What is another word for carriage bolt?
Pronunciation: [kˈaɹɪd͡ʒ bˈə͡ʊlt] (IPA) 
Carriage bolt is a fastener used to join two pieces of wood or metal together. Its distinctive feature is a smooth, dome-shaped head with a square shoulder beneath that keeps the bolt from turning once it is screwed into place. Synonyms for carriage bolt include coach bolt, plow bolt, round head bolt, and mushroom head bolt. Coach bolt is often used interchangeably with carriage bolt but tends to be longer and have a more tapered square shoulder. Plow bolt has a flat, countersunk head and is often used in heavy-duty applications. Round head bolt has a rounded head with a flat top and is commonly used in furniture assembly. Mushroom head bolt has a wide, flat head that resembles a mushroom cap and is used in more decorative applications.
