Mitutoyo 3416A Dial Drop Indicator 1 in 0.001 Grad

Product Description

The MITUTOYO 3416A is a dial drop indicator designed for precision measurement in manufacturing, machining, and inspection applications. It features a 1-inch total measurement range with 0.001-inch graduations and a 0-100 dial reading scale, allowing for accurate surface variation and runout checks. The 3-inch white dial face provides clear readability, and the built-in revolution counter tracks full cycles across the 0.1-inch range per revolution. Accuracy is rated at 0.002 inches per ANSI/AGD standards. The lug back mount and 0.375-inch stem diameter make it compatible with standard indicator holders and magnetic bases used across tool rooms, production floors, and quality labs.

This drop indicator is suited for dimensional inspection work in precision machining, toolroom setups, and quality control environments. It mounts vertically with the contact point moving in a vertical drop motion, making it the preferred style for transfer measurements, bore gauging setups, and surface plate work. The ANSI/AGD Group 3 classification confirms it meets recognized dimensional standards for dial indicators used in industrial and commercial inspection.

Key Features

• 1-inch total measurement range with 0.001-inch dial graduations
• 3-inch white dial face with 0-100 reading scale for easy readability
• Revolution counter tracks full 0.1-inch-per-revolution cycles
• Accuracy of 0.002 inches per ANSI/AGD standards
• Lug back mount with 0.375-inch stem diameter fits standard indicator holders
• Thread size 4-48 and M2.5 x 0.45 for contact point compatibility

Compatibility

Designed as an OEM-style drop indicator compatible with standard AGD Group 3 indicator holders, magnetic base arms, and surface plate fixtures that accept a 0.375-inch stem diameter.

Installation Notes

Drop indicators are typically installed by machinists, quality technicians, and metrologists using standard indicator holders or magnetic base assemblies. Ensure the stem is securely clamped without side-loading the spindle, as this can affect accuracy readings. Zero the dial before taking measurements and verify the contact point thread engagement matches the 4-48 or M2.5 x 0.45 specification. Keep the spindle and stem clean and free of chips or coolant contamination to maintain measurement integrity.