Comprehensive Screws Buying Guide | Lowe's

Wood Screws
Wood screws are sharp-pointed screws for nonstructural, wood-to-wood fastening. Wood screws have coarse threads and an unthreaded shank near the head, which allows the screw to pull the wood pieces tightly together.

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Cement Board Screws
Cement board screws are fully threaded screws that secure backer board to wall studs or a subfloor for tile projects. They have a coating that resists corrosion from moisture and mortar. You can find cement board screws for wood, metal or both.

Drywall Screws
Drywall screws are fully threaded screws for interior projects, such as securing drywall to studs. Coarse-threaded screws are for hanging drywall on wood studs, while fine-threaded screws work with metal studs. Drywall screws don’t have the strength to support cement board and tile.

Deck Screws
Deck screws are designed for decks, fencing and other outdoor construction projects. Deck screws are either made for use on wood or composite materials. Wood deck screws have a coarse-threaded portion and an unthreaded shank, like standard wood screws. Composite deck screws have finer threads and smaller heads. Some have a second set of threads to prevent the composite material from mounding at the screw head.

Lag Screws or Lag Bolts
Lag screws fasten heavy materials or components that handle large loads. Lag screws/bolts have hex heads, so they require a wrench or socket and ratchet to install. You may also see eye lag screws, which are simply wood screws with a ring at the head for securing rope or chain. They can’t carry the load a lag screw or bolt can.

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Structural Wood Screws
Structural wood screws have a design, like wood screws, with coarse threads and an unthreaded shaft. However, they’re much stronger than basic wood screws. Depending on building codes, they can function like lag screws or bolts.

Machine Screws
Machine screws are fully threaded screws that secure metal components together.
Socket cap screws are machine screws that have a raised, cylindrical, hex-socket head.
Socket set screws are headless with an internal hex socket.

Sheet Metal Screws
Sheet metal screws are fully threaded screws designed to fasten sheet metal or sheet metal and softer materials. Some are designed for use with pre-drilled holes, and they’re also available with self-drilling points.

Concrete Screws
Concrete screws, also called concrete anchors, are designed for fastening in concrete or other masonry.

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Screw Benefits • Screws are easy to remove, which makes them great for temporary projects that may need adjustments as you work.

• Screws offer superior tensile strength. This means they're well suited for projects that are under tension or bearing weight, such as porch railings or kitchen cabinetry.

• Screws have a great resistance to withdrawal pressure, so they're perfect for adhering surfaces that tend to pull apart.

• Screws grip into wood and draw boards together tightly to hold during wood's natural expansion and contractions.

• Screws are the preferred fastener for all of the following applications: hanging drywall, attaching ledger boards, installing cabinets, decks, woodworking projects, and any wood-to-wood connection that may need to be taken apart.
Screw Length & Size Screw Length

The general rule of thumb is at least 2/3 of the screw length should end up in the underlying piece for sufficient holding power. If the underlying material is thinner, then your screw should pass through the first layer and come within no more than 1/8'' of the far side of the underlying material. Any closer and the tip could create a small, raised bump that you likely won't see until the finish is on your project. Screw Size

The screw size refers to the thickness of the screw shank and is designated with a # sign followed by a number. The larger the number, the thicker the shank of the screw and the more load it can support. Common Applications

#0 - #5 are great for delicate projects and general hardware installation

#6 - #10 are great for general-purpose joining of panels and are popular sizes for pocket hole screws

#12 and larger are great for decking, construction, and cabinet installation Screw Size to Decimal Conversion

#0 - 0.06"
#1 - 0.073"
#2 - 0.086"
#3 - 0.099"
#4 - 0.112"
#5 - 0.125"
#6 - 0.138"
#7 - 0.151"
#8 - 0.164"
#9 - 0.177"
#10 - 0.19"
#12 - 0.216"
#14 - 0.25"