Fastener Dictionary

Fastener Dictionary

A

  • ACQ (Alkaline Copper Quaternary): A wood preservative used in pressure-treated lumber. ACQ-treated wood is corrosive to many metals, requiring compatible fasteners such as hot-dip galvanized or stainless steel.
  • Allen: A hexagonal internal drive requiring an Allen wrench or hex key.
  • Alloy: A metallic substance made by blending two or more elements that is typically harder or more corrosion-resistant than pure metals.
  • Aluminum: A lightweight, corrosion-resistant metal used in some fasteners and washers.
  • Anchor: A fastener designed to secure objects into concrete, masonry, drywall, or hollow materials.
  • Anodic Materials: Active metals such as zinc and aluminum that are prone to galvanic corrosion and often used in coatings to protect the material below.

B

  • Backing Out: Fasteners withdrawing from a material.
  • Bearing Surface: The area where a fastener head contacts material to transfer load.
  • Bolt: A flat-tipped fastener with helical threads, often used with a threaded nut.
  • Brass: A copper-zinc alloy known for corrosion resistance and decorative appearance.
  • Bright: A finish with little or no protective coating, giving the metal a bright, shiny appearance.
  • Brittleness: A material's likeliness to break, split, or shatter under stress.
  • Bronze: A corrosion-resistant copper-based alloy often used in marine applications.

C

  • Calipers: A measuring tool used to determine diameter, thickness, and length.
  • Cam Out: When a driver bit slips out of the recess during installation.
  • Carbide: A compound made of metal and carbon that is extremely hard and heat-resistant.
  • Carbide Bit: A drill bit tipped with carbide for drilling hard materials.
  • Carbon: An element commonly used in steel alloys to increase strength and hardness.
  • Carbon Steel: Steel primarily composed of iron and carbon.
    • High-Carbon Steel: Steel with a high carbon content that is extremely hard and brittle.
    • Low-Carbon Steel: Steel with a low carbon content that is softer and more flexible.
  • Carriage Bolt: A bolt with a smooth, domed head and a square neck, usually used with a nut to connect materials.
  • Cathodic Materials: Metals that are less reactive and resist galvanic corrosion, such as stainless steel, titanium, brass, and copper.
  • Cement Board: A cement-based panel used under tile and exterior finishes.
  • Clamping Force: The compressive force created when a fastener is tightened.
  • Coating: A layer of material applied to the surface of a fastener.
    • Ceramic Coating: A corrosion-resistant coating often applied to exterior fasteners.
    • Duplex Coating: A combination of hot-dip galvanizing and a paint or powder coating.
    • Nano Coating: An ultra-thin protective coating that improves corrosion resistance.
    • Vinyl Coating: A polymer coating that improves driving ease and holding power.
    • Zinc-Aluminum Coating: A dual coating that protects against galvanic corrosion and heat damage.
  • Collated Nails: Rows of nails joined together in strips or coils for use in nail guns.
  • Common Nail: A standard nail with a thick shank and flat head used in framing and general construction.
  • Concrete Screw: A screw designed to anchor connections in concrete.
  • Composite: A material made from two or more components, such as composite decking.
  • Connection: The joint formed by two or more materials fastened together.
  • Copper: A soft, highly conductive, and corrosion-resistant metallic element.
  • Corrosion: The deterioration of metal due to chemical or environmental exposure.
    • Galvanic Corrosion: Corrosion caused by contact between incompatible metals along with moisture or saltwater.
  • Countersinking: Driving a fastener to sit flush or below the surface after installation.
    • Countersinking Fastener: A fastener with a head designed to sink into material.
    • Non-Countersinking Fastener: A fastener with a head designed to sit above the surface.

D

  • Deck Screw: A coarse-thread screw designed for use in composite decking.
  • Deformation: Change in shape caused by stress or load.
    • Elastic Deformation: Temporary change that resolves when stress is removed.
    • Plastic Deformation: Permanent change that cannot be reversed.
  • Density: Mass per unit volume of a material.
  • Diameter: The width of a fastener measured across its widest section.
    • Major Diameter: The outside diameter measured across thread crests.
    • Minor Diameter: The diameter measured between thread valleys.
  • Drag: Resistance encountered while driving a fastener.
  • Drill: A tool used to create pilot holes or drive fasteners.
  • Drill Point: A fastener point designed to drill its own hole during installation.
  • Drive: The feature on the head used to apply torque and install the fastener.
    • Phillips Drive: A cross-shaped drive style.
    • Slotted Drive: A single-slot drive style.
    • Star Drive: A six-lobed drive design commonly called Torx.
    • Square Drive: A four-sided drive recess, also called Robertson.
  • Driver: The tool that delivers torque or impact to insert a fastener.
  • Drywall Screw: A countersinking screw designed to hold lightweight materials.
  • Ductility: A material's ability to stretch and bend permanently under stress.

E

  • Elasticity: A material's ability to return to its original shape after being deformed under stress.
  • EPDM (Ethylene Propylene Diene Monomer): A durable synthetic rubber commonly used in sealing washers for metal roofing screws.
  • Exterior Fasteners: Designed to withstand weather exposure in outdoor environments.

F

  • Failure: Loss of a fastener's ability to perform as intended.
    • Fatigue Failure: Failure caused by gradual weakening from repeated loads.
  • Fastener: Hardware used to join two or more objects together.
  • Finish Nails: Small-headed nails designed for trim and finish carpentry.
  • Framing: The structural framework of a building.
  • Free Shipping: Available for all orders through Jake Sales within the contiguous United States.

G

  • Galvanized: Coated with zinc to reduce corrosion on the fastener.
    • Electrogalvanized: A thin, smooth zinc coating applied through electroplating.
    • Hot-Dip Galvanized: A thicker zinc coating applied via immersion in molten zinc.
  • Gauge: A numerical sizing system used for screws, nails, and wire.

H

  • Hardness: A material's ability to resist deformation under stress.
  • Head: The portion of a fastener that receives driving force and provides bearing surface.
    • Bugle Head: A concave countersunk head commonly used on drywall and wood screws.
    • Button Head: A low-profile rounded head.
    • Clipped Head: A nail head with one side removed to increase capacity in collated nails.
    • Flat Head: A countersunk head designed to sit flush with the surface.
    • Full Head: A complete round nail head.
    • Hex Head: A six-sided head driven by a wrench or socket driver.
    • Pancake Head: An extra low-profile round head.
    • Tapered Head: A head that gradually narrows.
    • Trim Head: A small-diameter countersunk head for finish and detail work.
    • Truss Head: An extra-wide low-profile head.
    • Wafer Head: A broad, thin head used for sheet metal and wood applications.
    • Waffle Head: A nail head with a crosshatched pattern to prevent slippage.
  • Heat Treated: Strengthened through controlled heating and cooling.
  • Hi-Lo Thread: A thread design with alternating high and low threads.
  • Holding Power: A fastener's resistance to pull-out and movement.

I

  • Impact Driver: A power tool that drives fasteners through rotational impacts.
  • Interior Fasteners: Designed for indoor applications with limited moisture exposure.

J

  • Joint: The point where two or more materials are connected.

K

  • Knurl: Raised edges on a fastener shaft designed to facilitate installation.

L

  • Lag Screw: A heavy-duty structural screw designed to hold large loads.
  • Low Profile (Lo Pro): A head design with reduced height above the surface.

M

  • Marine Fasteners: Fasteners made to resist corrosion from saltwater, typically made from high-quality stainless steel.
  • Metal: A hard material used to create fasteners for strong connections.
  • Mini Driller: A small self-drilling point designed to speed up start times in thin metal.
  • Mushrooming: Bulging caused by material moving upward during fastener installation; common in composite decking.

N

  • Nail: A pointed fastener driven by impact on the head.
  • Nailer: A power tool used to drive collated nails.
  • Neoprene: A synthetic rubber formerly used in roofing hardware; largely replaced by EPDM.
  • Notched Point: A screw point with a vertical notch to reduce splitting and speed up start times.
  • Nut: A small threaded piece of metal used with a bolt to clamp materials together.
  • Nylon: A durable synthetic polymer used to protect fasteners from abrasion.

O

  • Overdriving: Driving fasteners too deep, reducing shear strength and risking moisture leaks.
  • Overtightening: Applying excessive torque, potentially causing stripping, breakage, or material damage.
  • Oxidation: The reaction that occurs when metals are exposed to oxygen, resulting in rust formation.
  • Ozone: A naturally occurring gas that can degrade some rubber materials over time.

P

  • Pallet: A platform used for shipping and storing bulk products.
  • Penny Size: A standardized nail sizing system abbreviated "d".
  • Pilot Hole: A pre-drilled hole that guides a fastener during installation.
  • Pitch: The distance between adjacent threads on a fastener.
  • Point: The leading end of a fastener.
  • Polyurethane: A durable polymer used in coatings to extend fastener life.
  • Pre-Drilling: Drilling a hole before installing a fastener.
  • Pressure-Treated Lumber: Wood infused with chemical preservatives to resist decay and insect damage.
  • Proof Load: The maximum tensile force a fastener can withstand before permanently deforming.
  • Pull-Out Strength: Resistance against a fastener withdrawing from material.
  • Pull-Through Strength: Resistance against a fastener head pulling through material.

R

  • Reamer Tek: A winged drill point that widens the hole to reduce thread engagement in the top material. Wings break off at contact with metal.
  • ReGrip: Thread design intended to increase holding power in loosened connections.
  • Roofing Screws: Screws designed for metal roofing and siding applications.
  • Rust: Iron oxide formed when steel is exposed to moisture and oxygen.

S

  • Salt Spray Test: A laboratory corrosion test that exposes fasteners to a salt fog environment.
  • Screw: A threaded fastener that transfers torque into clamping force to hold materials together.
  • Self-Centering: A symmetrical drive that helps align the fastener and driver.
  • Self-Starting: Fasteners with a drill bit tip that can be installed without a pilot hole.
  • Self-Tapping: Fasteners that cut mating threads during installation.
  • Shaft: The main, elongated body of a fastener between the head and point.
  • Shank: The body of a nail or screw that connects with material.
    • Ring Shank: A nail shank with ringed grooves or ridges for increased holding power.
    • Smooth Shank: A plain nail shank without textured pattern.
  • Shear Strength: A fastener's ability to resist lateral forces acting across the body.
  • Shoulder: An enlarged section between the head and thread of a fastener.
  • Silicone: A weather-resistant synthetic material used in sealants and coatings.
  • Sinker Nail: A framing nail with a thinner shank and smaller head than a common nail.
  • Spike Nail: A large-diameter nail used for heavy timber and landscaping.
  • Splitting: Material cracking during fastener installation.
  • Standing Seam: A metal roofing style that conceals fasteners under raised ridges.
  • Stitch Tek: A self-drilling screw designed to connect thin materials.
  • Steel: A metal alloy of iron and carbon.
    • Alloy Steel: Steel containing additional alloying elements.
    • Tempered Steel: Heat-treated steel designed for increased hardness and toughness.
    • Stainless Steel: A corrosion-resistant steel containing chromium.
  • Stress: Forces on a material caused by external loads.
  • Stripping: Damage to threads or drives caused by excessive force.
  • Structural Screw: Large screws designed to bear heavy loads.
  • T

    • Tensile Strength: The maximum pulling force a fastener can withstand before failure.
    • Thread: The winding ridge on a fastener that creates clamping force.
      • Coarse Thread: A thread pattern with fewer threads per inch and deeper thread depth.
      • Fine Thread: A thread pattern with more thread per inch and shallower thread depth.
      • Thread Crest: The highest point on a thread ridge.
      • Thread Valley: The lowest point between threads.
    • Thread Engagement: The amount of contact area between a fastener's threads and the material.
    • Thread Form: The shape, angle, and dimensions of a fastener's threads.
    • Threads Per Inch (TPI): The number of thread ridges within one inch.
    • Tightening: Applying torque to create clamping force.
    • Titanium: A lightweight, highly corrosion-resistant metal.
    • Torque: Rotational force that drives a fastener.
      • Applied Torque: Torque delivered by the driver.
      • Resistive Torque: Torque from friction and material resistance that opposes applied torque.

    U

    • UV Radiation: Ultraviolet light from the sun that can degrade some materials over time.
    • Undertightening: Applying insufficient torque to achieve proper clamping force.

    W

    • Walking: Unintentional fastener movement before penetration.
    • Washer: A piece placed beneath a fastener head or nut to distribute load or create a seal.
    • Wing: Projections on a screw shaft that ream a wider insertion hole.
    • Wire: A long strand of metal used to manufacture fasteners.
    • Wood: A natural material commonly fastened with screws and nails.
      • Hardwood: Wood from deciduous tress that is typically denser and more rigid.
      • Soft Wood: Wood from coniferous trees that is typically more flexible.
      • Treated Wood: Wood treated with preservatives to resist decay and insects.
    • Wood Screw: A multipurpose screw designed for use in wood connections.

    Y

    • Yield Strength: The maximum stress a fastener can withstand before permanent deformation.

    Z

    • Zinc: A corrosion-resistant metal commonly used as a protective coating on steel fasteners.
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