Standard: DIN7981, ISO15481 , ASME/ANSI B18.6.4
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
Flat Tail Self-Tapping Screws are designed for metal-to-metal fastening applications requiring secure thread engagement in pre-drilled holes with a flush finish. The flat tail design provides a blunt tip that is suitable for applications where the screw must bottom out or where a sharp point may cause damage to underlying components. These screws cut mating threads in pre-drilled holes, providing secure engagement without requiring a separate tapping operation. Available in carbon steel (C1022A) and stainless steel (SUS410, SUS304, SUS316) material options, the screws comply with DIN7981, ISO15481, and ASME/ANSI B18.6.4 standards. Multiple surface treatments provide corrosion resistance options for various environmental conditions, including passivated, galvanized, nickel-plated, blackened, and Dacromet finishes. Metric sizes from ST3.5 to ST6.3 and imperial sizes from 6# to 1/4" accommodate diverse application requirements.
Core Advantages
01
Flat Tail Design
Blunt tip suitable for applications requiring bottoming out or where sharp points may damage underlying components.
02
Self-Tapping Thread
Cuts mating threads in pre-drilled holes, providing secure engagement without requiring a separate tapping operation.
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 DIN7981, ISO15481, and ASME/ANSI B18.6.4 specifications for quality assurance.
Product Features
Flat tail design Blunt tip configuration suitable for applications where the screw must bottom out or where sharp points may cause damage to underlying components.
Self-tapping thread Cuts mating threads in pre-drilled holes, providing secure engagement without requiring a separate tapping operation.
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
Blind hole applications
Bottoming applications
Sheet metal assemblies
Equipment enclosures
Electronics chassis
Automotive components
Industrial machinery
HVAC systems
These flat tail self-tapping screws are deployed in metal fastening applications requiring secure thread engagement with a blunt tip configuration. Applications include blind hole applications where the screw must bottom out, bottoming applications where sharp points may damage underlying components, sheet metal assemblies, equipment enclosures, electronics chassis, automotive components, industrial machinery, and HVAC systems where the flat tail provides safe seating and the self-tapping thread provides secure engagement without separate tapping operations.
Common Questions and Solutions
What is the flat tail design and when should it be used?
The flat tail features a blunt tip rather than a sharp point. This design is suitable for applications where the screw must bottom out in a blind hole, where a sharp point may protrude and cause damage, or where the fastener must seat against a flat surface without piercing through.
How do I select the correct pilot hole size for these screws?
Pilot hole size varies based on screw diameter and material hardness. Refer to the technical datasheet for recommended pilot hole diameters for each specification to ensure proper thread engagement and prevent material damage or thread stripping.
What is the difference between flat tail and sharp point self-tapping screws?
Flat tail screws have a blunt tip for bottoming and blind hole applications. Sharp point screws have a pointed tip for easier alignment and start in through-hole applications. Select based on whether the hole is blind or through, and whether bottoming contact is required.
What surface treatment provides the best corrosion protection?
Dacromet coating provides the highest salt spray resistance. For stainless steel fasteners, passivation enhances the natural oxide layer for improved corrosion resistance. Hot rust offers protection for outdoor applications.
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 flat tail self-tapping screws?
Installation torque varies by screw diameter, material, and application. Use torque-controlled drivers to prevent over-tightening, particularly in blind hole applications where bottoming out occurs. Consult the technical datasheet for recommended torque values.
Installation Considerations
1
Drill pilot holes to the recommended diameter for the specific screw size and material thickness to ensure proper thread engagement.
2
The flat tail design is suitable for blind hole applications. Ensure hole depth accommodates the screw length with adequate bottom clearance.
3
Use the correct driver type and size that matches the screw head drive configuration to prevent driver slippage and damage during installation.
4
Use torque-controlled installation tools to prevent over-tightening, particularly when the screw is approaching bottom contact in blind holes.
5
Apply appropriate spindle speed to prevent thread galling; excessive speed may cause thread damage or thermal buildup.
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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