Mitutoyo 21EZA105 Drop Indicator Lifting Knob

Product Description

The MITUTOYO 21EZA105 is a replacement lifting knob designed for use with IDN series drop indicators. The lifting knob allows the technician to manually retract the indicator spindle, protecting the contact point and gauge mechanism during part loading and repositioning. This small but critical accessory maintains smooth indicator operation in inspection and quality control setups. It threads directly onto the indicator body using an M2.5x0.45 thread. Metrology technicians, machinists, and quality control professionals working in toolrooms, production floors, and calibration labs will use this part to restore or replace a worn or damaged original knob.

This lifting knob is suited for precision measurement environments where IDN drop indicators are in regular use. Typical applications include surface plate inspection, fixture gauging, and CMM-adjacent manual measurement setups. Because IDN indicators are commonly found in both light production and dedicated metrology environments, having a replacement lifting knob on hand minimizes downtime when the original component wears or is lost during maintenance.

Key Features

• Direct OEM-style replacement for the lifting knob on IDN series drop indicators
• M2.5x0.45 thread for precise fit on compatible indicator bodies
• Enables manual spindle retraction to protect contact point during workpiece loading
• Lightweight component at 0.02 pounds, minimal effect on indicator balance
• Sold individually — single-unit packaging with no minimum order beyond one unit

Compatibility

Designed for use with MITUTOYO IDN series drop indicators as stated by the manufacturer. No additional compatible model numbers were specified in the product data.

Installation Notes

Installation is performed by the technician servicing or maintaining the drop indicator. Before replacing the lifting knob, remove the indicator from any active fixture or holding arm to avoid accidental spindle contact or gauge damage. Thread the knob onto the M2.5x0.45 spindle boss by hand, taking care not to cross-thread the fine metric threads. No special tools are required, but confirm the knob seats flush and rotates freely before returning the indicator to service.