Mitutoyo 2977AB Dial Drop Indicator 0.0005-0.04 in

Product Description

The MITUTOYO 2977AB is a dial drop indicator designed for precise dimensional measurement in machining, metrology, and quality control applications. It delivers a measurement range of 0.0005 to 0.04 inches with a dial graduation of 0.0005 inches, making it well suited for detecting small surface variations or part deviations. The 20-0-20 dial reading allows bidirectional measurement from a zero reference point. With an accuracy of 0.0005 inches and a range per revolution of 0.055 inches, this indicator provides reliable, repeatable readings in production and inspection environments. A flat back and 3/8-inch stem diameter are standard features for fixture mounting.

This indicator is used in machine shops, tool rooms, and inspection departments where tight-tolerance verification is required. It fits standard indicator holders, magnetic bases, and surface plate setups. The 20-0-20 dial format is common in applications where the technician zeros to a reference and checks deviation in either direction, such as runout checks, flatness verification, and setup alignment on mills or lathes. It is appropriate for both production floor use and bench inspection work.

Key Features

• Measurement range of 0.0005 to 0.04 inches for fine-tolerance inspection
• 0.0005-inch dial graduation for high-resolution readings
• 20-0-20 dial reading enables bidirectional deviation measurement from zero
• 0.055 inches per revolution for smooth, controlled spindle travel
• Flat back design for secure, stable fixture mounting
• 3/8-inch stem diameter fits standard indicator holders and magnetic bases
• White dial face for clear graduation visibility

Compatibility

Designed as an OEM-style replacement or direct-use dial drop indicator compatible with standard 3/8-inch stem indicator holders, magnetic bases, and surface plate fixtures used in machine shop and metrology applications.

Installation Notes

Installation is performed by machinists, tool and die makers, or quality control technicians. Mount the indicator by inserting the 3/8-inch stem into a compatible holder and tighten the clamp snugly without overtightening, which can distort the stem and affect accuracy. Zero the dial at a known reference surface before taking measurements. Avoid lateral loading on the spindle, as this can introduce measurement error and cause premature wear.