
• Supplied in a case
• Mahr article no. 4190350