A fastener is a device that attaches one thing to another or holds something in place, whether it's the fastener that secures a baby in her car seat or the fasteners you use to snap your jacket shut.

If you go into a hardware store to buy fasteners, you'll come out with some kind of hardware you can use to fasten things together. Screws, bolts, and nails are all fasteners. Unlike welding and soldering, they're a non-permanent way to connect things. If you do a lot of sewing, you also use a variety of fasteners, from snaps and buttons to Velcro and hooks. A fastener makes things fast, or secure.

Definitions of fastener
  1. noun
    restraint that attaches to something or holds something in place
    synonyms: fastening, fixing, holdfast
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    a strap around the belly of a draft animal holding the shafts of a wagon
    fastener that fastens together two ends of a belt or strap; often has loose prong
    a round fastener sewn to shirts and coats etc to fit through buttonholes
    carabiner, karabiner, snap ring
    an oblong metal ring with a spring clip; used in mountaineering to attach a rope to a piton or to connect two ropes
    a fastener that fastens or locks a door or window
    a fastener (as a buckle or hook) that is used to hold two things together
    a fastener (usually with two projecting horns) around which a rope can be secured
    the flattened part of a nail or bolt or rivet
    any of various small fasteners used to hold loose articles together
    clothes peg, clothes pin, clothespin
    wood or plastic fastener; for holding clothes on a clothesline
    corrugated fastener, wiggle nail
    a small strip of corrugated steel with sharp points on one side; hammered across wood joints in rough carpentry
    cottar, cotter
    fastener consisting of a wedge or pin inserted through a slot to hold two other pieces together
    cringle, eyelet, grommet, grummet, loop
    fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines
    dowel, dowel pin, joggle
    a fastener that is inserted into holes in two adjacent pieces and holds them together
    fillet, stopping
    fastener consisting of a narrow strip of welded metal used to join steel members
    hook and eye
    a kind of fastener used on clothing
    any of various fastenings formed by looping and tying a rope (or cord) upon itself or to another rope or to another object
    rope that is used for fastening something to something else
    link, linkup, tie, tie-in
    a fastener that serves to join or connect
    a fastener fitted to a door or drawer to keep it firmly closed
    a fastener that locks or closes
    a thin pointed piece of metal that is hammered into materials as a fastener
    nut and bolt
    a fastener made by screwing a nut onto a threaded bolt
    paper fastener
    a fastener for holding a sheet of paper in place
    a small slender (often pointed) piece of wood or metal used to support or fasten or attach things
    a fastener with a tapered threaded shank and a slotted head
    fastener that provides a tight and perfect closure
    seal, sealing wax
    fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters
    slide fastener, zip, zip fastener, zipper
    a fastener for locking together two toothed edges by means of a sliding tab
    press stud, snap, snap fastener
    a fastener used on clothing; fastens with a snapping sound
    a fastener consisting of a peg or pin or crosspiece that is inserted into an eye at the end of a rope or a chain or a cable in order to fasten it to something (as another rope or chain or cable)
    toggle bolt
    a fastener consisting of a threaded bolt and a hinged spring-loaded toggle; used to fasten objects to hollow walls
    Allen screw
    a screw with a hexagonal hole in the head
    barrel knot, blood knot
    a knot used for tying fishing leaders together; the ends of the two leaders are wrapped around each other two or three times
    a small clip or pin for holding hair in place
    belt buckle
    the buckle used to fasten a belt
    bicycle clip, trouser clip
    a clip worn around a cyclist's ankles that keeps trousers from becoming caught in the bicycle chain
    bitt pin
    a pin through the bitthead to keep the mooring lines from slipping off
    a screw that screws into a nut to form a fastener
    bow, bowknot
    a knot with two loops and loose ends; used to tie shoelaces
    a small nail
    break seal
    a seal that must be broken when first used and cannot easily be resealed
    bridge, nosepiece
    the link between two lenses; rests on the nose
    alligator clip, bulldog clip
    a clip with a spring that closes the metal jaws
    cap screw
    a threaded screw for machine parts; screws into a tapped hole
    carrick bend
    a knot used to connect the ends of two large ropes or hawsers
    clout, clout nail
    a short nail with a flat head; used to attach sheet metal to wood
    clove hitch
    a knot used to fasten a line temporarily to a post or spar
    coat button
    a button on a coat
    combination lock
    lock that can be opened only by turning dials in a special sequence
    cotter pin
    a cotter consisting of a split pin that is secured (after passing through a hole) by splitting the ends apart
    cylinder lock
    a lock in which a cylinder rotates to move a bolt; tumblers are pins; inserting the key lifts and aligns the pins to free the cylinder to rotate
    a lock on an exterior door
    a nail with a large head; formerly used to decorate doors
    eightpenny nail
    a nail 2.5 inches long
    figure eight, figure of eight
    a knot having the shape of the numeral 8; tied in a rope that has been passed through a hole or pulley and that prevents the rope from coming loose
    fisherman's bend
    a knot for tying a line to a spar or ring
    fisherman's knot, true lover's knot, truelove knot
    a knot for tying the ends of two lines together
    fourpenny nail
    a nail 1.5 inches long
    seal consisting of a ring for packing pistons or sealing a pipe joint
    Gordian knot
    an intricate knot tied by Gordius, the king of Phrygia, and cut by the sword of Alexander the Great after he heard that whoever undid it would become ruler of Asia
    a double pronged pin used to hold women's hair in place
    hair slide
    a decorative hinged clip that girls and women put in their hair to hold it in place
    half hitch
    a knot used to fasten a rope temporarily to an object; usually tied double
    a fastener for a door or lid; a hinged metal plate is fitted over a staple and is locked with a pin or padlock
    a long sturdy pin used by women to secure a hat to their hair
    hawser bend
    a knot uniting the ends of two lines
    a knot that can be undone by pulling against the strain that holds it; a temporary knot
    a short nail with a thick head; used to protect the soles of boots
    hood latch
    a catch that holds the hood of a car shut
    a catch for locking a door
    catch for fastening a door or gate; a bar that can be lowered or slid into a groove
    door latch, latch
    spring-loaded doorlock that can only be opened from the outside with a key
    lever lock
    a lock whose tumblers are levers that must be raised to a given position so that the bolt can move
    linchpin, lynchpin
    pin inserted through an axletree to hold a wheel on
    loop knot
    any of various knots used to make a fixed loop in a rope
    love knot, lover's knot, lovers' knot, true lover's knot, true lovers' knot
    a stylized or decorative knot used as an emblem of love
    machine screw
    a screw used either with a nut or with a tapped hole; slotted head can be driven by a screwdriver
    metal screw
    screw made of metal
    overhand knot
    a simple small knot (often used as part of other knots)
    a detachable lock; has a hinged shackle that can be passed through the staple of a hasp or the links in a chain and then snapped shut
    gem clip, paper clip, paperclip
    a wire or plastic clip for holding sheets of paper together
    nog, peg
    a wooden pin pushed or driven into a surface
    Phillips screw
    a screw with a special head having crossed slots
    piston ring
    seal consisting of a split metal ring that seals the gap between a piston and the cylinder wall
    prolonge knot, sailor's breastplate
    a knot in the rope used to drag a gun carriage
    heavy pin having a head at one end and the other end being hammered flat after being passed through holes in the pieces that are fastened together
    safety pin
    a pin in the form of a clasp; has a guard so the point of the pin will not stick the user
    sash fastener, sash lock, window lock
    a lock attached to the sashes of a double hung window that can fix both in the shut position
    a screw (often without a head) that fits into the boss or hub of a wheel or cam etc. and prevents motion of the part relative to the shaft on which it is mounted
    a screw that is used to adjust the tension on a spring
    a knot for shortening a line
    shirt button
    a button on a shirt
    sixpenny nail
    a nail 2 inches long
    a long pin for holding meat in position while it is being roasted
    a knot at the end of a cord or rope that can slip along the cord or rope around which it is made
    a large stout nail
    square knot
    a double knot made of two half hitches and used to join the ends of two cords
    paper fastener consisting of a short length of U-shaped wire that can fasten papers together
    a short U-shaped wire nail for securing cables
    stopper knot
    a knot that prevents a rope from passing through a hole
    straight pin
    pin consisting of a short straight stiff piece of wire with a pointed end; used to fasten pieces of cloth or paper together
    stub nail
    a short thick nail
    surgeon's knot
    any of several knots used in tying stitches or ligatures
    a short nail with a sharp point and a large head
    tenpenny nail
    a nail 3 inches long
    screw designed to be turned with the thumb and fingers
    drawing pin, pushpin, thumbtack
    a tack for attaching papers to a bulletin board or drawing board
    Turk's head
    an ornamental knot that resembles a small turban
    seal consisting of a flat disk placed to prevent leakage
    a metal screw that tapers to a point so that it can be driven into wood with a screwdriver
    screw thread on a gear with the teeth of a worm wheel or rack
    gudgeon pin, wrist pin
    pin joining a piston to a connecting rod
    type of:
    constraint, restraint
    a device that impede's something's motion
  2. noun
    a person who fastens or makes fast
    “he found the door fastened and wondered who the fastener was”
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