Hex Head Self Drilling Screws with EPDM Washer China Factory Suppliers

High-strength hex head self drilling screws with EPDM bonded washers from a leading China factory. Sizes: M4.8L19-125mm, M5.5L19-135mm, M6.3L19-125mm. Trusted China suppliers for leak-proof industrial fastening.

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Details

Detailed Parameters

Drill Point Capability	Up to 1/2" Thick Steel	Diameter Range	#6 through 5/16"-18
Head Style	Hexagonal Head	Washer Type	EPDM Bonded Washer
Technology Base	German Engineering Technology	Material Source	Premium Domestic Steel Mills
Surface Treatment	Advanced Anti-Corrosion Coating	Design Feature	High-Penetration Dovetail Design
Primary Application	Steel Structure Color Tiles	Compatibility	Metal-to-Metal, Wood, Aluminum

Key Advantages

High Strength

Utilizing raw materials from top-tier steel companies to meet stringent high-strength bolt requirements.

Rapid Installation

The specialized drill point eliminates pre-drilling, ensuring faster and more economical construction.

German Technology

Adopting advanced German design principles for superior anchoring force and operational ease.

Superior Penetration

The dovetail design optimizes attack speed and penetration efficiency during heavy-duty installation.

Extreme Corrosion Resistance

Advanced surface treatment provides weather resistance several times higher than ordinary products.

Multi-Surface Use

Perfect for fixing color steel tiles, thin plates, and connecting metal to wood or aluminum.

Product Gallery

Management Platforms

Quality Control

Strict raw material screening and rigorous testing for high-strength standards.

Precision Manufacturing

State-of-the-art German technology ensures consistent dimensions and thread accuracy.

Logistics Management

Efficient supply chain management to ensure timely delivery for global projects.

Surface Processing

Advanced coating lines dedicated to enhancing anti-corrosion and longevity.

Inventory Systems

Optimized warehousing for various head styles and thread lengths for immediate dispatch.

R&D Innovation

Continuous improvement of drill flute lengths and penetration speeds.

Investment Return Comparison

Performance Metric	Ordinary Self-Drilling Screws	Gongbing High-End Series
Installation Speed	Slow (Pre-drilling often needed)	Ultra-Fast (Direct Penetration)
Corrosion Lifespan	Standard (1-3 years)	Extended (5-10+ years)
Labor Cost	High (Two-step process)	Low (Single-step process)
Sealing Integrity	Moderate Risk of Leakage	Superior (EPDM Bonded Seal)
Material Strength	Generic Grade Steel	Certified High-Strength Steel

Frequently Asked Questions

Q: What is the maximum steel thickness these self-drilling screws can penetrate?

Our high-quality self-drilling screws are engineered to penetrate steel base materials up to 1/2" thick without the need for pre-drilling.

Q: Why is an EPDM bonded washer important for fasteners?

EPDM bonded washers provide a watertight seal, preventing leaks in roofing and steel structures while resisting UV degradation and extreme weather.

Q: Which materials are compatible with these fasteners?

They are ideal for metal-to-metal connections, light steel keels, wooden keels, aluminum profiles, and fixing color steel tiles.

Q: How does German technology improve the screw performance?

German engineering optimizes the drill point geometry and thread design, resulting in higher anchoring force and faster penetration speeds.

Q: What makes your surface treatment superior to standard screws?

We use advanced surface coating technology that significantly increases anti-corrosion and weather resistance compared to standard zinc plating.

Q: Are these screws suitable for high-strength industrial structures?

Yes, we source raw materials from large domestic steel companies to ensure our products meet the stringent requirements of high-strength industrial bolts.