This screw and screw head guide covers the full range of screw head types, screw categories by application, drive types, and materials — so you can identify any screw, understand its purpose, and choose the right fastener for the job. Screws are categorized by application, head type, and drive type: matching all three to the task produces a stronger, cleaner connection.

Screw Anatomy: Head, Shank, Thread, and Point

Every screw shares the same basic anatomy. The screw head houses the drive recess for tools and provides the bearing surface against the material. The shank connects the head and threads — on some screws the shank is partially unthreaded for a cleaner connection in the top material. Screw threads provide friction and grip to hold materials together. The screw point is designed to penetrate materials easily — sharp points for wood and soft materials, drill points for metal.

Types of Screw Heads

Flat Head (Countersunk)
Flat head screws have a tapered underside that pulls the head flush with or below the material surface when fully driven into a countersunk hole. Countersunk head screws sit flush with the surface for a smooth finish, eliminating snagging hazards and providing a clean appearance. They are used in cabinetry, furniture, hinges, and any application requiring a flush finish. 

Pan Head
Pan head screws are rounded on top and project above the surface — the flat underside distributes clamping load across a broad area without requiring a countersunk hole. Pan head screws are the most common screw head type for machine screws and sheet metal screws. They provide more bearing area than flat heads and are used in electrical enclosures, brackets, appliance panels, and metal-to-metal connections.

Round Head
Round head screws have a fully domed profile and a flat underside. They sit proud of the surface and are used decoratively or in thin materials where countersinking would break through. Round head screws were the historical standard before pan heads became common and are still used in decorative ironwork, antique furniture reproduction, and vintage-style hardware applications. Pan and round heads are both non-countersinking options; round heads have a taller dome profile than pan heads.

Oval Head (Raised Head)
Oval head screws, also called raised head screws, partially countersink — the tapered underside sits in a countersunk hole, but the domed top remains slightly above the surface. Oval head screws provide an aesthetic finish while being partially exposed, combining the flush seating of a flat head with the visible dome of a round head. They are used in decorative hardware, hinges, and furniture where a small visible dome adds visual refinement.

Hex Head
Hex head screws have a six-sided surface for driving with a wrench or socket — providing the highest torque capacity of any screw head style. Hexagon head screws allow for high torque applications and are used in heavy-duty machinery, structural connections, lag bolt applications, and anywhere a recess drive would strip. Hexagon head bolts are widely used in structural engineering and manufacturing. Hex head screws can also be driven with hex sockets for automated or high-volume assembly.

Cap Head (Socket Cap)
Cap head screws have a cylindrical head with an internal hex (Allen wrench) socket. Cap head screws provide high torque for secure fastening in a compact head profile — the small cylindrical head allows installation in counterbored holes that completely conceal the fastener. Cap heads are crucial in aerospace and automotive industries and widely used in precision engineering, machinery, and any application requiring high clamping force in a small envelope. 

Button Head
Button head screws have a low-profile domed head with an internal hex socket — lower than a cap head, with a wider bearing flange. Button head screws offer better accessibility in tight spaces and a lower snag profile than cap heads. Button head screws are favored in consumer electronics and furniture assembly where aesthetics and low profile matter.

Truss Head
Truss head screws have an extra-wide, low-profile dome head — wider than a pan head — providing maximum bearing area against the material. Because the wide head distributes load over more surface area than standard pan or flat heads, truss head screws are used when the material is soft or easily crushed, or when a large washer-like bearing surface is needed without a separate washer. Truss head screw applications include cabinetry, pocket-hole joinery, wire management, thin sheet metal, and agricultural applications.

Bugle Head
Bugle head screws are the standard for drywall — the bugle head is designed to countersink into the drywall paper without tearing through it. The curved underside of the bugle transitions smoothly into the countersink, setting the head just below the paper surface in a controlled dimple. Bugle heads are also used in decking screws for similar reasons.

Flange Head (Washer Head)
Flange head screws have a washer-like flange integrated into the underside of the head — eliminating the need for a separate washer. The flange distributes load and prevents the head from pulling through soft materials. Flange head screws combine the convenience of a built-in washer with positive bearing against the material surface and are common in automotive, HVAC, and sheet metal applications.

Undercut Head
Undercut head screws have a reduced head height that allows the screw to sit in shallow counterbores where a full-height head wouldn't fit. They are used in precision engineering and electronics assembly where stack height is critical.

Cheese Head
Cheese head screws have a flat top, flat underside, and cylindrical sides — resembling a round block of cheese. They provide moderate torque capacity and a clean appearance, used in precision electronics, instruments, and applications requiring a slotted drive with some head height for accessibility.

What Are the Four Types of Screw Heads?

The four foundational screw head categories are countersunk (flat head, oval head), pan head, hex head, and cap/socket head. These four cover the vast majority of fastening applications — countersunk for flush finish, pan for surface bearing, hex for high torque with wrench drive, and cap/socket for high torque in confined spaces.

Types of Screws by Application

Wood Screws
Wood screws have a smooth shank and coarse threads for gripping wood. The unthreaded shank in the upper portion allows the top board to be pulled tight against the bottom board without thread resistance in the top material. Wood screws are commonly made from carbon steel, stainless steel, or brass for different applications — stainless steel screws are ideal for outdoor and wet environments.

Machine Screws
Machine screws are used with pre-tapped holes or nuts for metal connections. They have uniform threads from head to tip and are used in metal assemblies, electronics, and machinery. Machine screw head types include pan, flat, round, oval, hex, and cap head in both slotted and Phillips drive.

Sheet Metal Screws
Sheet metal screws have sharp threads designed to grip metal. They are self-tapping, cutting their own threads as driven. Available in Type A, B, and AB thread profiles for different metal gauges.

Drywall Screws
Drywall screws have a bugle head and are designed for fastening drywall to wood or metal studs. Coarse thread for wood studs; fine thread for metal. Drywall screws are not suitable for structural applications.

Concrete Screws
Concrete screws are designed for fastening items to concrete, brick, or block. They cut threads directly into masonry with a hardened thread that resists stripping.

Lag Screws
Lag screws are heavy-duty fasteners used for maximum holding power in construction — attaching heavy timber, ledger boards, and post bases. Lag screws feature a hex head and coarse thread and are driven with a wrench or socket.

Set Screws (Grub Screws)
Set screws are headless — they are fully threaded and driven into a tapped workpiece until flush or below the surface. Grub screws are commonly used in electronics and precision engineering to lock shafts, collars, and gears in position. They are driven with an Allen wrench through an internal hex socket.

Captive Screws
Captive screws are retained in a panel or fixture — they can be loosened and re-tightened without being fully removed, making them ideal for panels requiring quick and frequent modifications or access. Common in electronics enclosures and rack-mount equipment.

Drive Types

Drive types determine which tools can be used to drive the screws. Major drive types include: 

• Slotted drive (single slot, oldest style, minimal torque)
• Phillips head (cross-shaped recess, most common in consumer hardware)
• Pozidriv (improved Phillips with additional ribs, less cam-out compared to Phillips)
• Square drive / Robertson (square recess, better grip and less cam-out than Phillips)
• Torx drive (six-pointed star, highest torque transfer, resists stripping)
• Hex socket / Allen wrench drive (used in cap and set screws). 

Drive type and head type are independent variables — a pan head screw can have a Phillips, Torx, or square drive, for example.

Screw Materials

Zinc-plated steel is commonly used for indoor screws to prevent rust. Stainless steel screws are ideal for outdoor and wet environments. Brass screws are used in decorative and marine applications. Hardened steel screws (case-hardened) are used for drywall and concrete. Choosing the right screw for different materials is essential for structural integrity — screw material determines corrosion resistance, hardness, and compatibility with the substrate.

Screw Length Selection

Screw length should typically be 1.5 to 2 times the thickness of the material being attached. This ensures adequate thread engagement in the base material while minimizing breakthrough risk. For countersunk screws, the full length including the head goes into the material; for protruding-head screws, measure from under the head to the tip for the effective penetration depth.

Shop All Screw Types at jakesales.com

Find wood screws, sheet metal screws, drywall screws, lag screws, concrete screws, and specialty fasteners in every head type, drive type, and material at jakesales.com. The right screw for every application, from precision electronics to heavy structural timber connections.