China Countersunk Head Hex Socket Screw Manufacturer, Supplier, Factory

When it comes to high-performance fastening solutions in demanding applications, the Hex Socket Countersunk Head Screws stand out for their precision and reliability. These specialized screws are engineered to provide a flush surface finish, making them ideal for assemblies where a smooth, aerodynamic, or aesthetically pleasing surface is critical. Unlike standard Socket Head Cap Screws, the countersunk head design allows the screw to sit perfectly within a countersunk hole, eliminating any protrusion. The internal hex socket drive, characteristic of a Hexagonal Socket Head Cap Screw, offers superior torque transmission and a high level of security against cam-out, ensuring a tight and secure fit even in high-vibration environments. This combination of features makes these screws a top choice for industries ranging from aerospace and automotive to machinery and high-end consumer electronics.


The Countersunk Head Hex Socket Screw is defined by its meticulous design and robust material specifications. This fastener is manufactured to exacting standards, ensuring consistent performance and dimensional accuracy. Key parameters that define the Countersunk Head Hex Socket Screw are detailed below for clarity and professional specification.

  • Head Style: Countersunk (82° or 90° standard included angle)
  • Drive Type: Internal Hex Socket
  • Thread Type: Metric (e.g., M3, M4, M5, M6, M8) or Imperial (e.g., #4, #6, #8, #10, 1/4")
  • Material Grade: Typically available in Stainless Steel (A2/A4), Alloy Steel (Grade 8.8, 10.9, 12.9), and Brass.
  • Surface Finish: Plain, Black Oxide, Zinc Plated, or Passivated for corrosion resistance.
  • Standards: Commonly conforms to DIN 7991 and ISO 10642 standards.
Nominal Size (Metric) Socket Key Size (mm) Head Diameter (mm) Head Height (mm) Typical Tensile Strength (MPa)
M3 2.0 5.7 1.65 800 (A2-70)
M4 2.5 7.6 2.2 800 (A2-70)
M5 3.0 9.5 2.75 800 (A2-70)
M6 4.0 11.5 3.3 1000 (Grade 10.9)
M8 5.0 15.4 4.4 1000 (Grade 10.9)
Nominal Size (Imperial) Socket Key Size (inch) Head Diameter (inch) Head Height (inch) Typical Tensile Strength (ksi)
#4 3/32 0.225 0.065 Minimum 70
#6 1/8 0.270 0.086 Minimum 70
#8 5/32 0.312 0.112 Minimum 70
#10 3/16 0.375 0.135 Minimum 70
1/4" 1/4 0.500 0.172 Minimum 125

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