Self-Drilling Screws for Steel Roofing
Self-drilling screws save time by eliminating the need for pre-drilling while delivering strength, durability, and weather resistance. At USFITC, through our collaboration with Elevate International Co., Ltd. (Taiwan), we offer specialized screws designed for roofing, siding, and structural applications.
Below, we break them down by head style and function, so you can select the right fastener for your next steel roofing project.
1. Indented Hex Washer Head Screws
The largest category, indented hex washer head screws, are the standard for roofing applications. Their built-in washer spreads load evenly, reducing risk of panel damage.
Thread Types: CSD, BSD, BSD-BSD, ASD, and mixed configurations
Points: No. 1, 2, 4, and 5 self-drilling points for different steel thicknesses
Materials: Carbon steel, stainless steel, and stainless with EPDM/black washers
Applications:
Attaching steel roofing panels to purlins
Penetrating light- to heavy-gauge steel
Projects requiring corrosion resistance (stainless versions)
Examples from our lineup:
No. 4 Point for medium-thickness steel
No. 5 Point for heavy structural steel
Stainless washer + black EPDM for leak resistance and aesthetics
2. Low Profile Truss Head Screws
These screws provide a wide bearing surface and a flush, low-profile finish, reducing pull-through on thin materials.
Thread Types: BSD, CSD, BSD-BSD
Applications:
Fastening trim and lighter gauge steel roofing
Decorative or visible installations where a smooth finish matters
Examples from our lineup:
Type BSD-BSD, No. 3 Point — excellent for double-sheet fastening
Type CSD, No. 5 Point — strong penetration with a clean look
3. Bugle Head Screws
Bugle head screws feature a smooth, curved design to reduce surface damage.
Thread Type: BSD
Point: No. 1 Reduced Point
Application:
Attaching softer or thinner materials (e.g., gypsum or insulation) to steel roofing without tearing
4. Wafer Head Screws
Wafer head screws offer a large, flat bearing surface, ideal where countersinking isn’t desired.
Thread Type: CSD
Point: No. 5
Application:
Securing insulation boards or accessories to steel roofing
5. Indented Hex Flange Washer Head Screws
Flange washer head screws combine washer support with a flange base, improving vibration resistance.
Thread Types: BSD and CSD
Applications:
Structural steel framing
Heavier roofing applications needing more load distribution
Examples:
BSD-BSD for double sheet fastening
CSD for consistent, secure penetration
6. Indented Hex Cupped Washer Head Screws
Cupped washer heads provide deep seating and excellent weatherproofing.
Thread Types: BSD and CSD
Applications:
Areas prone to water exposure or uplift forces
Roofing panels where long-term sealing is essential
Examples:
Type BSD-BSD for dual-sheet fastening with cupped washer support
Type CSD for secure, watertight penetration into heavy-gauge steel
Why So Many Variations?
Every roofing project has different requirements: steel thickness, panel design, exposure conditions, and structural demands. That’s why we offer at least 29 distinct screws across multiple categories—so contractors always have the right head style, thread type, and drill point for the job.
From the versatile Indented Hex Washer Head to the specialized Bugle, Wafer, Flange, and Cupped Head screws, our lineup covers every roofing scenario. Whether you’re securing trim, attaching panels, or anchoring into heavy-gauge steel, there’s a self-drilling screw designed to make your work faster, cleaner, and more reliable.
Contact us for a quote.