etric ISO 7380-2 Socket Flanged Button Head Screws
A: The ISO 7380-2 standard defines a button head socket cap screw with an integrated flange. It is a variant of the standard button head screw (ISO 7380-1), where the built-in flange eliminates the need for a separate washer, simplifies installation, and provides a wider bearing surface.
This fastener retains the low-profile, rounded contour of the standard button head, free from sharp edges, offering both safety and a neat appearance. Combined with the hex socket drive, it is well-suited for applications requiring a clean look, scratch prevention, and reliable clamping force in confined spaces.
The choice depends on the application's requirements for strength, corrosion resistance, and appearance. The key differences are as follows:
| Material | Core Features & Advantages | Best For | Considerations |
| Stainless Steel (18-8 / A2) | Good corrosion resistance, non-magnetic (in annealed state). The flange protects soft material surfaces. | Damp, outdoor, or general industrial environments requiring rust resistance without extreme strength demands. | Lower mechanical strength than alloy steel; not suitable for strong chemical corrosion. |
| Stainless Steel (316 / A4) | Excellent corrosion resistance, withstands harsh weather, saltwater, and most chemicals. | Highly corrosive environments like marine settings, chemical plants, food processing. | Lower strength than alloy steel; higher cost than 18-8 stainless steel. |
| Alloy Steel (Black-Oxide) | Highest strength, with tensile strength significantly greater than stainless steel. The flange provides bearing surface protection. | High-load, high-strength mechanical applications in dry or indoor environments. | The black-oxide finish offers only minimal rust protection and is not suitable for damp or corrosive environments. |
| CLICK VIEW ONLIN | ISO 7380-2 Dimensions | ISO 7380-2 weight chart |
| CLICK DOWNLOAD | ISO 7380-2 Dimensions pdf | ISO 7380-2 weight chart pdf |
| PIC | PRODUCT | SIZE | GRADE | FINISH | THREAD |
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Socket Flanged Button Screws (ISO 7380-2) - Stainless Steel (A2) | M3-M10 | A2 Grade | Black | Coarse |
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Socket Flanged Button Screws (ISO 7380-2) - Marine Stainless Steel (A4) | M3-M10 | A4 Grade | Natural | Coarse |
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Socket Flanged Button Screws (ISO 7380-2) - High Tensile Steel (10.9) | M3-M10 | 10.9 Grade | Natural | Coarse |