Key, 3x10 mm

Finally found the correct size for my mini lathe's gear train — these 3x10 mm keys fit perfectly and are precision-ground enough that I didn't need to file anything. The machined finish is clean and square, exactly what you need for a tight keyway fit.

Took me a while to find a 3x10 mm key that actually fits these bench-top machines, and this one seats perfectly in the slot with no slop. Good enough that I bought a spare to keep in the drawer.

Finally, a replacement that matches the original Sieg keyway exactly — the 3x10mm dimensions were spot-on for my mini lathe. Slid right in with no filing needed.