Ingco ST6.3 x 25mm Hex Head Self-Drilling Roofing Screw with EPDM Rubber Washer - 50-Piece High-Strength Zinc-Plated Fastener Pack (HWSS6302521)

Securing heavy corrugated metal roofs, steel trusses, or industrial siding panels using standard screws or low-grade fasteners leaves your structure vulnerable to shifting, high-wind displacement, and catastrophic water leaks. Standard screws require tedious pre-drilling, while low-grade rubber seals degrade rapidly under harsh UV rays and thermal shifting, cracking over time and letting moisture seep directly onto structural steel. The Ingco HWSS6302521 ST6.3 x 25mm Hex Self-Drilling Roofing Screw Set is an industrial-strength fastening solution engineered to deliver instantaneous, high-torque sheet metal joinery and 100% weather-tight sealing. Featuring an advanced integrated drilling tip, this premium hardware pack enables metal building contractors, roofing specialists, and assembly crews to pierce thick steel structures effortlessly without pre-drilling.

The exceptional structural integrity and leak-proof performance of these self-drilling fasteners stem from their hardened carbon steel core and premium EPDM rubber washer interface. Each screw is treated with an advanced anti-corrosion zinc-plated protective layer, shielding the raw steel from oxidation, atmospheric humidity, and acidic rain. The integrated hexagon flange head ensures perfect socket engagement under high torque, spreading clamp pressure evenly across the metal sheet. When driven home, the high-elasticity rubber washer compresses perfectly against the substrate, forming an airtight, watertight bond that stops rain leaks and absorbs heavy structural vibrations. Packed neatly inside a convenient, reusable transparent plastic bottle container, this 50-piece pack keeps your hardware clean, organized, and dry on busy construction sites.

Key Features

• Advanced Self-Drilling Point – Engineered with a sharp, integrated drill bit point that punches cleanly and taps threads directly through metal sheets without requiring separate pilot holes.

• Premium EPDM Rubber Washer – High-elasticity rubber backing compresses uniformly to seal out rainwater and moisture, fully protecting against structural leaks.

• Corrosion-Resistant Zinc Finish – Rugged zinc-plated layer forms an impenetrable barrier against rust, expanding the operational life of outdoor metal roof installations.

• High-Torque Hexagon Flange Head – Flat flange profile maximizes driver socket surface contact area, preventing cam-out and head stripping under high physical torque.

• Heavy-Duty Carbon Steel Core – Induction-tempered steel frame provides elite shear strength, easily handling heavy winds and shifting structural loads.

• 50-Piece Transparent Bottle Pack – Securely bundled inside a durable plastic storage bottle layout for effortless stock tracking, organization, and moisture barrier protection.

Technical Specifications

• Brand: INGCO

• Model: HWSS6302521

• Product Type: Hex Washer Head Metal-to-Metal Self-Drilling Roofing Screws

• Size Specification (Metric): ST6.3 × 25 mm

• Gauge Dimension Equivalent: 14G Heavy-Duty Fastener Profile

• Screw Length Profile: 25 mm (1 Inch Continuous Shaft Coverage)

• Head Geometry Type: Hexagon Flange Driving Head

• Tip Configuration: Precision Metal Drilling Point Matrix

• Total Pack Quantity: 50 Pieces Included per Container

• Material Composition Matrix: High-Performance Hardened Carbon Steel Core

• Surface Coating Protection: Industrial-Grade Zinc Plating Finish

• Washer Material Interface: Weather-Resistant, Compressive Rubber Seal Backing

• Primary Target Substrates: Corrugated metal roofing sheets, iron profiles, heavy-gauge steel trusses, siding panels, and structural metal framework

• Primary Applications: Industrial warehouse roof installation, steel frame garage assembly, commercial car port construction, and general heavy-duty sheet metal fastening

Ideal For

Roofing contractors, structural steel fabricators, commercial building crews, HVAC installers, and domestic DIYers who need an ultra-sharp, rustless hex self-drilling screw pack with rubber washers to assemble completely leak-proof metal structures.

Package Includes

50 × INGCO HWSS6302521 ST6.3x25mm Hex Self-Drilling Screws

1 × Heavy-Duty Reusable Clear Plastic Bottle Storage Layout with Screw-Top Lid