DIN 6921 Hex Flange Screw Specifications
DIN 6921 Hex Flange Screws
US Equivalent: IFI 536 | Hex Flange Head Cap Screws
DIN 6921 defines hexagon head screws with integrated flange — a built-in washer that distributes load and provides anti-rotation resistance. Widely used in automotive, machinery, and structural applications.
Quick Specifications
Key Features
Integrated Washer
Built-in flange acts as a permanent washer — reduces assembly time and part count.
Load Distribution
Larger bearing surface spreads clamping force over a wider area, reducing surface damage.
Serrated Option
Serrated flange (teeth) bites into the surface for enhanced vibration resistance without lock washers.
Automotive Standard
Industry standard for chassis, body panels, engine components — used by all major OEMs.
Dimension Chart
| Size | Pitch | Flange Dia. (dc) | Head Height (k) | Wrench Size (s) |
|---|---|---|---|---|
| M5 | 0.8 mm | 11.8 mm | 5.0 mm | 8 mm |
| M6 | 1.0 mm | 14.2 mm | 6.0 mm | 10 mm |
| M8 | 1.25 mm | 17.9 mm | 7.5 mm | 13 mm |
| M10 | 1.5 mm | 21.8 mm | 9.0 mm | 15 mm |
| M12 | 1.75 mm | 26.0 mm | 10.5 mm | 18 mm |
| M16 | 2.0 mm | 34.5 mm | 14.0 mm | 24 mm |
Property Classes
Flange Types
✨ Plain (Smooth) Flange
- Smooth bearing surface
- Won't mar painted/finished surfaces
- Allows controlled re-torquing
- Use with soft materials
⚙️ Serrated Flange
- Teeth grip the surface
- Superior vibration resistance
- Eliminates need for lock washers
- Ideal for automotive/machinery
Common Applications
DIN 6921 vs IFI 536
💡 Metric vs Inch
DIN 6921 is the metric standard, while IFI 536 is the American inch-series standard for flange screws. Key differences:
- DIN 6921: Metric threads (M5, M6, M8, etc.)
- IFI 536: Inch threads (1/4-20, 5/16-18, 3/8-16, etc.)
- Similar design principles and performance
- Not dimensionally interchangeable
Shop DIN 6921 Hex Flange Screws
Available in Class 8.8 and 10.9. Plain or serrated flange options.
Shop Flange Screws