yellow zinc hex head self tapping screw with big flange single EPDM sealing waher T-17 cutting point for wood to metal

Product Overview

Our sharp-point metal-to-wood self-tapping screws are engineered for securing roofing sheets to wooden substructures. Longer versions are designed for crest fixing, while shorter versions are optimized for valley fixing. With enhanced design and surface treatment options, these screws significantly improve installation efficiency, corrosion resistance, and service life, making them suitable for roofing projects in diverse climatic conditions.

Key Features & Advantages

Dual-Design for Crest & Valley Fixing

Long Screws (Crest Fixing): Specifically designed for roof crests to avoid water pooling risks associated with valley fixing. Water flows downward by gravity, and valley fixation may lead to accumulation around screws, potentially causing rust over time.

Short Screws (Valley Fixing): Feature a reduced drilling point for faster penetration through thin metal sheets and enhanced swarf clearance, ideal for efficient valley installations.

Advanced Surface Treatment Options

Blue-White Zinc Plating: Provides basic rust protection for low-corrosion environments (e.g., inland dry climates), with salt spray resistance up to 72 hours.

Yellow Zinc Plating: Offers moderate corrosion resistance with an aesthetically pleasing finish, suitable for general outdoor applications (e.g., urban and suburban areas), with salt spray resistance up to 72 hours.

Ruspert Coating: A high-performance zinc-aluminum coating delivering exceptional corrosion resistance for harsh environments (e.g., coastal/industrial areas), with salt spray resistance exceeding 500 hours/1000hours/1500hours, far surpassing conventional zinc plating.

Optimized Thread & Swarf Clearance Design

Larger-Diameter Upper Threads: Ensure superior pull-out strength, enhancing structural stability under high-wind conditions.

Slotted Scrat shank Design: Efficiently clears excess swarf during installation, preventing damage to EPDM washers and potential leaks.

Self-Tapping Functionality & Compatibility

Sharp-Point Design: Eliminates pre-drilling, enabling direct penetration into metal sheets and wood, reducing labor time and costs.

Versatile Applications: Ideal for securing metal roofing sheets, fiber cement boards, and other lightweight building materials to wooden substrates.

Technical Specifications

Why Choose These Screws?

Superior Corrosion Resistance: Multiple surface treatment options cater to diverse environments, with Ruspert coating excelling in high-corrosion regions.

Installation Efficiency: Self-tapping design and clearance features significantly reduce installation time and labor costs.

Reliability: Larger upper threads and slotted shank design ensure robust fixation and leak prevention.

Versatility: Long and short screws address crest and valley fixing needs, adapting to various roofing structures.

Applications

Roof Crest Fixing: Use long screws to prevent water pooling.

Roof Valley Fixing: Use short screws for efficient installation and clearance.

General Fixing: Suitable for securing metal sheets, fiber cement boards, and other materials to wooden substructures.

Ordering Information

Surface Treatment Selection: Choose blue-white zinc, yellow zinc, or Ruspert coating based on your environmental needs.

Custom Sizing: Available in various lengths and diameters to meet project requirements.

Packaging Options: Bulk, boxed, or customized packaging supported.

For inquiries or detailed product specifications, contact us today!