Starrett 70827 Drop Indicator Radius Contact Point

Product Description

The STARRETT 70827 is a radius-style contact point designed for drop indicators and AGD dial indicators. Machined from solid carbide, this contact point threads into standard 4-48 indicator stems and delivers reliable, repeatable surface contact during precision measurement work. The tip geometry is radiused to reduce measurement error on curved or irregular workpiece surfaces. Overall length is 1.5 inches (38.1 mm) with a tip diameter of 0.203 inches (5.16 mm). Metrology technicians, machinists, and quality control inspectors rely on replacement contact points like this to maintain calibration integrity and extend the service life of their indicators without replacing the entire gauge body.

This contact point is suited for precision measurement applications in machine shops, tool rooms, and quality inspection environments. It fits drop-style indicators used for surface measurement, runout checks, and part inspection on mills, lathes, surface plates, and CMM setups. The 4-48 thread is the standard thread specification for AGD-pattern dial indicator contact points, making this a common replacement item in metrology-intensive settings.

Key Features

• Solid carbide construction for extended wear resistance on hardened workpiece surfaces
• Radius contact point style reduces localized contact error on curved surfaces
• 4-48 thread fits standard AGD dial indicator stems
• Overall length of 1.5 inches (38.1 mm) provides standard reach for most drop indicator bodies
• Tip diameter of 0.203 inches (5.16 mm) suitable for general surface gauging applications

Compatibility

Designed for use with STARRETT 650 and 651 Back Plunger Dial Indicators and AGD Dial Indicators with 4-48 threaded contact point stems.

Installation Notes

Installation is performed by metrology technicians or machinists. Remove the existing contact point by unscrewing it from the indicator stem before threading in the replacement. Use a contact point wrench or smooth-jaw pliers with care to avoid damaging the carbide tip or the indicator body. Verify indicator zero and calibration after any contact point change to ensure measurement accuracy is maintained.