Flat Head Hex Socket Screws – Flush-Fit Fastening for Structural and Aesthetic Precision

Flat head hex socket screws are advanced fasteners designed for flush-mounted joints where both performance and appearance matter. With a countersunk head and internal hex drive, these screws are widely used in mechanical assemblies, precision instruments, and components requiring clean surface integration.

Unlike traditional hex bolts, flat head socket screws sit completely embedded into pre-countersunk holes, offering smooth alignment, reduced profile, and safe handling—ideal for parts that move, slide, or rotate in tight tolerances.

🔩 Product Details

• Type: Flat Head Hex Socket Screw / Countersunk Allen Screw
• Drive Type: Internal Hexagon (Allen Key)
• Head Angle: Standard countersunk angle 90°
• Standards:
  • ISO 10642 (metric)
  • DIN 7991
  • ANSI B18.3 (inch)

Available Size Range:

• Metric: M3 × 10, M4 × 16, M5 × 25, M6 × 30, M8 × 40, M10 × 50, M12 × 60
• Inch: #6-32 × 1/2″, 1/4″-20 × 1″, 3/8″-16 × 1.5″

Materials:

• Alloy Steel (Grade 12.9, 10.9 – high tensile strength)
• Stainless Steel (A2-70, A4-80 – corrosion resistant)
• Carbon Steel (surface-hardened)

Finishes Available:

• Black Oxide
• Zinc Plated (Clear / Yellow)
• Passivated (SS)
• Phosphate Coated
• Plain / Oiled

⚙️ Precision Features
✔️ Flush fit design improves equipment safety and reduces snagging risk
✔️ Precision seating ensures uniform force distribution during tightening
✔️ High torque transfer via internal hex drive – minimal head deformation
✔️ Suitable for automated or manual assembly systems
✔️ Prevents material bulging and deformation in composite or thin sheet parts

🔧 Common Applications

• Robotics and Automation Brackets
• Aerospace and Aircraft Interior Fixtures
• Industrial Machinery Guards and Housings
• Automotive Trim and Structural Sub-assemblies
• Metal Furniture and Modular Racking Systems

📦 Supply & Service

• MOQ: 1,000 pcs per model
• Lead Time: 5–10 working days
• Packaging: Small box / Bulk carton / Pallet with labeling
• Customization: Head angle, logo marking, special coating supported

📩 Looking for low-profile, high-strength flat head hex socket screws that meet ISO and DIN standards?
We offer consistent quality, fast delivery, and tailored solutions for OEM and engineering partners worldwide. Request your catalog and free sample now.