The ISO flange (also called Large ISO) is used for HV chamber ports and is available in two distinct styles; ISO-K which uses clamp fasteners and ISO-F which uses nut and bolt fasteners. A variety of bolt/clamp options permit joints between mixed ISO-K and -F flanges.
The design principles of ISO and KF seals are identical. Each flange face is counter-bored or grooved to receive a metal centering ring with an elastomeric o-ring around its O.D. As with KF, the ISO centering ring both aligns the flanges and holds the o-ring in place.
ISO flanges are limited (by the o-ring's properties) to applications with temperatures between ~0° C and 120–180° C, and pressure from atmosphere to ~10-8 torr or mbar.
Flange Size | Bore | Dim A | Dim B | Nominal Tube O.D. |
ISO63 | 73 | 76 | 6.4 | 76 |
ISO80 | 86 | 89 | 6.4 | 89 |
ISO100 | 105 | 108 | 6.4 | 108 |
ISO160 | 156 | 159 | 6.4 | 159 |
ISO200 | 216 | 219 | 6.4 | 219 |
ISO250 | 264 | 267 | 6.4 | 267 |
ISO320 | 319.5 | 324 | 9.5 | 324 |
ISO400 | 401 | 406 | 9.5 | 406 |
ISO500 | 503 | 508 | 9.5 | 508 |
ISO630 | 655.5 | 660 | 12.7 | 660 |