Fastens

Fastens is the third-person singular present tense form of the verb fasten, meaning to attach or secure one object to another or to close an opening. To fasten something is to prevent movement, separation, or exposure by using a method that holds elements together. The action can be temporary or permanent, depending on the tools and materials involved and the required level of security.

Common methods of fastening include mechanical fasteners, such as nails, screws, bolts, rivets, clamps, and welds, as well as non-mechanical methods like adhesives and interlocking features. Clothing and textiles use fasteners such as buttons, zippers, hooks, snaps, laces, and Velcro. Other fastening devices include buckles, clasps, hooks, magnets, and ties. Some fastenings are designed for quick release, while others are intended to endure heavy loads or long-term use.

Fastening devices can be categorized by permanence, load-bearing capacity, and the environment in which they operate. Permanent fasteners provide lasting joins (for example, welds or rivets), while removable fasteners (screws, bolts, clamps, or magnets) allow disassembly. Materials for fasteners include metal, plastic, fabric, and composites, chosen for strength, weight, corrosion resistance, and compatibility with the joined parts.

Applications span construction, furniture, automotive, electronics housings, packaging, and clothing. Proper fastening requires consideration of load, vibration, temperature, chemical exposure, and maintenance. Standards and testing guidelines help ensure performance, safety, and compatibility with other components.