Standard: DIN7982, ISO 15482, 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
Countersunk Head Sharp Point Self-Tapping Screws are designed for metal fastening applications requiring flush surface finish with secure thread engagement in pre-drilled holes. The countersunk head configuration allows the screw to sit level with or below the workpiece surface, providing a smooth appearance and eliminating protrusions. The sharp point design enables precise alignment and entry into pilot holes, facilitating consistent thread formation during installation. 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 DIN7982, ISO15482, and ASME/ANSI B18.6.4 standards. Multiple surface treatments provide corrosion resistance options for various environmental conditions, including galvanized, passivated, nickel-plated, blackened, and Dacromet finishes.
Core Advantages
01
Countersunk Head Design
Flush mounting capability provides smooth surface finish and eliminates protrusions for applications requiring a level surface.
02
Sharp Point Design
Precise alignment and entry into pilot holes enables consistent thread formation during installation.
03
Self-Tapping Thread
Cuts mating threads in pre-drilled holes, providing secure engagement without requiring a separate tapping operation.
04
Multiple Material Options
Available in carbon steel (C1022A) and stainless steel (SUS410, SUS304, SUS316) to meet diverse application requirements.
05
Wide Specification Range
Metric sizes from ST3.5 to ST6.3 and imperial sizes from 6# to 1/4" for comprehensive application coverage.
06
Extensive Surface Treatments
Passivated, galvanized, nickel-plated, blackened, Dacromet, and hot rust finishes for environmental adaptability.
Product Features
Countersunk head configuration Flush mounting provides smooth surface finish for applications requiring a level surface without protrusions when used with corresponding countersink.
Sharp point design Precise alignment and entry into pilot holes enables consistent thread formation for secure fastening in metal substrates.
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
Sheet metal assemblies
Equipment enclosures
Electronics chassis
Furniture construction
Architectural metalwork
Instrumentation panels
Automotive components
Industrial equipment
These countersunk head sharp point self-tapping screws are deployed in metal fastening applications requiring flush surface finish with secure thread engagement in pre-drilled holes. Applications include sheet metal assemblies where smooth surfaces are essential, equipment enclosures, electronics chassis, furniture construction, architectural metalwork, instrumentation panels, automotive components, and industrial equipment where the countersunk head provides flush mounting and the sharp point enables precise alignment in pilot holes.
Common Questions and Solutions
What are the advantages of the countersunk head design?
The countersunk head allows the screw to sit flush with or below the workpiece surface when used with a corresponding countersunk hole, providing a smooth appearance and eliminating protrusions that could interfere with adjacent components, processes, or finishing operations.
What is the recommended countersink angle for these screws?
Countersunk screws typically use 82-degree or 90-degree angles. Select based on the mating countersink in the workpiece. Verify the head angle against the countersink tool specification to ensure proper seating and flush mounting.
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 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.
What is the recommended installation speed for countersunk self-tapping screws?
Install at controlled speeds to prevent thread galling and ensure proper thread formation. Use torque-controlled drivers to prevent over-tightening when the countersunk head seats flush with the workpiece surface.
Installation Considerations
1
Drill pilot holes to the recommended diameter for the specific screw size and material thickness to ensure proper thread engagement.
2
Ensure the countersink angle matches the screw head angle for proper seating and flush mounting without damage to surrounding material.
3
Use torque-controlled installation tools to prevent over-driving. The countersunk head should seat flush with the workpiece surface without sinking below or damaging surrounding material.
4
Apply appropriate spindle speed to prevent thread galling; excessive speed may cause thread damage or thermal buildup.
5
Ensure perpendicular alignment between screw axis and workpiece surface to prevent cross-threading and ensure proper engagement.
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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