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Basic reference for vacuum flange standards:

 

CF (Conflat)  Euro/Asian size     =     N.A. size (inches, dia.)

  • DN10     =     1.00"
  • DN16     =     1.33"
  • DN25     =     2.125"
  • DN40     =     2.75"
  • DN50     =     3.375"
  • DN63     =     4.50"
  • DN100     =     6.00"
  • DN160     =     8.00"
  • DN200     =    10.00"
  • DN250     =     12.00"

KF/QF        Klein Flange (KF) or NW, also DN

  • DN10KF
  • DN16KF
  • DN25KF
  • DN40KF
  • DN50KF

 

ISO   ISO flanges are known as LF, LFB or sometimes just ISO flange. ISO-K (or ISO LF) flanges are joined with double claw. The ISO-F (or ISO LFB) flanges have holes for attaching the two flanges with bolts.

  • DN63LF (63.5 mm)
  • DN100LF (102 mm)
  • DN160LF (160 mm)
  • DN200LF (200 mm)
  • DN250LF (254 mm)
  • DN320LF (316 mm)
  • DN400LF (400 mm)
  • DN500LF (500 mm)

 

ASA  Flange sizes are indicated by tube nominal ID, or by flange OD (in inches):

  • 1 (4.25 O.D.)
  • 1.5 (5.00 O.D.)
  • 2 (6.00 O.D.)
  • 3 (7.50 O.D.)
  • 4 (9.00 O.D.)
  • 6 (11.00 O.D.)
  • 8 (13.5 O.D.)
  • 10 (16.00 O.D.)