Our Heavy-duty 6.3mm Hex Self-Drilling Screws are the ideal choice for tough roofing and steel structure projects, especially in high-wind coastal areas and for thick metal sheets.

Made of high-quality SWRCH1022A steel (cold heading + carburizing quenching) and with a 6.3mm large diameter, these screws offer strong load-bearing capacity and gripping force, fully worthy of the "Heavy-duty" label.

They feature one-step drilling (no pre-drilling needed), saving time and labor. With premium anti-rust coating and 1500-hour corrosion resistance, they resist harsh weather, strong winds and coastal salt spray, ensuring long-term stability.

Widely used for industrial factories, steel workshops, warehouse roofs and solar bracket installation. We provide factory direct wholesale, in-stock sizes and customized services.

Choose our 6.3mm heavy-duty self-drilling screws for reliable, cost-effective fastening solutions for your projects.