SPI Edge Finder, Mechanical, 0.5" Head Diameter, 1/2" Shank Diameter, 0.0002" Accuracy,

The SPI Mechanical Edge Finder is a dedicated machining accessory designed to locate workpiece edges quickly on manual or CNC machinery. It provides an essential baseline for machinists setting up parts on milling machines and lathes, ensuring metalworking projects start from an exact reference point.

Featuring a 0.5-inch head diameter and a 1/2-inch shank, this tool mounts directly into standard machine tool holders. Its cylindrical contact design provides consistent edge detection across various workpiece surfaces and materials, while the 0.0002-inch accuracy rating allows for dependable, tight-tolerance work in machine shop environments.

Because this is a purely mechanical edge finder, it relies on manual visual observation to detect the offset point during spindle rotation. Additionally, the tool requires a 1/2-inch holding capacity, meaning smaller chucks or collets will need adapters, and the product listing does not state whether a protective storage case is included.

Verdict: Machinists looking for a dependable, highly accurate locating tool will find this unit well suited for daily shop tasks. It is an ideal pick for anyone operating milling machines or lathes equipped with 1/2-inch tool holders.

• Brand: SPI (MSC Industrial)
• Type: Mechanical edge finder
• Head Diameter: 0.5 inches
• Shank Diameter: 1/2 inch
• Accuracy: 0.0002 inches
• Contact Design: Cylindrical
• Compatible Machinery: Milling machines and lathes

A great fit if you:

• Need precise 0.0002-inch edge location for milling or turning operations
• Use machinery equipped with standard 1/2-inch tool holders
• Work with various workpiece materials and need consistent cylindrical contact

Consider something else if you:

• Require an electronic or audible edge detection system
• Only have tool holders or collets smaller than 1/2 inch

What is the accuracy of this edge finder?
It features an accuracy rating of 0.0002 inches for precise machining and metalworking measurements.

What size tool holder is required?
The tool has a 1/2-inch shank diameter, allowing it to fit standard 1/2-inch machine tool holders.

What machines can this edge finder be used with?
It is designed for locating workpiece edges on both milling machines and lathes.