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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
ISO Standard KJLC flanges & gaskets are compatible with ISO3669-2017, but more importantly are compliant to the stricter requirements of E2734/E2734M – 10.

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Notes:
  • Part numbers for reference only. Hardware not include with flange.
  • Aluminum bolt and nut sets are recommended when mounting aluminum flanges. The bolt sets are completely non-magnetic and offer a lightweight alternative to stainless steel.

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Ordering Table

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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 Manual
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Part Number Price In Stock Add Item
Description For Per Package Manual
VacuCADSM
Part Number Price In Stock Add Item
Gasket, Aluminum, DN16CF (1.33" OD) Flange , 0.837" OD, 0.640" ID, (1) Per Package All 1-1/3" (DN16CF) Flanges 10
(please log in)
GA-0133AL
$64.35 In Stock
Gasket, Aluminum, DN35CF-DN40CF (2.75" OD) Flange, 1.895" OD, 1.451" ID, (10) Per Package All 2-3/4" (DN35-DN40CF) Flanges 10
(please log in)
GA-0275AL
$86.45 In Stock
Aluminum Gaskets All 3-3/8" (DN50CF) Flanges 10
(please log in)
GA-0337AL
$107.55 Contact KJLC for Availability
Gasket, Aluminum, DN63CF (4.50" OD) Flange, 3.243" OD, 2.506" ID, (10) Per Package All 4-1/2" (DN63CF) Flanges 10
(please log in)
GA-0450AL
$128.65 In Stock
Gasket, Aluminum, For DN100CF (6.00" OD) Flange, 4.743" OD, 4.006" ID, (10) Per Package All 6" (DN100CF) Flanges 10
(please log in)
GA-0600AL
$170.85 In Stock
Gasket, Aluminum, DN160CF (8.00" OD) Flange, 6.743" OD, 6.007" ID, (10) Per Package All 8" (DN160CF) Flanges 10
(please log in)
GA-0800AL
$238.20 In Stock
Gasket, Aluminum, DN200CF (10.00" OD) Flange, 8.743" OD, 8.007" ID, (10) Per Package All 10" (DN200CF) Flanges 10
(please log in)
GA-1000AL
$269.35 In Stock
Hex Bolt, Nut & Washer Set, Aluminum, (6) M4 x 22mm Long Hex Bolts, (6) Hex Nuts, & (12) Flat Washers 1-1/3" (DN16CF) Al Flanges -
N/A
HBSM4X22A
$58.30 Contact KJLC for Availability
Hex Bolt, Nut & Washer Set, Aluminum, (6) M6 x 35mm Long Hex Bolts, (6) Hex Nuts, & (12) Flat Washers 2-3/4" (DN35/40CF) Al Flanges -
(please log in)
HBSM6X35A
$58.30 Contact KJLC for Availability
Hex Bolt, Nut & Washer Set, Aluminum, DN50CF (3.375" OD) & DN63CF (4.50" OD) Flanges, (8) M8 x 50mmlong Hex Bolts, (8) Hex Nuts & (16) Flat Washers 4-1/2" (DN63CF) Al Flanges -
(please log in)
HBSM8X50A
$120.50 Contact KJLC for Availability
Hex Bolt, Nut & Washer Set, Aluminum, (20) M8 X55mm Long Hex Bolts, (20) Hex Nuts, & (40) Flat Washers 6" (DN100CF) & 8" (DN160CF) Al Flanges -
(please log in)
HBSM8X55A
P.O.R. Contact KJLC for Availability
Hex Bolt, Nut & Washer Set, Aluminum, (24) M8 x 65mm Long Hex Bolts, (24) Hex Nuts, & (48) Flat Washers 10" (DN200CF) Al Flanges -
N/A
HBSM8X65A
P.O.R. Contact KJLC for Availability
Hex Head Bolt & Nut Sets (Clearance Flanges) 12" (DN250CF) Al Flanges -
(please log in)
HBSM8X70A
P.O.R. Contact KJLC for Availability
Gasket Clips, For All Conflat (CF) Flange Sizes, (10) Per Package All CF Flanges 10 Download PDF
N/A
VGC0275S
P.O.R. In Stock
Gasket Removal Tool, For All Conflat (CF) Flange Sizes All CF Flanges 1
N/A
VZGRT
$38.20 In Stock
Thread Lubricant, 4 Ounce Tube All CF Flanges 1
N/A
VZTL-4OZ
P.O.R. In Stock
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Contact Us - CF Flanges (Aluminum A2219)