Wood Screws
Wood screws are designed specifically for connecting wood to wood. They have a smooth shank that allows the top piece of wood to be pulled tightly against the underlying piece without being damaged.
Common Sizes
Length: 1/2″ to 6″
Diameter: #2 to #20
Head Types: Flat, round, oval
Machine Screws
Machine screws are used with nuts or drilled and tapped holes. They are used to fasten metal parts together and come in various head styles.
Common Sizes
Length: 1/8″ to 3″
Diameter: #0 to #14
Head Types: Flat, round, pan, oval, truss, hex, fillister, and socket
Sheet Metal Screws
Sheet metal screws have sharp threads that cut into metal, plastic, or wood. They are used to fasten metal sheets to other materials.
Common Sizes
Length: 1/4″ to 3″
Diameter: #2 to #14
Head Types: Pan, flat, oval, truss, hex, and binding
Self-Tapping Screws
Self-tapping screws are designed to tap their own hole as they are driven into materials such as metal, plastic, or wood.
Common Sizes
Length: 3/8″ to 4″
Diameter: #4 to #14
Head Types: Pan, flat, hex, and truss
Deck Screws
Deck screws are specifically designed for outdoor use in decking applications. They typically have a corrosion-resistant coating and sharp points.
Common Sizes
Length: 1-1/4″ to 6″
Diameter: #8 to #10
Head Types: Flat, bugle
Drywall Screws
Drywall screws are used to attach drywall to wood or metal studs. They have a bugle-shaped head that allows the screw to sink flush with the drywall surface.
Common Sizes
Length: 1″ to 3″
Diameter: #6 to #10
Head Types: Bugle
Lag Screws
Lag screws, also known as lag bolts, are heavy-duty screws used to fasten wood, especially in structural applications.
Common Sizes
Length: 1″ to 8″
Diameter: 1/4″ to 1/2″
Head Types: Hex
Concrete Screws
Concrete screws are designed to fasten materials to concrete, brick, or block. They have a hardened steel design and a unique thread pattern.
Common Sizes
Length: 1-1/4″ to 6″
Diameter: 3/16″ to 3/8″
Head Types: Flat, hex
Set Screws
Set screws are used to secure an object within or against another object, such as securing a pulley or gear to a shaft.
Common Sizes
Length: 1/8″ to 1-1/2″
Diameter: #4 to 1/2″
Head Types: Cup, flat, cone, oval, half dog, and full dog
Security Screws
Security screws have a specialized design to prevent unauthorized removal. They are used in applications where tampering needs to be prevented.
Common Sizes
Length: 1/2″ to 3″
Diameter: #4 to #14
Head Types: Pin-in-torx, pin-in-hex, pin-in-socket, one-way, and spanner