Why Choose Hex Washer EPDM Head Self Drilling Screws?
Hex washer EPDM head self drilling screws are useful when an application needs a screw that can drill, fasten, and help seal the connection in one installation step. The drill point creates the hole before the threads engage, while the bonded EPDM washer helps seal around the fastener head when properly installed.
The hex washer head can be driven with a socket or nut driver, giving installers strong external tool engagement. This makes these screws a practical choice for roofing, siding, panel, and sheet metal applications where controlled installation and a sealing washer are both important.
Common Uses for Hex Washer EPDM Head Self Drilling Screws
Hex washer EPDM head self drilling screws are commonly used for metal roofing panels, siding panels, sheet metal panels, light-gauge metal, brackets, covers, fixtures, enclosures, and other panel fastening applications.
They are often selected when a bonded washer is needed to help seal the fastener location against moisture. For applications that do not require a sealing washer, a standard hex washer head self drilling screw may be a better fit.
EPDM Washer Benefits
The bonded EPDM washer helps create a seal under the screw head when the fastener is installed correctly. This is especially useful for roofing, siding, and panel applications where the screw head may be exposed.
Proper installation matters. The washer should be compressed enough to seal without being overdriven, crushed, or distorted. Overdriving can damage the washer, while underdriving may leave the seal too loose.
Hex Washer Head Benefits
Hex washer head self drilling screws provide strong external tool engagement and a wider bearing surface under the head. The hex head can be driven with a nut driver or socket, which is helpful when installing into metal panels or light-gauge steel.
The washer-style head helps seat the screw against the material. For applications that need a flush surface, a flat head or oval head self drilling screw may be a better fit.
Choosing the Right Material and Coating
410 stainless steel hex washer EPDM head self drilling screws are commonly selected when the drill point needs added hardness compared to many general stainless steel options. Zinc plated steel options are commonly used when an economical self drilling fastener is needed for dry indoor or protected applications.
Coated steel options, including Strong Shield coated steel styles, may be selected when a protective coating is preferred for the application. For roofing, siding, outdoor, wet, coastal, or corrosive environments, review the material, coating, washer, and exposure requirements before choosing the final fastener.
Self Drilling Screws vs Sheet Metal Screws
Self drilling screws include a drill point that drills the hole before the threads engage. Standard sheet metal screws are self-tapping, but they usually need a prepared hole or compatible material for the threads to form properly.
Choose self drilling screws when you want the screw to drill and fasten in one step. Choose sheet metal screws when a pilot hole is already drilled, when the material requires a specific prepared hole, or when a drill point is not needed.
How to Choose the Right Size and TEK Point
Choose the screw diameter, length, drill point, washer type, and coating based on the material thickness, holding strength needed, exposure level, and available clearance behind the workpiece. The screw should be long enough to drill through the top material and create secure thread engagement without protruding too far through the back side of the assembly.
This category includes TEK 2, TEK 3, and TEK 5 style self drilling options depending on the material and product style. Match the screw, drill point, material thickness, installation tool, and washer requirements before installation.
Related Self Drilling Screw Categories
Browse related self drilling and sheet metal screw categories to compare sealing washers, materials, coatings, head styles, and drilling options for your application.
- Self Tapping & Self Drilling Sheet Metal Screws
- Self Drilling Screws
- 410 Stainless Steel Hex Washer EPDM Head Self Drilling Screws
- Zinc Plated Steel Hex Washer EPDM Head Self Drilling Screws
- Coated Steel Hex Washer EPDM Head Self Drilling Screws
- Hex Washer Head Self Drilling Screws
- Sheet Metal Screws
Hex Washer EPDM Head Self Drilling Screw FAQs
What is a hex washer EPDM head self drilling screw?
A hex washer EPDM head self drilling screw is a fastener with a hex washer head, bonded EPDM sealing washer, and drill point that helps drill and fasten in one step.
What are hex washer EPDM head self drilling screws used for?
They are used for metal roofing panels, siding panels, sheet metal panels, light-gauge metal, brackets, covers, fixtures, enclosures, and other panel fastening applications.
What does the EPDM washer do?
The EPDM washer helps seal under the screw head when the fastener is properly installed. It is commonly used where the screw head may be exposed to moisture.
Do hex washer EPDM self drilling screws need a pilot hole?
Self drilling screws are designed to drill their own hole in compatible materials. A pilot hole is usually not needed when the screw, drill point, and material thickness are properly matched.
What is the difference between hex washer head and hex washer EPDM head screws?
Standard hex washer head screws have a hex head with a washer-style bearing surface. Hex washer EPDM head screws include a bonded EPDM washer to help seal the fastener location.
What is the difference between TEK 2, TEK 3, and TEK 5 screws?
TEK 2 screws are commonly used for lighter-gauge material, TEK 3 screws are used for thicker compatible material, and TEK 5 screws are used for heavier drilling applications. The correct choice depends on material thickness and application.
Are EPDM washer self drilling screws good for roofing?
Yes. Hex washer EPDM self drilling screws are commonly used for roofing and siding applications because the bonded washer helps seal around the fastener head when installed correctly.