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Flanges & Components > ConFlat (CF) Flanges & Components

CF Flanges (Aluminum A2219)

The CF (ConFlat) flange is the most widely used for high vacuum and UHV applications. Many gauges, instruments, accessories and feedthroughs are available on this flange system.

The seal mechanism is a knife-edge that is machined below the flange's flat surface. As the bolts of a flange-pair are tightened, the knife-edges make annular grooves on each side of a soft metal gasket. The extruded metal fills all the machining marks and surface defects in the flange, yielding a leak-tight seal. The CF seal operates from 760 torr (103 mbar) to < 1 x 10-13 Torr (< 1.3 x 10-13 mbar), and within the temperature range -196° C to 450° C (depending on material). Flange sizes in North America are normally referenced by their outside diameter (O.D.). However, in Europe and much of Asia, the nominal internal diameter (nominal I.D.) of the largest tube that can be welded to a bored flange is usually referenced in their nomenclature.

Aluminum Features:

  • Lightweight and non-magnetic for applications sensitive to magnetic materials
  • Good thermal conductivity
  • Lower residual radioactivity than flanges manufactured from ferrous materials
  • General properties of aluminum and the surface preparation of these flanges yield low outgassing rates
  • Knife-edges of flanges coated with CrN for added hardness
  • CrN coating maximum temperature on the knife edges is 150°C
  • Aluminum flanges require the use of aluminum gaskets

NOTE: Part numbers for reference only. Hardware not include with flange.

ISO Standard Our CF Flanges and Gaskets are compatible to the ISO Standard 3669-2 Specification.

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Ordering Table

(Click column headers to sort data)

Flange
Size/OD
Nominal
Tube OD
Type Bolt
Holes
Flange
Thickness
Flange
BCD
Flange Neck
Wall
Overall
Length
PartNo Price Add Item
VacuCADSM
Flange
Size/OD
Nominal
Tube OD
Type Bolt
Holes
Flange
Thickness
Flange
BCD
Flange Neck
Wall
Overall
Length
PartNo Price Add Item
VacuCADSM
1-1/3" N/A Blank 6 0.31 1.06 n/a N/A
F0133A000N
$91.00
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1-1/3" 0.79 Weldneck 6 0.31 1.06 0.12 1.97
F0133A055W
$150.00
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2-3/4" N/A Blank 6 0.51 2.31 n/a N/A
F0275A000N
$133.00
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2-3/4" 1.7 Weldneck 6 0.51 2.31 0.12 3.94
F0275A150W
$253.00
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4-1/2" N/A Blank 8 0.71 3.63 n/a N/A
F0450A000N
$201.00
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4-1/2" 2.76 Weldneck 8 0.71 3.63 0.12 3.94
F0450A250W
P.O.R.
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6" N/A Blank 16 0.83 5.13 n/a N/A
F0600A000N
$376.00
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6" 4.33 Weldneck 16 0.83 5.13 0.2 3.94
F0600A400W
$763.00
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8" N/A Blank 20 0.87 7.13 n/a N/A
F0800A000N
$577.00
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8" 6.3 Weldneck 20 0.87 7.13 0.2 3.94
F0800A600W
$1,015.00
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10" N/A Blank 24 0.98 9.13 n/a N/A
F1000A000N
$1,206.00
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10" 8.27 Weldneck 24 0.98 9.13 0.2 2.56
F1000A800W
$1,561.00
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Flange Selection Guide
With a variety of flanges to choose from, the Flange Selection Guide is designed to help you find one to meet your vacuum requirements. Shop Now!
Can't find the flange you need or want a custom configuration? Please call us at 1-412-387-9200 or email international@lesker.com with your inquiry.

Accessories Table

Description For Per Package Weight lbs (kg) Manual PartNo Price Add Item
VacuCADSM
Description For Per Package Weight lbs (kg) Manual PartNo Price Add Item
VacuCADSM
Aluminum Gaskets
All 1-1/3" (DN16CF) Flanges
10
1/4 (0.11)
--
GA-0133AL
$64.00
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Aluminum Gaskets
All 2-3/4" (DN35-DN40CF) Flanges
10
1/4 (0.11)
--
GA-0275AL
$86.00
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Aluminum Gaskets
All 3-3/8" (DN50CF) Flanges
10
1/4 (0.11)
--
GA-0337AL
$107.00
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Aluminum Gaskets
All 4-1/2" (DN63CF) Flanges
10
1/4 (0.11)
--
GA-0450AL
$128.00
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Aluminum Gaskets
All 6" (DN100CF) Flanges
10
1/2 (0.22)
--
GA-0600AL
$170.00
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Aluminum Gaskets
All 8" (DN160CF) Flanges
10
1/2 (0.22)
--
GA-0800AL
$237.00
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Aluminum Gaskets
All 10" (DN200CF) Flanges
10
1/2 (0.22)
--
GA-1000AL
$268.00
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Bolt & Nut Set
1-1/3" (DN16CF) Al Flanges
-
1/4 (0.11)
--
HBSM4X22A
$58.00
N/A
Bolt & Nut Set
2-3/4" (DN35/40CF) Al Flanges
-
1 (0.44)
--
HBSM6X35A
$58.00
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Hex Head Bolt & Nut Sets (Clearance Flanges)
10" (DN200CF) Al Flanges
-
2 (0.91)
--
HBSM8X65A
P.O.R.
N/A
Hex Head Bolt & Nut Sets (Clearance Flanges)
12" (DN250CF) Al Flanges
-
2 (091)
--
HBSM8X70A
$416.00
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Gasket Clips for CF Flanges
All CF Flanges
10
1/4 (0.11)
Download PDF
VGC0275S
$61.00
N/A
Gasket Removal Tool
All CF Flanges
1
1/4 (0.11)
--
VZGRT
$38.00
N/A
4 oz. Tube Anti-Seize Thread Lube
All CF Flanges
1
1/4 (0.11)
--
VZTL-4OZ
P.O.R.
N/A

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