Retaining Ring, M30 External

Exactly the right fit for the gap between the spindle gear and oil seal on my SC4 bench lathe. The M30 external ring seated firmly and held the assembly in place without any play.

Took a few tries to seat it between the gear and oil seal, but once it clicked in, the spindle turns smooth with zero wobble. Exactly the M30 size I needed for the SC4 lathe, and it held up fine during a full hour of threading.

This ring fit precisely over the spindle shoulder on my SC4 lathe, seating the 32-tooth gear snugly against the oil seal. Installed without any filing or forcing—just a clean slip-on with snap-ring pliers. A small but crucial part that saved me from a whole new spindle assembly.