What is the term used for a fastener that has threads at both ends?

The term for a fastener that has threads at both ends is a stud. Studs are specifically designed to provide a way to join two components together by having threads on both ends, allowing for a secure attachment to other materials or fasteners. This dual-thread design enables studs to be used in various applications, such as in creating bolted connections or for anchoring components in construction and manufacturing.

In contrast, bolts typically have a head and are only threaded along their shaft, requiring a nut for fastening. Nails are smooth fasteners used primarily for wood construction and do not have threads that engage external materials in the same way. Anchors are designed to secure objects in materials like concrete or masonry but do not possess threads on both ends, focusing instead on creating stability through expansion or other mechanisms. The distinct threading on both ends is what makes studs particularly useful for specific fastening applications.