Mitutoyo 101388 Drop Indicator Shell Contact Point

Product Description

The MITUTOYO 101388 is a shell-style contact point designed for drop indicators and dial gages used in precision dimensional measurement. Machined from solid carbide, this contact point threads into the indicator spindle via an M2.5 x 0.45 thread, providing a stable, wear-resistant contact surface. The tip measures 5 mm in diameter and extends 25 mm in contact point length, offering consistent probe geometry for surface, bore, and feature inspection work. Metrology technicians and machine shop personnel install this part as a direct replacement or upgrade contact point on AGD-style drop indicators.

This contact point is suited for use in quality control, production inspection, and toolroom measurement environments. It is compatible with AGD Group 1, 2, 3, and 4 drop indicators where an M2.5 x 0.45 threaded contact point is required. The shell contact point style provides clearance and support around the probe tip, making it appropriate for applications where the indicator must be positioned against flat surfaces, machined features, or fixtures. It is commonly found in horizontal and vertical setups on surface plates, V-blocks, and inspection fixtures.

Key Features

• Solid carbide construction for extended wear life in repetitive gauging applications
• M2.5 x 0.45 thread for direct installation into compatible drop indicator spindles
• 5 mm diameter tip provides a defined, repeatable contact surface
• 25 mm contact point length suits standard indicator reach requirements
• Shell contact point style compatible with AGD Group 1, 2, 3, and 4 indicators
• Diameter of measurement: 0.1969 inch (5 mm)

Compatibility

Designed for use with AGD Group 1, 2, 3, and 4 drop indicators requiring an M2.5 x 0.45 threaded contact point. Dial gages are suitable for mounting with this contact point style.

Installation Notes

Installation is performed by metrology or machine shop personnel using standard hand tools. Before replacing the contact point, remove the indicator from any active measurement setup and ensure the spindle is fully retracted to relieve spring tension. Thread the contact point in by hand first, then snug with an appropriate wrench to avoid cross-threading or over-torquing the M2.5 spindle thread. Inspect the mating thread on the indicator spindle for wear or contamination before installation.