Spi 21-263-9 Flat Needle Contact Point Dial Indicator

Product Description

The SPI 21-263-9 is a flat needle contact point designed for use with dial indicators in precision measurement applications. It threads into standard AGD Group 1 dial indicator spindles using a 4-48 thread and features a measurement tip diameter of 0.031 inches and a contact point length of 1 inch. Constructed from black oxide steel, this contact point provides durability and corrosion resistance in workshop and inspection environments. It is installed by metrology technicians and machine shop personnel performing dimensional inspection, gauging, and surface runout checks.

This contact point is suited for applications requiring a fine needle-style tip where a standard ball contact would not make accurate contact with the feature being measured. Typical uses include measuring into narrow grooves, slots, and recessed features on machined parts. The flat needle profile allows consistent contact on flat or planar surfaces where a spherical tip would rock or give inconsistent readings. It is compatible with AGD Group 1 dial indicators accepting a 4-48 threaded contact point.

Key Features

• Flat needle tip profile for accurate contact on flat and recessed surfaces
• 4-48 thread fits AGD Group 1 dial indicator spindles
• Black oxide steel construction for corrosion resistance and durability
• 0.031 inch tip diameter suits narrow grooves and fine-feature inspection
• 1 inch contact point length provides reach for recessed measurement locations

Compatibility

Designed as a replacement or accessory contact point for AGD Group 1 dial indicators accepting a 4-48 threaded contact point.

Installation Notes

Contact points are installed and removed by hand or with the appropriate spanner wrench — avoid over-tightening to prevent spindle thread damage. Ensure the dial indicator spindle is fully retracted and the indicator is removed from any active measurement setup before swapping contact points. Verify thread engagement is complete and the contact point seats flush against the spindle face before use. Inspect the tip for burrs or damage before taking measurements, as tip condition directly affects reading accuracy.