What is "lug bolt"

Lug \Lug\ (l[u^]g), n. [Sw. lugg the forelock.]

1. The ear, or its lobe. [Scot. & Prov. Eng.]

2. That which projects like an ear, esp. that by which anything is supported, carried, or grasped, or to which a support is fastened; an ear; as, the lugs of a kettle; the lugs of a founder's flask; the lug (handle) of a jug.

3. (Mach.) A projecting piece to which anything, as a rod, is attached, or against which anything, as a wedge or key, bears, or through which a bolt passes, etc.

4. (Harness) The leather loop or ear by which a shaft is held up.

5. (Zo["o]l.) The lugworm.

6. A man; sometimes implying clumsiness. [slang]

   Lug bolt (Mach.), a bolt terminating in a long, flat extension which takes the place of a head; a strap bolt.

   Lug nut (Mach.), a large nut fitting a heavy bolt; -- used especially of the nuts used to attach wheels to vehicles.

   Lug wrench (Mach.), a wrench used to tighten or loosen lug nuts, usually a steel rod having a hexagonally shaped socket which fits closely over the lug nut; sometimes in the shape of a cross, having several such sockets, one at the end of each arm, to accommodate nuts of different sizes.

n. A bolt pressed into the hub on an axle, with the threaded end out to receive a lug nut.