Hex Socket Anti-slip Flange Screws Stainless Steel M4 M5 M6 M8 Flat Head Hex Flange Screw

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What are Flange Screws

Flange Screws are specialized fasteners that integrate a built-in washer-like flange (a widened circular base) under the head. This design eliminates the need for a separate washer, providing better load distribution, vibration resistance, and a secure hold. They are commonly used in applications where space is limited or where a washer would be difficult to install separately.

Materials

Flange screws are available in various materials to suit different applications:

• Carbon Steel (Grade 4.8, 8.8, 10.9) – General-purpose, cost-effective

• Stainless Steel (A2/AISI 304, A4/AISI 316) – Corrosion-resistant for harsh environments

• Alloy Steel (Heat-treated) – High-strength applications

• Brass – Decorative or non-sparking uses

• Aluminum – Lightweight, corrosion-resistant applications

• Titanium – Aerospace & high-performance uses (lightweight & strong)

Surface Treatments

To enhance performance and durability, flange screws may undergo:

• Zinc Plating (Blue/White/Yellow) – Basic corrosion resistance

• Hot-Dip Galvanizing – Heavy-duty rust protection

• Black Oxide – Mild corrosion resistance & aesthetic finish

• Phosphate Coating – Improves paint adhesion & corrosion resistance

• Nickel/Chrome Plating – Decorative & wear-resistant

• Dacromet/Geomet Coating – High corrosion resistance for automotive

Specifications

Flange screws come in various sizes and designs, including:

• Head Types: Hex flange head, serrated flange head, Phillips/flat head with flange

• Thread Types: Metric (M4, M6, M8, etc.) or Imperial (#8, #10, 1/4″, etc.)

• Flange Diameter: Typically 1.5x to 2x the screw diameter for better load distribution

• Drive Types: Hex, Phillips, Torx, Slotted, or Socket

Applications

Flange screws are widely used in industries where vibration resistance and secure fastening are critical:
✔ Automotive – Engine components, body panels, brake systems
✔ Electronics – Securing PCBs, control panels
✔ Machinery & Equipment – Motor mounts, gearbox assemblies
✔ HVAC & Plumbing – Ductwork, pipe fittings
✔ Aerospace – Lightweight, high-strength fastening
✔ Furniture & Appliances – Assembly with reduced loosening risk

Excellent Case: Automotive Engine Mounting

Scenario:

A car manufacturer needs a secure fastening solution for engine mounts that can withstand constant vibration, heat, and mechanical stress without loosening over time.

Solution:

Hex Flange Screws (Grade 10.9, Zinc-Nickel Coated) are used to attach the engine mounting brackets to the chassis. The integrated flange distributes load evenly, preventing damage to the mounting surface. The serrated underside of the flange grips the material, reducing the risk of loosening due to engine vibrations.

Result:

✅ Vibration Resistance – Serrated flange prevents loosening under dynamic loads.
✅ Corrosion Protection – Zinc-nickel coating withstands under-hood heat and moisture.
✅ Space Efficiency – Eliminates the need for separate washers, saving assembly time.
✅ Long-Term Reliability – High-grade steel ensures durability under stress.