The INFICON ISO-K welding flange (steel 1.0831) forms the ISO-K connection on vacuum and high-vacuum lines. It comes in DN 63 and DN 100 and is designed and tested for a leak rate below 1×10⁻⁹ mbar·l/s.
| Connection | ISO-K (DN 63 / 100) |
| Manufacturing Standards | ISO 1609, DIN 28404, Pneurop 6606 |
| Material | Steel 1.0831 |
| Leak Rate | Designed and tested for below 1×10⁻⁹ mbar·l/s |
| Flange Outer Diameter (mm) | DN 63: 95 / DN 100: 130 |
| Weld Pipe Outer Diameter (mm) | DN 63: 76.1 / DN 100: 108 |
| Weld Pipe Inner Diameter (mm) | DN 63: 70.3 / DN 100: 102.2 |
| Flange Thickness (mm) | DN 63 and 100: 12 |
| Part Numbers | DN 63: 212-021 / DN 100: 212-022 |
| Environmental Compliance | Compliant with RoHS Directive 2011/65/EU |