Yep, that's what it means. A "2-56" pushrod is actually a pushrod with ends threaded with 2-56 rods. The actual rod may actually be a different diameter (in fact, the "standard" Dubro 2-56 rods are slightly smaller than "2" in diameter. You can't thread them with a thread cutting die). The funny part is when you have a "2-56" rod and use Z-bends or other non-threaded connectors on each end. So you're seeing a bit of shorthand by referring to the entire pushrod as "2-56" or "4-40", but we all know what we mean, it's a good way to tell how thick the wire end of the pushrod is. (oh, btw, watch out for some ARFs made overseas. They often come with 2mm rods instead of 2-56. Close, but not compatible)