Mitutoyo 101121 Needle Contact Point M2.5x0.45 Agd Dial Indicator

Product Description

The MITUTOYO 101121 is a steel needle contact point designed for use with dial indicators and drop indicators. It threads in via an M2.5x0.45 threaded shank and features a 5 mm diameter base with a 15 mm contact point length. The needle tip geometry concentrates measurement at a precise, repeatable location, making it the correct choice when measuring into grooves, small bores, or recessed features where a standard ball contact point cannot seat properly. Machinists, quality technicians, and metrology professionals install this contact point when setting up comparator stands or surface plate inspection routines.

This contact point is designed for mounting on AGD Group 1, 2, 3, and 4 dial gages. It suits general-purpose dimensional inspection in manufacturing, toolroom, and quality control environments. The M2.5x0.45 thread is the AGD standard for contact point attachment, allowing direct substitution on most dial indicators that accept this thread form. It is suited for both bench-mounted and hand-held indicator setups where a needle profile is required for part geometry access.

Key Features

• Needle-style contact point provides precise tip engagement in grooves, slots, and recessed surfaces
• Steel construction offers durability under repeated contact cycling
• M2.5x0.45 threaded shank matches AGD standard contact point thread
• 15 mm contact point length allows reach into confined measurement locations
• 5 mm base diameter maintains stability at the indicator spindle interface
• Compatible with AGD Group 1, 2, 3, and 4 dial indicators

Compatibility

Designed for use with AGD Group 1, 2, 3, and 4 dial gages that accept the M2.5x0.45 contact point thread standard.

Installation Notes

Contact point replacement is typically performed by a machinist or metrology technician using a contact point wrench or flat-blade tool — do not overtighten, as the M2.5x0.45 thread is fine-pitch and can be damaged by excessive torque. Remove the indicator from any active clamping fixture before changing contact points. Verify the replacement point is fully threaded and seated before returning the indicator to service. Inspect the spindle thread for damage or debris prior to installation.