Hex Head Self-Drilling Screw With Bonded Washer

1. Applicable fields and product positioning

This product is a special fastening accessory for open-air roofing projects. It is widely used in open-air projects such as color steel tile factory buildings, photovoltaic roofs, wall enclosures, steel structure awnings, and outdoor curtain walls. It is exported in batches to overseas building materials markets such as the Middle East, Southeast Asia, and Africa all year round. The core solution is to solve the problem of water seepage in roof screw holes. It is the main model of waterproof drill-tail fasteners. It is suitable for the assembly and fixation of single-layer color steel sheets, rock wool sandwich panels, and multi-layer insulation boards. There is no need to drill holes in advance during construction, greatly reducing labor hours.

2. Material Selection and Production Process

The raw material is high-quality carbon steel, and the entire screw has undergone quenching heat treatment. The hardness of the tip of the drill point reaches the standard, the cutting is sharp, and it is resistant to chipping or break at the drill point. Production process: eleven processes of rough drawing of raw materials, annealing, phosphating, fine drawing, cold heading, point forming, thread rolling, heat treatment, zinc plating, washer assembly, and packaging. The thread profile is regular and even, and the screwed-in steel sheet engages tightly and does not slip. The rubber gasket and steel gasket are pre-pressed and compounded by a machine, and are pre-installed on the flange face at the factory. After installation and compression, the gasket will not fall off or become misaligned, and the sealing performance is stable.

3. Product core advantages

Self-drilling integration: The cutting-edge special drilling structure can complete the three processes of drilling, tapping and locking in a single operation. It is suitable for various zinc plated steel sheets and color steel profiles with a thickness of 2~6mm; the short version is suitable for single-layer thin panels, and the long version is suitable for sandwich insulation boards.

Long-term waterproof sealing: EPDM rubber is resistant to high and low temperatures, aging, and ultraviolet exposure. It will not crack or shrink when used in the open air for many years. After tightening, the gap in the screw opening is completely sealed, eliminating the hidden danger of rainwater leakage from the source.

4. Quality control and supporting services

All specifications are in stock, regular orders are dispatched within 48 hours, and small-batch samples and full-container export orders can be accepted. The drill point hardness, thread accuracy, and adhesiveness of the rubber pad are randomly inspected batch by batch before leaving the factory, and defective products are eliminated. It can be used with our factory's supporting waterproof plugs and sealing auxiliary materials for one-stop packaging. It supports customized special tooth shapes and nonstandard lengthened self-drilling screws. Stable production capacity ensures long-term order renewals for overseas customers.