A
Anonymous
Mar 26, 2026
Rating: 5/5
Strong
Holds metal firmly to wood. The washer compresses nicely without cracking.
Description
These are galvanized self-drilling tapping screws featuring an external hex head and an integrated flange, engineered for fastening color steel roofing panels. The drill point tip eliminates the need for pre-drilling by penetrating metal sheets directly, while the built-in flange acts as a washer to distribute clamping force and seal the hole against moisture. Constructed with a corrosion-resistant galvanized coating, these fasteners are suitable for exterior construction applications where durability is required. The cap head design provides a finished appearance and protects the drive recess from debris accumulation during installation. Ensure the screw length is appropriate for the total thickness of the materials being joined to achieve a secure hold without over-penetration.
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | Carbon Steel |
| Finish | Zinc Galvanized |
| Head Style | Hex Washer Head |
| Drive Size | 5/16 Inch |
| Thread Size | #12 - 14 TPI |
| Length | 1 Inch |
| Washer Material | EPDM Rubber |
| Point Type | Self-Drilling #3 |
| Application | Metal Roofing |
| Pack Size | 100 Pieces |
5 reviews
A
Anonymous
Mar 26, 2026
Rating: 5/5
No leaks
Watertight seal is excellent. Used them on my shed roof and haven't seen any water intrusion.
A
Anonymous
Mar 25, 2026
Rating: 4/5
Good value
One stripped due to my drill torque but the rest were fine. Good quality for the price.
A
Anonymous
Mar 01, 2026
Rating: 5/5
Works great
Easy to install on metal sheets. No pre-drilling required which saved me a lot of time.
A
Anonymous
Feb 16, 2026
Rating: 5/5
Fastener pro
Use these for all my projects. Reliable supply and consistent quality in every box.
5 FAQ
Q: Do I need to pre-drill holes?
A: No, the self-drilling design eliminates the need for pre-drilling.
Q: What socket size fits the head?
A: A 5/16 inch hex socket is required for installation.
Q: Are these rust proof?
A: They are zinc galvanized for corrosion resistance suitable for outdoor use.
Q: Can I use these on steel frames?
A: Yes, the #3 point penetrates light gauge steel effectively.
Q: Are these suitable for outdoor use?
A: Yes, they are designed specifically for exterior roofing applications.
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