Spi 21-265-4 Flat Needle Contact Point Dial Indicator

Product Description

The SPI 21-265-4 is a flat needle contact point designed for use with dial indicators in precision measurement applications. Machined from black oxide steel, this contact point threads in at a 4-48 thread size and measures 1 inch in contact point length with a measurement tip diameter of 0.06 inches. It conforms to AGD Group 1 industry standards, making it a drop-in fit for a wide range of standard dial indicator bodies. Metrology technicians, machinists, and quality control professionals install this type of contact point when flat-surface probing or fine-point measurement is required.

This contact point is suited for bench inspection, surface plate work, and machine setup tasks where a needle-style tip provides better access to fine features or narrow surfaces. The flat needle profile reduces contact area at the measurement tip, improving accuracy on soft or delicate workpiece surfaces. It is packaged individually and is appropriate for both production floor and toolroom environments where AGD Group 1 dial indicators are in regular use.

Key Features

• Flat needle contact point style for precision probing on fine or narrow surfaces
• Black oxide steel construction for wear resistance and corrosion inhibition
• 4-48 thread size for compatibility with AGD Group 1 dial indicators
• 1 inch contact point length for extended reach in confined measurement locations
• 0.06 inch tip diameter for small-area contact measurement
• Meets AGD Group 1 industry designation standards

Compatibility

Designed for use with AGD Group 1 dial indicators accepting a 4-48 threaded contact point. Refer to your dial indicator manufacturer specifications to confirm thread size and contact point style before installation.

Installation Notes

Contact point replacement is a standard toolroom task performed by machinists or metrology technicians. Ensure the dial indicator spindle is fully retracted and the indicator is removed from any active fixture before swapping contact points. Use the appropriate spanner wrench or contact point tool to thread the 4-48 contact point in by hand and snug gently — do not overtighten, as the fine thread can be damaged. Verify indicator calibration after any contact point change.