Starrett 64634 Drop Indicator Contact Point Extension

Product Description

The STARRETT 64634 is a 2-inch drop indicator contact point extension designed for use with AGD dial indicators. Machined from steel and threaded at 4-48, this extension increases the reach of the contact point on a standard dial indicator, allowing measurements in recessed bores, deep grooves, or other locations where the standard contact point cannot reach. It is a direct replacement accessory installed by machinists, tool and die makers, metrology technicians, and precision measurement professionals in production and inspection environments.

This extension is suited for shop floor and inspection room applications where AGD-standard dial indicators are used for surface, bore, or runout measurement. It is particularly useful when access to the measurement surface is restricted by part geometry or fixture depth. The 4-48 threaded connection is the AGD standard interface, making this a practical stock item for any toolroom or quality lab that maintains a set of dial indicator accessories.

Key Features

• 2-inch length extends dial indicator contact point reach for deep or restricted measurement locations
• Steel construction provides durability and dimensional stability in shop environments
• 4-48 thread size matches AGD dial indicator contact point styli standards
• Lightweight at 0.5 pounds, adding minimal mass to the indicator spindle
• Single-piece replacement accessory, sold individually

Compatibility

Designed for use with AGD dial indicators that accept 4-48 threaded contact point accessories.

Installation Notes

Installation requires no special tools beyond finger-tightening the 4-48 threaded extension onto the dial indicator spindle contact point stem. Ensure the indicator is removed from its holder or stand before changing contact point accessories to avoid accidental movement or indicator damage. Do not overtighten the threaded connection, as the fine 4-48 thread can be damaged by excessive torque. Verify that the extended contact point length does not exceed the usable travel range of the indicator spindle before taking measurements.