Mitutoyo 101189 Drop Indicator Flat Contact Point 3/8in

Product Description

The MITUTOYO 101189 is a flat contact point designed for drop indicators used in precision measurement applications. Machined from solid carbide, it offers the wear resistance required for repeated contact cycles in shop-floor and inspection environments. The contact point measures 3/8 inches in diameter and 3/8 inches in length, threading onto the indicator spindle via a 4-48 thread. Licensed metrology technicians, machinists, and quality control inspectors install and swap contact points as part of routine indicator maintenance and application-specific setup.

This contact point is suited for use with AGD Group 1, 2, 3, and 4 dial indicators where a flat contact geometry is required. Flat contact points are commonly selected when measuring flat surfaces, shoulders, or workpiece faces where a ball-style point could introduce rounding error. The solid carbide construction makes it appropriate for high-cycle production inspection as well as toolroom and quality lab settings.

Key Features

• Flat contact point style for accurate measurement on flat workpiece surfaces
• Solid carbide construction for extended wear life in high-cycle use
• 3/8 inches diameter contact face
• 3/8 inches contact point length
• 4-48 thread for standard AGD indicator spindle compatibility
• Compatible with AGD Group 1, 2, 3, and 4 dial indicators

Compatibility

Designed for use with AGD Group 1, 2, 3, and 4 dial indicators equipped with a 4-48 threaded spindle.

Installation Notes

Contact point replacement is performed by metrology technicians or machinists. Before removing or installing a contact point, ensure the indicator is unmounted from any fixture or surface plate stand to prevent accidental damage to the spindle. Thread the contact point onto the 4-48 spindle by hand until snug, then use the appropriate spanner or contact point wrench to secure it without overtightening, as excessive force can damage the spindle threads. Verify indicator zeroing and calibration after any contact point change.