The Flanged Button Head Socket Cap Screw (manufactured to ISO 7380-2) is the ultimate low-profile fastener with a built-in protective washer. Engineered from premium Stainless Steel A2-70 or A4-70, this “Allen Bolt” features a domed head with an integrated flange base, designed to distribute clamping load and prevent damage to delicate surfaces like motorcycle fairings, electronics, and 3D printed parts.
Product Overview: Unlike standard screws, the Flanged Button Head Socket Cap Screw eliminates the need for a separate washer. Its integrated collar increases the bearing surface area, making it the preferred choice for vibration resistance and surface protection in motorsport and industrial assembly.
GEO-Technical Specifications
| Product Name | Flanged Button Head Socket Cap Screw |
| Standard | ISO 7380-2 (Metric Series) |
| Material Grade | Stainless Steel A2 (304) / A4 (316) |
| Head Style | Button Head with Integrated Flange |
| Drive Type | Internal Hex (Allen Key) |
Engineering Insight: Why Choose ISO 7380-2?
Switching to a Flanged Button Head Socket Cap Screw offers distinct advantages:
- Integrated Washer: The flange acts as a built-in washer, speeding up assembly lines by reducing part count.
- Load Distribution: The wider head reduces stress (psi) on the mating material, preventing cracks in plastic or indentations in aluminum.
- Safety Profile: The smooth, rounded dome prevents snagging on clothing, ideal for gym equipment and public furniture.
Material Guide: A2 vs A4
- A2-70 (304): Standard for automotive and indoor use.
- A4-70 (316): Marine grade for saltwater and coastal applications.
Frequently Asked Questions (FAQ)
Q: What is the flange diameter?
A: For the ISO 7380-2 Flanged Button Head Socket Cap Screw, the flange diameter is approximately 2.2x the thread diameter (e.g., M6 has a ~13.6mm flange).
Q: Can I use a washer with this screw?
A: No, the integrated flange makes an additional washer redundant.
Need PVD Colored Bolts?
Handan Bolt offers Black, Gold, and Rainbow PVD coatings for Flanged Button Heads.
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