Abstract: A stock stop assembly for a multiple spindle lathe is disclosed. A bracket secured to the lathe has a non-threaded aperture formed therethrough. A stock stop includes a head portion having an abutment surface and a threaded shank portion disposed within the bracket aperture. The shank portion can have a flat surface formed thereon. A split locking collar is threaded onto the shank portion. When the shank portion is inserted within the bracket aperture, the locking collar engages the bracket to determine the relative position of the abutment surface. A bore is formed through the adjacent split ends of the lock nut, and a threaded fastener is disposed within the bore. The threaded fastener is tightened to compress the locking collar about the shank portion to secure the locking collar in position. A threaded transverse aperture is also formed in the bracket. A threaded fastener is threaded into the transverse aperture.