Hex Socket Head Cap Screw

Standards

Global Standards & Dimensional Compliance: 

ISO 4762 / DIN 912:> Metric series with head diameter = 1.5× nominal thread diameter (e.g., M8 head = 12 mm). Thread lengths follow 1×, 1.5×, or 2× diameter rules.
ASME B18.3 (Imperial): Unified thread series (e.g., 1/4"-20 UNC) with deeper hex sockets (0.050"–0.250" deeper than ISO) for ANSI-spec hex keys.
JIS B 1177: Japanese standard emphasizing reduced head height (0.8× diameter) and rounded socket edges to minimize crack initiation.

Materials

1.Carbon & Alloy Steels
Medium Carbon Steel: Cost-effective, general-purpose fastening (e.g., machinery, automotive).
Alloy Steel (e.g., 34CrMo4): Ultra-high strength for heavy-duty applications (construction, industrial equipment).

2.Stainless Steels
AISI 304/316: Corrosion-resistant for marine, food, and chemical environments.
17-4PH Stainless: High-strength, heat-treated for aerospace and medical devices.

3.Titanium Alloys
Ti-6Al-4V: Lightweight, biocompatible, used in aerospace and medical implants.

4.Nickel-Based Alloys
Inconel 718: Heat-resistant for extreme temperatures (jet engines, oil/gas industries).
High-Performance Polymers

5.Aluminum Alloys
7075-T6: Lightweight with moderate strength for drones and optical systems.

6.Copper Alloys
Beryllium Copper: Non-sparking, conductive for explosive environments and electrical systems.

Applications

Aerospace:
Ti-6Al-4V HSCSs secure carbon-fiber reinforced polymer (CFRP) panels in aircraft wings, with fatigue limits exceeding 10⁷ cycles at 250 MPa R=0.1.

Medical Robotics:
M1.2 screws (Grade 12.9) with Parylene coating assemble surgical robotic arms, achieving 0.01 mm positional repeatability under sterilization.

Electric Vehicles:
Serrated flange HSCSs (DIN 6921) clamp battery busbars, maintaining contact resistance <0.5 mΩ under 50 N·m torque and thermal cycling (-40°C to 120°C).

Quantum Computing:
Gold-plated oxygen-free copper screws provide ultra-low electrical resistance (<0.001 Ω) in cryogenic superconducting circuits.

Advantages

1. High Torque Transmission
Internal Hex Drive: Allows precise torque application with minimal slippage, even in high-stress conditions.
Deep Socket Design: Distributes force evenly, reducing tool wear (e.g., ISO-compliant hex keys).

2. Space-Saving Profile
Low-Profile Head: Cylindrical head occupies minimal vertical space, ideal for compact assemblies (e.g., drones, microelectronics).
No Protruding Parts: Eliminates interference with adjacent components in densely packed systems.

3. Superior Strength-to-Size Ratio
High-Grade Materials: Alloy steel (e.g., 12.9 grade) achieves tensile strengths exceeding 1,200 MPa.
Optimized Thread Engagement: Full or partial threads reduce stress concentration points.

4. Corrosion Resistance
Material Versatility: Options include A4 (316) stainless steel, titanium, and coated alloys (e.g., Dacromet®).
Surface Treatments: Zinc-nickel plating or Xylan® coatings enhance durability in harsh environments.

5. Broad Standardization
Global Compliance: Adheres to ISO 4762, ASME B18.3, and JIS B 1177, ensuring interchangeability.
Metric/Imperial Options: Available in both measurement systems for cross-industry compatibility.

6. Vibration Resistance
Thread Locking Options: Compatible with adhesives (e.g., Loctite®) or serrated flanges (DIN 6921) to prevent loosening.

7. Thermal Stability
High-Temp Alloys: Inconel 718 retains strength at 700°C, suitable for jet engines or industrial furnaces.
Low-Temp Performance: Titanium screws function reliably in cryogenic environments (e.g., space applications).

8. Aesthetic Flexibility
Custom Finishes: Black oxide, anodized aluminum, or polished surfaces for visible assemblies (e.g., luxury automotive interiors).

9. Lightweight Solutions
Titanium/Polymer Options: Reduce weight by 40–60% compared to steel, critical for aerospace and medical devices.

10. Smart Integration
IoT-Enabled Variants: Embedded sensors monitor preload force or corrosion levels for predictive maintenance.

Materials

Product Services

1.After-sales quality control: After finished product inspection, ensure that it meets customer requirements.

2.Cooperation services: We can provide customers with OEM and ODM services to customize products to ensure that customer requirements are met.