Standard: DIN7504K, ISO15480, 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
Hexagonal Self-Drilling Screws are designed for metal-to-metal fastening applications requiring high torque transmission and secure clamping. The hexagonal head configuration enables positive engagement with standard hex socket tools, providing reliable torque transfer for installation. These screws incorporate a self-drilling point that drills and taps threads simultaneously, eliminating the need for pilot hole preparation. Available in carbon steel (C1022A) and stainless steel (SUS410, SUS304, SUS316) material options, the screws comply with DIN7504K, ISO15480, and ASME/ANSI B18.6.3 standards. Multiple surface treatments provide corrosion resistance for various environmental conditions, including galvanized, passivated, nickel-plated, blackened, and Dacromet finishes.
Core Advantages
01
Hexagonal Head Design
Enables positive engagement with standard hex socket tools for high torque transmission and secure fastening.
02
Self-Drilling Point
Drills and taps threads in a single operation, eliminating pilot hole requirements and reducing installation time.
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 DIN7504K, ISO15480, and ASME/ANSI B18.6.3 specifications for quality assurance.
Product Features
Hexagonal head configuration Positive engagement with standard hex socket tools provides reliable torque transmission for controlled installation and removal.
Self-drilling point design Drill point penetrates and threads metal substrates without pre-drilling, compatible with metal-to-metal fastening applications.
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
Structural steel connections
Heavy equipment assembly
Roofing and siding
Metal building construction
HVAC systems
Industrial machinery
Automotive components
Bridge and infrastructure
These hexagonal self-drilling screws are deployed in heavy-duty metal fastening applications requiring high torque transmission and secure clamping. Applications include structural steel connections, heavy equipment assembly, roofing and siding systems where weather-resistant fasteners are required, metal building construction, HVAC systems, industrial machinery, automotive components, and infrastructure projects where the hexagonal head design provides positive engagement with standard tools for reliable installation.
Common Questions and Solutions
What are the advantages of the hexagonal head design for self-drilling screws?
The hexagonal head enables positive engagement with standard hex socket tools, providing reliable torque transmission for controlled installation. This design reduces the risk of cam-out compared to cross drive types and allows for higher torque application in structural fastening applications.
How do I select the correct socket size for installation?
Select a socket that fits the hex head precisely. Using the correct socket size prevents rounding of the hex corners and ensures positive engagement for torque transfer. Refer to the product specification for the exact hex size for each screw diameter.
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 torque for hex head self-drilling screws?
Installation torque varies by screw diameter, material, and substrate hardness. Use torque-controlled drivers to prevent over-tightening. Consult the technical datasheet for recommended torque values based on screw size and application material thickness.
Installation Considerations
1
Select drill point length appropriate for material thickness to ensure proper thread engagement and secure fastening.
2
Use the correct hex socket size for the screw head to prevent rounding and ensure positive torque transmission during installation.
3
Use torque-controlled installation tools to prevent over-driving. The hex head should seat against the workpiece surface without damaging the head or surrounding material.
4
Apply appropriate spindle speed based on screw diameter and material hardness; excessive speed may reduce drill point life and cause thermal damage to coatings.
5
Ensure perpendicular alignment between screw axis and workpiece surface to prevent drill point deflection and ensure clean hole formation.
6
For outdoor applications requiring extended corrosion resistance, specify Dacromet, hot-dip galvanized, or stainless steel materials based on environmental exposure conditions.
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