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Flat Head Screws

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Hex Drive Flat Head Screws are fasteners with a flat head that is designed to sit flush with or below the surface of the material they are being driven into. The hex drive refers to the six-sided socket on the screw's head, allowing for easy insertion or removal using a hex key or Allen wrench.

Phillips Flat Head Screws

Phillips Flat Head Screws are fasteners with a flat head designed to sit flush with the surface, featuring a Phillips cross-shaped drive for easy tightening, commonly used in woodworking, construction, and general-purpose applications where a smooth, finished surface is needed.

Torx Flat Head Screws

Torx Flat Head Screws are fasteners featuring a star-shaped Torx drive and a flat head for flush installation. The Torx drive provides superior torque transfer, reducing the risk of cam-out compared to Phillips or slotted drives. These screws are commonly used in applications requiring high precision and torque, such as electronics, automotive, and machinery assembly.

Slotted Flat Head Screws

Slotted Flat Head Screws are fasteners with a single straight-line drive slot and a flat head designed to sit flush with or below the surface of the material. These screws are commonly used in woodworking, construction, and general-purpose applications, providing a smooth finish once installed. The slotted drive is simple but may require careful handling to avoid slippage during installation.

Tamper-Resistant Flat Head Screws

Tamper-Resistant Flat Head Screws are designed to prevent unauthorized removal or tampering. They feature a unique drive design, such as a pin-in-the-center or one-way drive, combined with a flat head for flush installation. These screws are commonly used in security applications, public installations, and machinery where safety and integrity are a priority.

Vibration-Resistant Flat Head Screws

Vibration-resistant flat head screws are specialized fasteners designed to prevent loosening in high-vibration environments, featuring a flat head for a flush finish and often incorporating locking mechanisms such as nylon inserts, thread lockers, or serrations for enhanced grip and stability.

Sealing Flat Head Screws

Sealing flat head screws are designed with an integrated sealing element, such as a rubber or silicone washer, to provide a watertight or airtight seal when installed, making them ideal for applications requiring protection against moisture, dust, or fluid leakage.

Vented Flat Head Screws

Vented flat head screws are fasteners with a hole drilled through their center, allowing gases or liquids to pass through during installation, making them ideal for vacuum or pressure-sensitive applications, such as in laboratory equipment, clean rooms, or aerospace industries.

Left-Hand Threaded Flat Head Screws

Left-Hand Threaded Flat Head Screws are specialized fasteners with a flat head design, allowing them to sit flush with or below the surface of the material they are fastening. The left-hand thread means these screws tighten counterclockwise, which is opposite to standard screws.

LILY Bearing stocks flat head screws with a countersunk, 82° angled underside that lets the head sit flush with (or below) the surrounding material when driven into a matching countersunk or countersink-formed hole. Screws are available in slotted, Phillips, hex drive, and Torx drive styles, plus tamper-resistant, vibration-resistant, vented, sealing, and left-hand threaded variants. Use the filters below, or the comparison table, to narrow down by drive style, material, thread size, and length.

Compare by Drive Style

Drive Style	Driven With	Best For	Watch Out For
Slotted	A flat-blade screwdriver	Traditional or decorative hardware, low-torque applications	The driver can slip out of the slot (cam-out) under higher torque
Phillips	A Phillips (cross-point) screwdriver	General-purpose assembly where a widely available driver is convenient	Also prone to cam-out at higher torque, though less than slotted
Hex Drive	A hex key (Allen wrench)	Higher-torque applications needing a more secure grip than Phillips or slotted	Requires the correct hex key size on hand to install or remove
Torx	A Torx (star-shaped) driver	High-torque assembly where cam-out resistance and consistent torque transfer matter most	Requires a Torx driver in the matching size

Feature Variants

Beyond the standard countersunk design, LILY Bearing stocks several purpose-built variants: tamper-resistant screws with a drive style that resists removal by standard tools, vibration-resistant screws that stay tight under repeated shock and vibration, vented screws with small channels to let air or gas escape, and sealing screws for leak-tight joints. Left-hand threaded versions are also available for counter-rotating assemblies.

Need a Custom Flat Head Screw?

Don't see the drive style, material, or feature you need? Our team can cross-reference an existing part or quote a custom configuration. Request a Quote or Contact Us. LILY Bearing also offers customized fastener services.

Frequently Asked Questions

Does a flat head screw need a countersunk hole?

Yes. A flat head screw's underside is angled at 82° so the head sits flush with the surrounding surface. For it to seat properly, the hole must be countersunk to the same angle — either pre-drilled with a countersink bit, or (in soft materials like wood or plastic) formed by the screw itself as it's driven in. Without a matching countersink, the head will sit proud of the surface or the material around the hole may crack.

Which drive style should I choose for a flat head screw?

Choose slotted or Phillips for light-duty or general assembly where driver availability matters most. Choose hex drive or Torx for higher-torque applications, since both resist cam-out (the driver slipping out of the head) better than slotted or Phillips — Torx offers the best torque transfer and cam-out resistance of the four.