Mitutoyo 1921AB-10 Dial Drop Indicator 0.1 in Range

Product Description

The MITUTOYO 1921AB-10 is a plunger-style dial drop indicator designed for precision dimensional measurement in machine shop, inspection, and fabrication environments. It covers a measurement range of 0 to 0.1 inches with a dial graduation of 0.001 inches and an accuracy of plus or minus 0.001 inches. The 0-20-0 balanced dial reading allows quick detection of both positive and negative deviation from a set reference point. Travel per revolution is 0.04 inches. The jeweled bearing movement supports consistent, repeatable readings across extended use. Machinists, toolmakers, quality technicians, and precision tradespeople use this indicator for runout checks, surface comparisons, and setup verification on mills, lathes, and surface plates.

This indicator is suited for bench inspection, fixture setup, and machine tool alignment in both production and job-shop settings. The flat back and clamp-on base mount type allow straightforward mounting to magnetic bases, indicator holders, and articulating arms common in inspection and machining workflows. The low measuring force of 0.3 to 1.8 N makes it appropriate for use on delicate or finished surfaces where minimizing contact pressure is important.

Key Features

• Measurement range: 0 to 0.1 inches with 0.001 inches graduation
• Balanced 0-20-0 dial reading for positive and negative deviation checks
• Jeweled bearing movement for smooth, repeatable operation
• Low contact force: 0.3 to 1.8 N to protect finished surfaces
• Flat back with clamp-on base mount for versatile fixture compatibility
• Travel of 0.04 inches per spindle revolution

Compatibility

Designed as an OEM-style plunger dial indicator for use with standard clamp-on magnetic bases and indicator holders accepting a flat-back indicator body.

Installation Notes

Installation is performed by machinists, toolmakers, and quality technicians. Mount the indicator to a rigid magnetic base or holder using the clamp-on attachment point, ensuring the spindle axis is perpendicular to the surface being measured to avoid cosine error. Zero the dial at the reference surface before taking comparative readings. Do not force the spindle beyond its rated travel range, as overtravel can damage the jeweled bearing movement.