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  • CSK Six Lobe And Rib Self Drilling Screw
  • CSK Six Lobe And Rib Self Drilling Screw
  • CSK Six Lobe And Rib Self Drilling Screw
  • CSK Six Lobe And Rib Self Drilling Screw

CSK Six Lobe And Rib Self Drilling Screw

The CSK Six Lobe And Rib Self Drilling Screw is a fastener featuring a specific combination of head, drive, and point geometry. The countersunk (CSK) head is designed to sit flush with the surface of the material upon installation. The dual-drive head incorporates both a six-lobe (Torx) and a rib (slotted) drive, accommodating two types of tools for application flexibility. The self-drilling point allows the screw to drill its own pilot hole and form mating threads during installation, eliminating the need for a separate drilling step. The specification is ST3.5-20*40, where 3.5mm is the nominal thread diameter, 20mm is the thread length, and 40mm is the total length. It is manufactured from SUS410 stainless steel, a material known for its strength and corrosion resistance. The product has a Brightening surface treatment, resulting in a clean, metallic finish.

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  • Product Features

  • Specification: ST3.5-20*40

    Material: SUS410

    Surface Treatment: Brightening

    Product Introduction

    The CSK Six Lobe And Rib Self-Drilling Screw is designed for metal fastening applications requiring flush surface finish with enhanced drive engagement and vibration resistance. The countersunk head configuration allows the screw to sit level with or below the workpiece surface, providing a smooth appearance and eliminating protrusions. The six-lobe drive enables positive torque transmission with reduced cam-out risk during installation, providing reliable engagement with standard six-lobe tools. The rib feature beneath the head provides enhanced locking capability that resists loosening from vibration and dynamic loads. The self-drilling point drills and taps threads simultaneously, eliminating pilot hole requirements and reducing assembly time. Manufactured from SUS410 stainless steel with brightening surface treatment, this screw provides hardness for metal fastening with an aesthetic bright finish. The ST3.5-20 thread specification with 40mm length offers engagement for sheet metal and light structural assemblies.

    Core Advantages

    01
    Countersunk Head Design
    Flush mounting capability provides smooth surface finish and eliminates protrusions for applications requiring a level surface.
    02
    Six-Lobe Drive
    Positive torque transmission with reduced cam-out risk during installation for reliable drive engagement.
    03
    Underhead Rib Feature
    Enhanced locking capability resists loosening from vibration and dynamic loads for secure connections.
    04
    Self-Drilling Point
    Drills and taps threads in a single operation, eliminating pilot hole requirements and reducing installation time.
    05
    SUS410 Stainless Steel
    Provides hardness for metal fastening applications with corrosion resistance for demanding environments.
    06
    Brightening Treatment
    Aesthetic bright finish with enhanced surface smoothness and improved corrosion resistance.

    Product Features

    Countersunk head configuration Flush mounting provides smooth surface finish for applications requiring a level surface without protrusions when used with corresponding countersink.
    Six-lobe drive Positive torque transmission with reduced cam-out risk during installation, compatible with standard six-lobe tools for reliable engagement.
    Underhead rib design Rib feature provides enhanced locking capability that resists loosening from vibration and dynamic loads in structural applications.
    Self-drilling point Drills and taps threads simultaneously, eliminating pilot hole drilling and reducing installation steps.
    SUS410 stainless steel material Provides hardness for metal fastening applications with corrosion resistance for demanding environments.
    Brightening surface treatment Aesthetic bright finish with enhanced surface smoothness and improved corrosion resistance.
    ST3.5-20 thread specification Standardized thread configuration provides consistent performance for sheet metal and light structural assemblies.
    40mm length Provides engagement for multiple material layers and sheet metal assemblies.

    Application Scenarios

    Sheet metal assemblies
    Equipment enclosures
    Electronics chassis
    Furniture construction
    Automotive components
    Vibration-prone applications
    Industrial machinery
    Architectural metalwork

    This CSK six-lobe and rib self-drilling screw is deployed in sheet metal and light structural applications requiring flush mounting with enhanced vibration resistance. Applications include sheet metal assemblies where smooth surfaces are essential, equipment enclosures, electronics chassis, furniture construction, automotive components where vibration resistance is critical, industrial machinery, and architectural metalwork where the countersunk head provides flush mounting, the rib feature offers locking capability, and the brightening finish provides an aesthetic appearance.

    Common Questions and Solutions

    What is the function of the underhead rib feature?
    The rib feature beneath the screw head provides enhanced locking capability by creating additional friction between the head and the workpiece surface. This design resists loosening from vibration and dynamic loads, making it suitable for applications subject to movement or cyclic loading.
    What is the six-lobe drive and what are its benefits?
    The six-lobe drive provides positive torque transmission with reduced cam-out risk compared to Phillips or other cross drive types. The design allows for higher torque transfer during installation and reduces the risk of drive stripping for reliable and consistent fastening.
    What is the recommended countersink angle for this screw?
    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.
    What material thickness can the ST3.5-20*40 screw accommodate?
    The ST3.5-20 specification with 40mm length provides engagement for sheet metal and light structural assemblies. The actual maximum material thickness depends on the drill point length and substrate hardness. Consult the technical datasheet for specific thickness recommendations.
    What is the brightening surface treatment?
    Brightening is a surface treatment process that enhances the natural finish of the stainless steel material. It provides a bright, aesthetic appearance while improving surface smoothness and corrosion resistance through removal of surface contaminants and oxidation.
    What is the recommended installation speed for this screw?
    Install at controlled speeds to avoid overheating the drill point. Excessive speed may reduce drill point life and cause thread stripping. Use torque-controlled drivers to prevent over-tightening when the countersunk head seats flush with the workpiece surface.

    Installation Considerations

    1
    Select the correct six-lobe driver size that matches the screw head recess to ensure positive engagement and prevent drive wear during installation.
    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 based on material hardness; excessive speed may reduce drill point life and cause thermal damage to the brightening finish.
    5
    Ensure perpendicular alignment between screw axis and workpiece surface to prevent drill point deflection and ensure clean hole formation.
    6
    The brightening treatment provides aesthetic and corrosion protection. Handle screws with clean gloves to maintain surface appearance and prevent contamination.

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Jiaxing Zhongke Metal Technology Co.,Ltd.
Jiaxing Zhongke Metal Technology Co.,Ltd. is located in Xinfeng Town Industrial Park, Nanhu District, Jiaxing City, Zhejiang Province. It is a manufacturer integrating the development, design and manufacturing of heat treatment equipment. At the same time, due to the advantages in the heat treatment industry, it also takes into account the development of general parts, automotive parts, and stainless steel high-strength fasteners. Design, development, and manufacturing, and open to the outside world for heat treatment process design and processing of various metal materials. As China Wholesale CSK Six Lobe And Rib Self Drilling Screw Suppliers, Exporter and CSK Six Lobe And Rib Self Drilling Screw Factory. The company has strong financial and technical strength, complete production equipment, scientific testing methods, and a perfect management team. "Quality-oriented, technological innovation" is our purpose, and adhering to the concept of "service first, honesty and trustworthiness", to provide customers with diversified and reliable products.
  • 2001

    Founded in

  • 17 acres+

    Covered area

  • 100+

    Manufacturing equipment

  • 200+

    Number of employees

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