Starrett 64635 Drop Indicator Contact Point Extension

Product Description

The STARRETT 64635 is a 3-inch drop indicator contact point extension designed to increase the reach of standard drop indicator contact points. Machined from steel and threaded at 4-48, this extension mounts directly to compatible indicator contact points to extend measurement depth in confined or hard-to-access locations. It is a replacement accessory used by machinists, metrology technicians, and quality control personnel working with dial drop indicators in industrial and shop environments. The 4-48 thread is the standard thread form for indicator contact point accessories.

This extension is used in applications where a standard contact point cannot reach the measurement surface due to depth, bore geometry, or fixture clearance constraints. It fits into typical indicator and gage setups on surface plates, machine tools, fixtures, and inspection stations. The part ships individually and is sold as a single unit replacement component for worn or lost extensions on existing drop indicator assemblies.

Key Features

• 3-inch extension length increases contact point reach for deep or obstructed measurement surfaces
• Steel construction provides durability and dimensional stability under repeated use
• 4-48 threaded connection matches the standard thread form for drop indicator contact point accessories
• Sold as a single unit for direct replacement without purchasing a full contact point kit
• Compact and lightweight at 1 pound, suitable for bench and portable indicator setups

Compatibility

Designed as an OEM-style replacement extension for drop indicators that accept standard 4-48 threaded contact point accessories.

Installation Notes

Installation is performed by machinists or metrology technicians familiar with indicator and gage accessories. Thread the extension onto the contact point stem by hand and snug lightly — do not overtighten, as the 4-48 thread form on small-diameter steel components can be damaged by excessive torque. Verify indicator zero and repeatability after installing any contact point extension, as added length can affect stylus alignment and measurement accuracy.