color painted hex head roofing screw trapezoidal sheet screw with metal EPDM washer reduced drilling point

Color-Painted Hex Head Roofing Screw with Metal/EPDM Washer

This color-painted hex head roofing screw is a high-performance fastener engineered for securing trapezoidal metal sheets and other profiled cladding materials. It combines robust construction with intelligent design to deliver superior holding power, weather resistance, and installation efficiency.

Product Features & Benefits:

Hex Washer Head: The large hexagonal head provides a positive grip, allowing for high-torque driving with a standard wrench or socket. This ensures a tight, secure fit without the risk of cam-out.

Metal and EPDM Washer Combination: The integrated washer features a metal base plate that distributes the load evenly and prevents over-embedding into the sheet. Bonded to it is a soft EPDM sealing gasket that compresses to form a permanent, watertight, and dust-proof seal, protecting the structure from leaks and corrosion.

Reduced Drilling Point (Tapping Tip): The specially designed sharp and aggressive point acts like a self-drilling tip. It significantly reduces the effort required to start the screw and pierce the metal, leading to faster installation and less operator fatigue.

Color-Coated Finish: The screw shaft is finished with a durable color coating (typically matching standard roof sheet colors like white, red, gray, or green). This not only provides an aesthetically pleasing appearance but also adds an extra layer of corrosion resistance.

Comprehensive Sizing: Available in a wide range of diameters and lengths (e.g., 4.8mm and 5.5mm diameters in lengths from 19mm to 75mm) to accommodate various material thicknesses and insulation layers.

Typical Application Scenarios:

These screws are the go-to choice for a variety of architectural and industrial projects:

Industrial & Commercial Buildings: Securing trapezoidal metal roof and wall sheets on factories, warehouses, and shopping malls.

Agricultural Buildings: Installation on farm sheds, barns, and storage facilities.

Residential Construction: Used for metal roofs, carports, and garden sheds.

Retrofit and Insulation Projects: Ideal for attaching new cladding over existing roofs or for fixing through thick insulation panels, thanks to the available long lengths.

Solar Panel Mounting: Commonly used to secure mounting rails for solar panel systems onto metal roof structures.

Production Workflow Overview:

The manufacturing of these screws involves a precise and multi-stage process:

Wire Drawing & Heading: High-quality steel wire is first drawn to the required diameter. It is then fed into a cold-forming machine where the screw head (hex washer head) is forged under high pressure.

Thread Rolling: The blank screw shank is then rolled between two dies to form the precise, sharp threads. This cold-working process creates stronger threads compared to cutting.

Point Milling: The reduced drilling point is precisely machined onto the tip of the screw.

Heat Treatment: The screws undergo heat treatment (hardening and tempering) to achieve the necessary strength and hardness, ensuring they can drill through metal without breaking.

Surface Cleaning & Preparation: The screws are cleaned and phosphate-coated to provide an excellent base for the paint, enhancing adhesion and corrosion protection.

Color Painting: The screws are painted with a powder coat. The electrostatic charge ensures an even, consistent coating over the entire surface.

Curing: The painted screws are passed through an oven where the powder coating melts and cures, forming a tough, durable, and colorful finish.

Washer Assembly & Packaging: Finally, the combined metal/EPDM washer is pressed onto the screw shaft under the head. The finished products are then counted and packaged for shipment.

This meticulous production process ensures that every screw delivers reliable performance, long-term durability, and ease of installation for professional roofing and cladding applications.