Rounded Head Screws
8967 Products
LILY Bearing stocks 8,967 rounded head screws across five drive styles — hex drive, Phillips, slotted, Torx, and combination Phillips/slotted — and several head shapes, including pan, button, truss, cheese, and binding head. Flanged, vibration-resistant, tamper-resistant, sealing, vented, and left-hand threaded variants are also available. Use the filters below, or the comparison table, to narrow down by drive style, head shape, 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, electrical connections | 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 |
| Combination Phillips/Slotted | Either a Phillips or flat-blade screwdriver | Field service or maintenance work where driver availability is uncertain | Shares the cam-out tendencies of both Phillips and slotted |
Head Shape Options
| Head Shape | Best For |
|---|---|
| Pan | The most common rounded head style — a flat top and short rounded sides for general-purpose fastening |
| Button | A smooth, low dome for a finished appearance in high-strength applications |
| Truss | A wide, flat bearing surface that spreads clamping force to avoid crushing thin or soft materials |
| Cheese | A narrow, low-profile head with a deep slot for maximum driving torque in tight spaces |
| Binding | An extra-wide head sized to trap wires and terminals securely — common in electrical connections |
| Decorative Round | A domed, polished-looking head for visible fixtures, furniture, and hardware |
| Sanitary Extra-Wide Truss | Food, pharmaceutical, and other hygienic environments — a smooth, crevice-free truss head with wrench flats built in |
Flanged Rounded Head Screws
Flanged rounded head screws add a built-in flange under a button head to distribute clamping pressure over a wider area, eliminating the need for a separate washer. Alloy steel versions offer nearly twice the strength of stainless steel button head screws.
Vibration-Resistant Variants
These pan head screws come pre-assembled with a captive, freely rotating washer — commonly called a Sems screw. Split lock and spring lock washers flatten under compression to add tension that resists loosening from vibration. External-tooth washers use sharp teeth around the outer edge to bite into the bearing surface for maximum holding power, while internal-tooth washers bite from the inner edge instead, leaving a smoother outer edge for a more finished look. A flat washer and split lock washer combination is also available for added load distribution alongside vibration resistance.
Tamper-Resistant Variants
Tri-Groove screws use three angled grooves in the head that require a specialized driver to install or remove, resisting tampering by standard tools. One-Way screws use an angled slot that lets a driver tighten the screw but slips when turned the other way, preventing removal entirely once installed.
Other Application-Specific Variants
Sealing screws create a leak-tight joint, vented screws include small channels to let air or gas escape or enter the assembly, and left-hand threaded screws are turned counterclockwise to tighten, for counter-rotating assemblies.
Need a Custom Rounded Head Screw?
Don't see the drive style, head shape, or material 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
What is the difference between a pan head, button head, and truss head screw?
A pan head has a flat top with short rounded sides and is the standard, general-purpose choice. A button head is a smooth, low dome shape, often chosen for its finished appearance in high-strength applications. A truss head is wider and flatter than either, spreading clamping force over a larger area to avoid crushing thin or soft materials.
What is a Sems screw?
A Sems screw is a screw pre-assembled with a captive washer that rotates freely but can't be removed from the screw. Vibration-resistant rounded head screws with a split lock, spring lock, external-tooth, or internal-tooth washer are all Sems screws — they save an assembly step versus installing the screw and washer separately.
