VSM Flange Standard
What is SWISS/VSM flange standard?
Table of Contents
The SWISS/VSM flange standard (Swiss Industrial Standard/Verband Schweizerischer Maschinenindustrieller) is a standard for the design and dimensions of flanges used in machinery and equipment in Switzerland.
This standard specifies the dimensions and tolerances of flanges used in piping systems and other industrial applications.
The SWISS/VSM flange standard is based on the DIN (Deutsches Institut für Normung) standard, widely used in Europe.
The SWISS/VSM standard specifies the dimensions of flanges in metric units and includes a range of flange types, including weld neck flanges, slip-on flanges, threaded flanges, and blind flanges.
Dimensions of VSM Flanges
VSM flanges are available in various dimensions and pressure ratings. The flange dimensions are typically specified by the nominal pipe size (NPS), flange facing type, and pressure class. Common NPS sizes for VSM flanges range from DN 15 to DN 200. The facing types can be flat face, raised face, or RTJ (ring type joint). The dimensions and tolerances for VSM flanges are specified in the standard.
Dimensions of VSM 18703 flat flange for welding PN 6
| Original no. | Nominal diameter | pressure / bar | thickness [mm] | Ø Pipe | Ø diameter hole [mm] | Ø diameter circle [mm] | Number of holes | Ø Flange diameter |
| VSM 18695 | 25 | 6 | 12 | 33.7 | 11.5 | 75 | 4 | 100 |
| VSM 18695 | 32 | 6 | 14 | 42.4 | 14 | 90 | 4 | 120 |
| VSM 18695 | 40 | 6 | 14 | 48.3 | 14 | 100 | 4 | 130 |
| VSM 18695 | 50 | 6 | 14 | 60.3 | 14 | 110 | 4 | 140 |
| VSM 18695 | 65 | 6 | 14 | 76.1 | 14 | 130 | 4 | 160 |
| VSM 18695 | 80 | 6 | 16 | 88.9 | 18 | 150 | 4 | 190 |
| VSM 18695 | 100 | 6 | 16 | 108 | 18 | 170 | 4 | 210 |
| VSM 18695 | 100 | 6 | 16 | 114.3 | 18 | 170 | 4 | 210 |
| VSM 18695 | 125 | 6 | 18 | 133 | 18 | 200 | 8 | 240 |
| VSM 18695 | 125 | 6 | 18 | 139.7 | 18 | 200 | 8 | 240 |
| VSM 18695 | 150 | 6 | 20 | 159 | 18 | 225 | 8 | 265 |
| VSM 18695 | 150 | 6 | 20 | 168.3 | 18 | 225 | 8 | 265 |
| VSM 18695 | 200 | 6 | 22 | 219.1 | 18 | 280 | 8 | 320 |
| VSM 18696 | 200 | 10 | 26 | 219.1 | 22 | 295 | 8 | 340 |
Dimensions of VSM 18703 flat flange for welding PN 10
| Original no. | Nominal diameter | pressure / bar | thickness [mm] | Ø Pipe | Ø diameter hole [mm] | Ø diameter circle [mm] | Number of holes | Ø Flange diameter |
| VSM 18696 | 200 | 10 | 26 | 219.1 | 22 | 295 | 8 | 340 |
Dimensions of VSM 18703 flat flange for welding PN 16
| Original no. | Nominal diameter | pressure / bar | thickness [mm] | Ø Pipe | Ø diameter hole [mm] | Ø diameter circle [mm] | Number of holes | Ø Flange diameter |
| VSM 18697 | 15 | 10-16 | 12 | 21.3 | 14 | 65 | 4 | 95 |
| VSM 18697 | 25 | 10-16 | 14 | 33.7 | 14 | 85 | 4 | 115 |
| VSM 18697 | 32 | 10-16 | 16 | 42.4 | 18 | 100 | 4 | 140 |
| VSM 18697 | 40 | 10-16 | 16 | 44.5 | 18 | 110 | 4 | 150 |
| VSM 18697 | 40 | 10-16 | 16 | 48.3 | 18 | 110 | 4 | 150 |
| VSM 18697 | 50 | 10-16 | 18 | 60.3 | 18 | 125 | 4 | 165 |
| VSM 18697 | 65 | 10-16 | 18 | 76.1 | 18 | 145 | 4 | 185 |
| VSM 18697 | 80 | 16 | 20 | 88.9 | 18 | 160 | 8 | 200 |
| VSM 18697 | 100 | 10-16 | 22 | 108 | 18 | 180 | 8 | 220 |
| VSM 18697 | 100 | 10-16 | 22 | 114.3 | 18 | 180 | 8 | 220 |
| VSM 18697 | 125 | 10-16 | 24 | 133 | 18 | 210 | 8 | 250 |
| VSM 18697 | 125 | 10-16 | 24 | 139.7 | 18 | 210 | 8 | 250 |
| VSM 18697 | 150 | 10-16 | 24 | 159 | 22 | 240 | 8 | 285 |
| VSM 18697 | 150 | 10-16 | 24 | 168.3 | 22 | 240 | 8 | 285 |
| VSM 18697 | 200 | 16 | 26 | 219.1 | 22 | 295 | 12 | 340 |
Dimensions of VSM 18703 weld neck flange PN 6
| Original no. | Nominal diameter | pressure / bar | thickness [mm] | Ø Pipe | Ø diameter hole [mm] | Ø diameter circle [mm] | Number of holes | Ø Flange diameter |
| VSM 18716 | 25 | 6 | 14 | 33.7 | 11.5 | 75 | 4 | 100 |
| VSM 18716 | 32 | 6 | 14 | 42.4 | 14 | 90 | 4 | 120 |
| VSM 18716 | 40 | 6 | 14 | 48.3 | 14 | 100 | 4 | 130 |
| VSM 18716 | 50 | 6 | 14 | 60.3 | 14 | 110 | 4 | 140 |
| VSM 18716 | 65 | 6 | 14 | 76.1 | 14 | 130 | 4 | 160 |
| VSM 18716 | 80 | 6 | 16 | 88.9 | 18 | 150 | 4 | 190 |
| VSM 18716 | 100 | 6 | 16 | 108 | 18 | 170 | 4 | 210 |
| VSM 18716 | 100 | 6 | 16 | 114.3 | 18 | 170 | 4 | 210 |
Dimensions of VSM 18703 weld neck flange PN 16
| Original no. | Nominal diameter | pressure / bar | thickness [mm] | Ø Pipe | Ø diameter hole [mm] | Ø diameter circle [mm] | Number of holes | Ø Flange diameter |
| VSM 18718 | 15 | 10-16 | 14 | 21.3 | 14 | 65 | 4 | 95 |
| VSM 18718 | 20 | 10-16 | 16 | 26.9 | 14 | 75 | 4 | 105 |
| VSM 18718 | 25 | 10-16 | 16 | 30 | 14 | 85 | 4 | 115 |
| VSM 18718 | 25 | 10-16 | 16 | 33.7 | 14 | 85 | 4 | 115 |
| VSM 18718 | 32 | 10-16 | 16 | 42.4 | 18 | 100 | 4 | 140 |
| VSM 18718 | 40 | 10-16 | 16 | 48.3 | 18 | 110 | 4 | 150 |
| VSM 18718 | 50 | 10-16 | 18 | 57 | 18 | 125 | 4 | 165 |
| VSM 18718 | 50 | 10-16 | 18 | 60.3 | 18 | 125 | 4 | 165 |
| VSM 18718 | 65 | 10-16 | 18 | 76.1 | 18 | 145 | 4 | 185 |
| VSM 18718 | 80 | 16 | 20 | 88.9 | 18 | 160 | 8 | 200 |
| VSM 18718 | 100 | 10-16 | 20 | 108 | 18 | 180 | 8 | 220 |
| VSM 18718 | 100 | 10-16 | 20 | 114.3 | 18 | 180 | 8 | 220 |
| VSM 18718 | 125 | 10-16 | 22 | 133 | 18 | 210 | 8 | 250 |
| VSM 18718 | 125 | 10-16 | 22 | 139.7 | 18 | 210 | 8 | 250 |
| VSM 18718 | 150 | 10-16 | 22 | 159 | 22 | 240 | 8 | 285 |
| VSM 18718 | 150 | 10-16 | 22 | 168.3 | 22 | 240 | 8 | 285 |
| VSM 18718 | 200 | 16 | 24 | 219.1 | 22 | 295 | 12 | 340 |
Dimensions of VSM 18703 blind flange
| Original no. | Nominal diameter | pressure / bar | thickness [mm] | Ø diameter hole [mm] | Ø diameter circle [mm] | Number of holes | Ø Flange diameter |
| VSM 18703 | 25 | 10-16 | 14 | 14 | 85 | 4 | 115 |
| VSM 18703 | 40 | 6 | 14 | 14 | 100 | 4 | 130 |
| VSM 18703 | 50 | 6 | 14 | 14 | 110 | 4 | 140 |
| VSM 18703 | 32 | 10-16 | 16 | 18 | 100 | 4 | 140 |
| VSM 18703 | 40 | 10-16 | 16 | 18 | 110 | 4 | 150 |
| VSM 18703 | 65 | 6 | 14 | 14 | 130 | 4 | 160 |
| VSM 18703 | 50 | 10-16 | 18 | 18 | 125 | 4 | 165 |
| VSM 18703 | 65 | 10-16 | 18 | 18 | 145 | 4 | 185 |
| VSM 18703 | 80 | 6 | 16 | 18 | 150 | 4 | 190 |
| VSM 18703 | 80 | 16 | 20 | 18 | 160 | 8 | 200 |
| VSM 18703 | 100 | 6 | 16 | 18 | 170 | 4 | 210 |
| VSM 18703 | 100 | 10-16 | 22 | 18 | 180 | 8 | 220 |
| VSM 18703 | 125 | 6 | 18 | 18 | 200 | 8 | 240 |
| VSM 18703 | 125 | 10-16 | 24 | 18 | 210 | 8 | 250 |
| VSM 18703 | 150 | 6 | 20 | 18 | 225 | 8 | 265 |
| VSM 18703 | 150 | 10-16 | 24 | 22 | 240 | 8 | 285 |
| VSM 18703 | 200 | 16 | 26 | 22 | 295 | 12 | 340 |
| VSM 18703 | 200 | 10 | 26 | 22 | 295 | 8 | 340 |
