Carbon steel Phillips countersunk self-drilling screw

Carbon steel Phillips countersunk self-drilling screw is designed for flush surface fastening while enabling direct drilling into steel substrates without pre-drilling. The countersunk head allows the screw to sit level with the material surface after installation, making it suitable for applications requiring a smooth finish and minimal protrusion. The integrated drill point combines drilling, tapping, and fastening into a single operation, improving installation efficiency in steel-to-steel or steel-to-aluminum assemblies. The Phillips drive ensures compatibility with standard electric screwdrivers and automated assembly systems, supporting consistent torque application in industrial production environments.

ZSD Screw manufacture carbon steel Phillips countersunk self-drilling screws through a fully integrated production process including cold heading, precision drill point forming, thread rolling, controlled carburizing heat treatment, and automated surface finishing. Drill point geometry is engineered according to different steel thickness capacities (#2 / #3 / #4 / #5). Carburizing depth and hardness distribution are strictly controlled to achieve a hardened drilling tip and thread surface while maintaining a ductile core to prevent brittle fracture during high-speed installation. Each production batch undergoes torsional strength testing, drilling performance testing, metallographic inspection, coating thickness verification, and dimensional control to ensure stable mechanical performance and reliable on-site installation.

Standard countersunk self-drilling screw dimensions are manufactured according to DIN and ISO standards. Custom drawings and samples are accepted.

Type: Carbon Steel Phillips Countersunk Self-Drilling Screw
Diameter Range: ST3.5 – ST6.3
Length Range: 13 mm – 150 mm
Thread Type: Self-Drilling Thread
Drive Type: Phillips (Cross Recess)
Drill Point: #2 / #3 / #4 / #5
Standard: DIN 7504P / ISO 15482
Tolerance: According to standard or customer drawing.

We supply self-drilling screws in materials including: Carbon Steel (C1022, 10B21, 35#, 45#), Alloy Steel (SCM435), and other materials upon request.

Strength Grades: Carbon steel Phillips countersunk self-drilling screws are available in strength grades: 4.8, 8.8, 10.9, 12.9, 14.9. Mechanical properties are controlled in accordance with ISO 898-1 where applicable. Controlled carburizing heat treatment ensures optimized surface hardness for drilling efficiency while maintaining core toughness for reliable torsional performance.

Surface Treatment: To improve corrosion resistance and service life, we offer the following surface finishes: Zinc plated (blue / white / yellow), Black oxide, Hot dip galvanized (selected structural sizes), Zinc flake coating, Phosphate, Dacromet. Coating thickness and salt spray performance can be adjusted according to application environment requirements. RoHS-compliant surface treatments are available for export and electronic equipment applications.

Applications: In mechanical equipment manufacturing, ZSD Screw carbon steel Phillips countersunk self-drilling screws are widely used in sheet metal housings, structural panels, ventilation systems, and light steel frame assemblies where flush surface installation is required. The countersunk head ensures smooth surface alignment, reducing interference with adjacent components. The Phillips drive supports efficient installation in automated assembly lines and maintenance operations.

In electronic equipment and industrial electronics, these screws are applied in control cabinets, electrical enclosures, instrument panels, and protective covers. The flush head design helps maintain flat panel surfaces for sealing, labeling, and aesthetic consistency. ZSD Screw maintains precise cross recess geometry to reduce cam-out and ensure stable torque transmission during repetitive assembly cycles.

In the new energy sector, carbon steel Phillips countersunk self-drilling screws are used in photovoltaic mounting systems, inverter enclosures, battery cabinets, and energy storage assemblies. The flush head structure minimizes surface obstruction in bracket systems and panel installations. Corrosion-resistant coatings such as zinc flake or Dacromet improve long-term performance under outdoor exposure and temperature fluctuation.

In conventional and renewable power generation facilities, these screws are used in cable tray covers, monitoring equipment panels, structural cladding, and auxiliary steel assemblies. Reliable drilling capacity and consistent case hardness allow secure fastening into structural steel members while maintaining a flat finished surface. ZSD Screw ensures stable drill point performance to support safe and efficient on-site installation.

In the automotive and transportation industries, Phillips countersunk self-drilling screws are widely applied in truck body panels, trailer skins, rail interior panels, and lightweight structural components. The flush head design supports aerodynamic surfaces and interior trim alignment. Consistent torsional strength and dimensional control ensure reliable fastening quality in high-volume production environments.

In heavy industry and engineering equipment manufacturing, these screws are used in steel structure cladding, machinery guards, industrial enclosures, and maintenance-access panels where a flat surface finish is required. Through integrated production control, traceable raw material sourcing, and systematic mechanical testing, ZSD Screw provides fastening solutions designed for structural stability, installation efficiency, and long-term industrial reliability.