The smallest lathe chuck is the?

• A. Three-jaw chuck
• B. Jacobs chuck
• C. Collet
• D. Expanded chuck

Answer: (C)

The concept here is how different lathe chucks grip the workpiece and how their sizes vary. A collet is the smallest style because it’s a slim sleeve that clamps tightly around a specific diameter. It comes in many very small sizes and provides a tight, highly concentric grip with a minimal outer envelope, which keeps the overall setup compact.

Three-jaw chucks, by contrast, use three moving jaws to center a range of diameters, but their jaws and jaws’ travel add bulk and reduce precision compared to a collet. Jacobs chucks are drill-type chucks often used on drill presses and sometimes on lathes for small parts; they’re generally larger and not optimized for the smallest work. Expanded chucks grip irregular shapes by expanding to hold the work, which also requires a larger body. So the smallest lathe chuck is the collet.