Specifications:

​Size: 5.5/6.3×25–300mm (Head/Shank×Length)
​Salt Spray Test: 500H/1000H/1500H (Class 3/Class 4 corrosion resistance)
​Performance Ranges:
▶ 380–440 N·m (Torque)
▶ 620–720 MPa (Tensile Strength)
Key Features:

Self-drilling design with serrated threads for grip enhancement.
Zinc-aluminum alloy coating for Class 3/4 anti-corrosion compliance.
High-carbon steel core (ISO 3506 Grade 8.8/10.9).
Applications:
Fastening metal roofing, HVAC systems, and structural steel assemblies.

Standards: ISO 1461, ASTM B633.