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FULLERKREG DIN 7603A flat sealing rings are manufactured to DIN 7603 Form A standard in aluminum (Al 1050 / Al 1060 equivalent, soft annealed) with a cleaned natural finish. DIN 7603 Form A is a flat (plain) sealing ring used for pipe flanges (DIN 3850), plug screws (DIN 908), ball-type pipe fittings, and hollow connections (DIN 7001). Aluminum sealing rings provide a lightweight alternative to copper, with excellent corrosion resistance to atmospheric conditions, oils, and fuels. The soft aluminum deforms plastically under bolt clamping load to create a reliable metal-to-metal seal. Aluminum sealing rings are widely used in automotive, hydraulic, and pneumatic applications where weight reduction is a priority and operating temperatures are within the aluminum service range.
All dimensions in millimeters (mm). Per DIN 7603 Form A.
| Nominal Size | d1 (ID) | d2 (OD) | b (thickness) |
|---|---|---|---|
| 6×10 | 6.0 | 10.0 | 1.5 |
| 6.5×10 | 6.5 | 10.0 | 1.5 |
| 7×11 | 7.0 | 11.0 | 1.5 |
| 8×12 | 8.0 | 12.0 | 1.5 |
| 8×13 | 8.0 | 13.0 | 1.5 |
| 8×14 | 8.0 | 14.0 | 1.5 |
| 9×13 | 9.0 | 13.0 | 1.5 |
| 10×13.5 | 10.0 | 13.5 | 1.5 |
| 10×14 | 10.0 | 14.0 | 1.5 |
| 10×16 | 10.0 | 16.0 | 1.5 |
| 11×15 | 11.0 | 15.0 | 1.5 |
| 12×16 | 12.0 | 16.0 | 1.5 |
| 12×18 | 12.0 | 18.0 | 1.5 |
| 12×20 | 12.0 | 20.0 | 1.5 |
| 13×17 | 13.0 | 17.0 | 1.5 |
| 14×18 | 14.0 | 18.0 | 1.5 |
| 14×20 | 14.0 | 20.0 | 1.5 |
| 15×19 | 15.0 | 19.0 | 1.5 |
| 16×20 | 16.0 | 20.0 | 1.5 |
| 16×22 | 16.0 | 22.0 | 1.5 |
| 17×21 | 17.0 | 21.0 | 1.5 |
| 18×22 | 18.0 | 22.0 | 1.5 |
| 18×24 | 18.0 | 24.0 | 1.5 |
| 19×23 | 19.0 | 23.0 | 1.5 |
| 20×24 | 20.0 | 24.0 | 1.5 |
| 20×26 | 20.0 | 26.0 | 1.5 |
| 21×25 | 21.0 | 25.0 | 1.5 |
| 22×27 | 22.0 | 27.0 | 1.5 |
| 22×29 | 22.0 | 29.0 | 1.5 |
| 24×29 | 24.0 | 29.0 | 1.5 |
| 24×32 | 24.0 | 32.0 | 1.5 |
| 26×32 | 26.0 | 32.0 | 1.5 |
| 27×32 | 27.0 | 32.0 | 1.5 |
| 28×34 | 28.0 | 34.0 | 1.5 |
| 29×36 | 29.0 | 36.0 | 2.0 |
| 30×36 | 30.0 | 36.0 | 2.0 |
| 32×38 | 32.0 | 38.0 | 2.0 |
| 33×40 | 33.0 | 40.0 | 2.0 |
| 34×40 | 34.0 | 40.0 | 2.0 |
| 35×42 | 35.0 | 42.0 | 2.0 |
| 36×41 | 36.0 | 41.0 | 2.0 |
| 38×44 | 38.0 | 44.0 | 2.0 |
| 40×46 | 40.0 | 46.0 | 2.0 |
| 40×47 | 40.0 | 47.0 | 2.0 |
| 42×48 | 42.0 | 48.0 | 2.0 |
| 44×50 | 44.0 | 50.0 | 2.0 |
| 45×52 | 45.0 | 52.0 | 2.0 |
| 48×55 | 48.0 | 55.0 | 2.0 |
| 50×57 | 50.0 | 57.0 | 2.0 |
| 52×59 | 52.0 | 59.0 | 2.0 |
| 55×62 | 55.0 | 62.0 | 2.0 |
| 58×65 | 58.0 | 65.0 | 2.0 |
| 60×67 | 60.0 | 67.0 | 2.0 |
| 62×70 | 62.0 | 70.0 | 2.0 |
| 65×72 | 65.0 | 72.0 | 2.0 |
| 68×75 | 68.0 | 75.0 | 2.0 |
| 70×78 | 70.0 | 78.0 | 2.0 |
| 72×80 | 72.0 | 80.0 | 2.0 |
| 75×83 | 75.0 | 83.0 | 2.0 |
| 78×86 | 78.0 | 86.0 | 2.0 |
| 80×88 | 80.0 | 88.0 | 2.0 |
| 85×93 | 85.0 | 93.0 | 2.0 |
| 90×100 | 90.0 | 100.0 | 2.0 |
All dimensions in mm per DIN 7603 Form A. d1 = inner diameter; d2 = outer diameter; b = thickness. Sizes d1 6–28mm: b = 1.5mm. Sizes d1 29–90mm: b = 2.0mm.
| Property | Aluminum (This Product) | Copper T3 |
|---|---|---|
| Density | 2.7 g/cm³ — ~1/3 weight of copper | 8.9 g/cm³ |
| Max. service temperature | +150°C continuous | +300°C continuous |
| Hardness (soft) | 15–35 HV — very soft, excellent conformability | 40–65 HV |
| Corrosion resistance | Excellent — self-passivating oxide layer | Good — natural patina |
| Media compatibility | Oil, fuel, hydraulic fluid, water, air | Oil, fuel, hydraulic fluid, water, air, steam |
| Steam resistance | Not recommended above +150°C | Suitable up to +300°C |
| Weight advantage | Significant — preferred for automotive | Standard |
| Cost | Lower than copper | Higher |
| Feature | Form A (This Product) | Form C | Form D |
|---|---|---|---|
| Profile | Flat plain ring | Inner bead | Outer bead |
| Sealing area | Full flat face | Inner bead concentrates sealing force | Outer bead concentrates sealing force |
| Typical use | General pipe fittings, plug screws | Higher pressure, concentrated seal | Higher pressure, concentrated seal |
| Property | Value |
|---|---|
| Material Grade | Al 1050 / Al 1060 (equivalent, ≥99.5% Al) |
| Al Content | ≥99.5% |
| Condition | Soft annealed |
| Surface | Cleaned, natural aluminum finish — no coating |
| Hardness | 15–35 HV (very soft, excellent conformability) |
| Tensile Strength | 60–100 MPa |
| Elongation | ≥25% |
| Density | 2.7 g/cm³ |
| Max. Service Temperature | +150°C continuous |
| Corrosion Resistance | Excellent — self-passivating Al₂O₃ layer |
| Media Compatibility | Oil, fuel, hydraulic fluid, water, compressed air |
| RoHS / REACH | Compliant |
FULLERKREG DIN 7603A Aluminum Sealing Ring, Natural Finish:
| [ Photo 1 ] | [ Photo 2 ] | [ Photo 3 ] | [ Photo 4 ] |
Q: What is DIN 7603 Form A?
A: DIN 7603 Form A is a flat plain sealing ring (no bead) used for pipe flanges (DIN 3850), plug screws (DIN 908), and pipe fittings. The flat profile provides full-face sealing through plastic deformation of the soft metal under bolt clamping load.
Q: When should I choose aluminum over copper sealing rings?
A: Choose aluminum when weight reduction is a priority (automotive, aerospace), operating temperatures are below +150°C, and steam is not present. Choose copper when temperatures exceed +150°C, steam is present, or higher sealing force is required.
Q: Is aluminum suitable for fuel and oil sealing?
A: Yes. Aluminum has excellent compatibility with mineral oils, fuels, and hydraulic fluids. It is widely used in automotive oil drain plugs and fuel system fittings.
Q: Can aluminum sealing rings be reused?
A: Aluminum sealing rings are generally single-use. Unlike copper, aluminum cannot be easily re-annealed to restore softness. Replacement is recommended after each disassembly.
Q: Do you provide material test certificates?
A: Yes. Mill certificates and RoHS declarations available upon request.
FULLERKREG Fasteners — Precision DIN Standard Fasteners, Direct from Manufacturer.
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