Mitutoyo 1166A Dial Drop Indicator 0.2 in 0.001 in

Product Description

The MITUTOYO 1166A is a plunger-style dial drop indicator designed for precision measurement in machining, inspection, and surface comparison applications. It features a 0.2 inch total measurement range with 0.001 inch graduation and 0.001 inch accuracy, making it suitable for close-tolerance work on the shop floor or in a quality control environment. The 40 mm dial face provides clear readability, and a built-in revolution counter tracks full spindle cycles. A rotating bezel and limit markers allow technicians to set reference positions quickly. Machinists, tool and die makers, and quality inspectors are the primary users of this instrument.

This indicator is used in setups where a standard dial indicator cannot be positioned vertically — the drop-style plunger allows measurement access in restricted or angled orientations. Typical applications include surface plate inspection, fixture setup, runout checks on lathes and mills, and comparator-stand measurements. The ANSI/AGD standard compliance and AGD Group 0 classification confirm it fits standard AGD-compatible indicator holders and magnetic base accessories common in machine shop environments.

Key Features

• 0.2 inch total measurement range with 0.001 inch graduation and 0.001 inch accuracy
• 40 mm dial face with 0-50 dial reading scale for easy reading in both directions
• 1/2 inch range per revolution keeps tracking simple during multi-pass setups
• Built-in revolution counter prevents misreading on multi-turn measurements
• Rotating bezel and limit markers for fast reference-point setting
• Plunger style with No. 4-48 thread size for compatibility with standard AGD accessories
• ANSI/AGD compliant, AGD Group 0 classification

Compatibility

Designed for use with standard AGD-compatible indicator holders, magnetic bases, and comparator stands that accept AGD Group 0 plunger-style dial indicators with a No. 4-48 stem thread.

Installation Notes

A licensed metrologist, machinist, or quality technician typically mounts and calibrates this indicator. Secure the stem in a rigid AGD-compatible holder or magnetic base before taking measurements — any flex in the mounting will reduce accuracy. Avoid side-loading the plunger, as this can introduce error and cause premature wear on the spindle. Handle the instrument carefully; dropping or striking the dial face can affect calibration.