Dacromet Hex Head Self-Drilling Screw

1. Applicable fields and product standards

This product is produced in accordance with Chinese national standard drill point screw specifications. It has a hex flange + integrated waterproof rubber pad structure. It is mainly used for fastening roofs in outdoor highly corrosive environments. It is widely used in steel structure factories, photovoltaic power station roofs, coastal color steel projects, outdoor fences, and anti-corrosion curtain wall installations. It is exported to the Middle East, Southeast Asia, and coastal overseas building materials markets in batches all year round. Dacromet anti-corrosion is suitable for seaside saline-alkali, humid and rainy working conditions, and the extended shaft is suitable for sandwich insulation panels and multi-layer color steel sheet superposition assembly. It eliminates the need for pre-drilling and greatly shortens the outdoor construction period.

2. Raw materials and production processes

The raw material is high-quality carbon steel, and the overall quenching heat treatment is used. The hardness of the drill point cutting edge reaches the standard, and the drilling of thick steel sheets is resistant to chipping or break at the drill point. Production process: Production process: rough drawing of raw materials, annealing, phosphating, fine drawing, cold heading, point forming, thread rolling, heat treatment processing, Dacromet anti-corrosion coating, washer assembly, packaging, eleven processes, segmented tooth design, self-drilling in the front section, smooth locking in the rear section, long rod fastening force is uniform and not easy to bend the rod; Dacromet coating has strong adhesion, no hydrogen embrittlement hazard, salt spray resistance far exceeds conventional zinc plated products.

3. Product core advantages

Dacromet's long-term anti-corrosion: The coating is dense and resistant to acid, alkali and salt spray. It can provide long-term anti-rust in seaside, chemical plant areas and rainy open-air environments, eliminating the hidden danger of screw rust and water leakage.

Integrated waterproof seal: EPDM rubber bonded washer ring is resistant to ultraviolet rays and aging, and will not crack when exposed to the sun for a long time. After tightening, the screw holes are tightly sealed to prevent roof water seepage from the source.

Extended segmented thread structure: The extended shaft is suitable for multi-layer boards such as rock wool and polyurethane sandwich panels. The segmented teeth avoid locking and jacking up colored steel, and are suitable for multi-thickness insulation roof construction.

4. Quality control warehousing and supporting services

All series of extended specifications are in stock, regular orders are dispatched within 48 hours, and full-container foreign trade and large-volume orders for engineering projects can be accepted. The drill point hardness, Dacromet coating thickness, rubber pad bonding strength, and thread accuracy are inspected item by item before leaving the factory, and defective products with coating peeling off and damaged drill tips are eliminated. It can be supplied in complete sets with the factory's short hexagonal drill point and countersunk head drill point, and a one-stop roof fastening kit; it supports customized special lengthened, nonstandard pitch self-drilling screws, and stable production capacity ensures long-term supply for large-scale infrastructure projects.