Starrett 64632 Drop Indicator Contact Point Extension

Product Description

The STARRETT 64632 is a contact point extension designed for drop-style dial indicators. It threads directly onto the indicator spindle using a 4-48 thread and extends the reach of the contact point by 0.5 inches. Constructed from steel, it provides the rigidity and durability required for repeatable measurement in shop or field use. This type of extension is a standard accessory for AGD dial indicators and is used when the base contact point cannot reach the measurement surface directly. Licensed metrology technicians, machinists, and quality control inspectors install and swap these extensions as part of routine indicator setups.

This extension is suited for use in manufacturing, machine shop, and inspection environments where AGD-style dial indicators are employed. Typical applications include checking runout, surface variation, and part geometry on lathes, milling machines, surface plates, and inspection fixtures. The 4-48 thread is the AGD standard for contact points and extensions, making this a commonly stocked replacement and supplemental accessory for indicator kits.

Key Features

• Steel construction for rigidity and long service life
• 4-48 thread matches AGD dial indicator contact point standard
• 0.5 inch extension length increases contact point reach
• Drop indicator style for use in vertical spindle applications
• Single-piece replacement accessory, sold individually

Compatibility

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

Installation Notes

Thread the extension onto the indicator spindle by hand, taking care not to cross-thread the 4-48 connection. Use a proper contact point wrench if needed to snug the extension without over-torquing the threaded joint. Remove the indicator from its holder before swapping contact point extensions to avoid stressing the spindle. Verify indicator calibration and zero after any contact point change.