Standard: DIN7504N, ISO15481, ASME/ANSI B18.6.3
Material: C1022A, SUS410,SUS304,SUS316
Specification: ST3.5, ST3.9, ST4.2, ST4.8, ST5.5, ST6.3, 6#, 7#, 8#, 10#, 12#, 14#, 1/4”
Surface Treatment: Passivated, Galvanized, Nickel-plated, Blackened, Head sprayed, Dacromet, Hot Rust, Rasputin
Product Introduction
Pan Head Self-Drilling Screws are fasteners designed for single-step fastening into metal substrates, eliminating the need for pilot hole drilling. The pan head configuration features a flat underside that provides accurate clamping force distribution when securing brackets, fittings, and metal components. These screws incorporate a self-drilling point that drills and taps threads simultaneously during installation, reducing assembly time and labor requirements. Available in carbon steel (C1022A) and stainless steel (SUS410, SUS304, SUS316) material options, the screws comply with DIN7504N, ISO15481, and ASME/ANSI B18.6.3 standards. Multiple surface treatments provide corrosion resistance options for various environmental conditions, including galvanized, passivated, nickel-plated, blackened, and Dacromet finishes.
Core Advantages
01
Self-Drilling Point
Drills and taps threads in a single operation, eliminating pilot hole requirements and reducing installation time.
02
Flat Underside Design
Pan head configuration provides accurate clamping force distribution when fastening brackets and fittings to metal surfaces.
03
Multiple Material Options
Available in carbon steel (C1022A) and stainless steel (SUS410, SUS304, SUS316) to meet diverse application requirements.
04
Wide Specification Range
Metric sizes from ST3.5 to ST6.3 and imperial sizes from 6# to 1/4" for comprehensive application coverage.
05
Extensive Surface Treatments
Passivated, galvanized, nickel-plated, blackened, Dacromet, and hot rust finishes for environmental adaptability.
06
Standard Compliance
Manufactured to DIN7504N, ISO15481, and ASME/ANSI B18.6.3 specifications for quality assurance.
Product Features
Self-drilling point design Drill point penetrates and threads metal substrates without pre-drilling, compatible with metal-to-metal fastening applications.
Pan head configuration Flat underside provides accurate clamping pressure for brackets, fittings, and structural connections in metal assembly.
Carbon steel material C1022A grade offers strength for general metal fastening applications with appropriate surface treatment.
Stainless steel material options SUS410 provides hardness, SUS304 offers general corrosion resistance, and SUS316 delivers marine-grade protection.
Metric specification range Available in ST3.5, ST3.9, ST4.2, ST4.8, ST5.5, and ST6.3 diameters for diverse thread size requirements.
Imperial specification range Available in 6#, 7#, 8#, 10#, 12#, 14#, and 1/4" sizes for North American standard applications.
Surface treatment options Galvanized and passivated finishes provide general corrosion protection; nickel-plated offers enhanced appearance; blackened delivers aesthetic matte finish; Dacromet provides high salt spray resistance.
Application Scenarios
Metal-to-metal fastening
Steel sheet joining
Roofing construction
Metal siding installations
Structural steel connections
HVAC duct assembly
Electrical enclosure mounting
Automotive component attachment
These self-drilling screws are deployed in metal-to-metal fastening applications where rapid assembly is required without pilot hole preparation. Applications include steel sheet joining in roofing and siding construction, attaching brackets and fittings to structural steel, HVAC duct assembly, electrical enclosure mounting, and automotive component attachment. The stainless steel variants are specified for marine environments, food processing equipment, and outdoor architectural applications requiring corrosion resistance.
Common Questions and Solutions
How do I select the correct drill point length for my material thickness?
Select drill point length based on total material thickness to be penetrated. Self-drilling screws require a drill point longer than the combined thickness of materials to ensure proper thread engagement in the base material.
What is the difference between carbon steel and stainless steel options?
Carbon steel (C1022A) provides high strength for general applications and is typically used with corrosion-resistant coatings. Stainless steel (SUS410) offers hardness for structural applications, SUS304 provides general corrosion resistance, and SUS316 delivers superior marine-grade protection for harsh environments.
What surface treatment provides the best corrosion protection?
Dacromet coating provides the highest salt spray resistance, with tests reaching up to 1000 hours. Hot-dip galvanizing offers corrosion resistance for outdoor structural applications. For stainless steel fasteners, passivation treatment enhances the natural oxide layer for improved corrosion resistance.
Can these screws be used with aluminum substrates?
Yes, but consider galvanic compatibility. Zinc-plated carbon steel screws can create galvanic corrosion with aluminum in certain environments. Specialized coatings or stainless steel options are recommended for long-term aluminum-to-metal applications.
What is the recommended installation speed and torque?
Install at controlled speeds to avoid overheating the drill point. Excessive speed reduces drill point life and may cause thread stripping. Use torque-controlled drivers to prevent over-tightening when the screw seats against the material surface.
What is the standard thread pitch for these screw sizes?
Standard thread pitch varies by diameter. ST3.5 and ST3.9 typically use 1.3mm pitch, ST4.2 uses 1.4mm, ST4.8 uses 1.6mm, and ST5.5 and ST6.3 use 1.8mm pitch.
Installation Considerations
1
Select drill point length appropriate for material thickness to ensure proper thread engagement in the base material.
2
Use torque-controlled installation tools to prevent over-driving and thread stripping when the screw head contacts the workpiece surface.
3
Apply appropriate spindle speed based on screw diameter and material hardness; excessive speed may reduce drill point life and cause thermal damage.
4
Ensure perpendicular alignment between screw axis and workpiece surface to prevent drill point deflection and ensure clean hole formation.
5
For outdoor applications requiring extended corrosion resistance, specify Dacromet, hot-dip galvanized, or stainless steel materials based on environmental exposure conditions.
6
When fastening dissimilar metals, consider galvanic compatibility and select appropriate coating or stainless steel material to prevent accelerated corrosion.
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