Starrett 70791 Drop Indicator Contact Point 4-48 Thread

Product Description

The STARRETT 70791 is a drop indicator contact point designed for use with AGD dial indicators in precision measurement applications. Machined from steel, this contact point features a 4-48 thread for secure attachment to compatible indicator spindles. It measures 9.53 mm (3/8 inch) in contact point length with a 5.16 mm tip diameter and an overall length of 6.30 mm (1/4 inch). Metrology technicians, tool-and-die machinists, and quality control inspectors install these points when setting up or replacing worn contact tips on dial indicator assemblies.

This contact point is suited for shop-floor and laboratory measurement setups where AGD-standard dial indicators are used for surface runout checks, bore gauging, part alignment, and fixture verification. The 4-48 thread is the standard AGD contact point thread, making this a direct-fit replacement in applications requiring a standard-diameter ball or flat-style tip. It is appropriate for both production environments and bench inspection work.

Key Features

• Steel construction for durability in repeated-contact measurement tasks
• 4-48 thread size matches AGD dial indicator spindle standard
• Contact point length of 9.53 mm (3/8 inch) for standard reach applications
• 5.16 mm tip diameter provides a consistent contact surface
• Overall length of 6.30 mm (1/4 inch) keeps the indicator profile compact

Compatibility

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

Installation Notes

Contact point replacement is performed by metrology technicians or machinists using a small wrench or contact point tool. Before replacing, remove the indicator from the fixture and verify the spindle threads are clean and undamaged. Thread the contact point in by hand until snug, then tighten gently to avoid stripping the fine 4-48 threads. Do not use power tools or excessive force during installation.