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Flex Metal Bellows — Edge Welded with CF Flanges


Flanges & Components > ConFlat (CF) Flanges & Components > ConFlat (CF) Flanged Bellows

We fabricate these CF flanged edge-welded bellows for UHV systems from 347 stainless steel hoses and 304L stainless steel knife-edge (ConFlat) flanges. In contrast to hydraulically formed metal hoses, edge-welded bellows are very flexible and tend to spring back to their natural length (typically midway between their extended and compressed lengths) when not under vacuum. The CF flange is the most widely used for high vacuum and UHV applications. Many gauges, instruments, accessories and feedthroughs are available on this flange system.

Edge-Welded Bellows Feature:

  • Very flexible
  • Spring-back to their natural length when not under vacuum
NOTE: The compressed and extended lengths given in the table below applies to the whole assembly. The bellow's stroke can be calculated by subtracting the compressed length from the extended length. The free (relaxed or natural) length is approximately equal to the stroke. Additional segments can be custom ordered to facilitate more stroke. The Bellows should not be compressed or extended beyond the recommended length.

Dimensional Drawings


Note: These hoses and bellows terminate in 304L stainless steel CF flanges (one fixed, one rotatable). We can supply other terminations, such as tube ends, and KF or ISO vacuum flanges. The lengths listed are for one segment; we offer longer or shorter bellows on request. The last numeral in the part number refers to the flange style bellows as shown in Figures 1, 2, & 3.

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Ordering Table

(Click column headers to sort data)

Flange Size Fig. Bellows OD Bellows ID Length
(extended)
Length
(compressed)
Spring Rate (lbs/in2) PartNo Price Add Item
VacuCADSM
Flange Size Fig. Bellows OD Bellows ID Length
(extended)
Length
(compressed)
Spring Rate (lbs/in2) PartNo Price Add Item
VacuCADSM
1-1/3" 1 0.75 0.25 1.37 1 29
MEW0750251C1
P.O.R.
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1-1/3" 2 1.03 0.55 1.34 1 23
MEW1030551C2
P.O.R.
(please log in)
1-1/3" 3 1.03 0.55 1.84 1.5 23
MEW1030551C3
P.O.R.
(please log in)
2-3/4" 1 1.5 0.96 1.85 1.4 29
MEW1500961C1
P.O.R.
(please log in)
2-3/4" 2 1.89 1.39 2.02 1.45 27
MEW1891391C2
P.O.R.
(please log in)
2-3/4" 3 1.89 1.39 2.62 2.05 27
MEW1891391C3
P.O.R.
(please log in)
3-3/8" 1 2 1.25 2.47 1.84 28
MEW2001251C1
P.O.R.
(please log in)
2-3/4" 2 2.25 1.5 2.07 1.44 31
MEW2251501C2
P.O.R.
(please log in)
2-3/4" 3 2.25 1.5 2.67 2.04 31
MEW2251501C3
P.O.R.
(please log in)
4-1/2" 1 2.75 1.75 2.89 2.04 23
MEW2751751C1
P.O.R.
(please log in)
3-3/8" 2 3 2 2.75 1.9 25
MEW3002001C2
P.O.R.
(please log in)
3-3/8" 3 3 2 3.35 2.5 25
MEW3002001C3
P.O.R.
(please log in)
4-1/2" 2 3.5 2.5 2.89 2 21
MEW3502501C2
P.O.R.
(please log in)
4-1/2" 3 3.5 2.5 3.49 2.6 21
MEW3502501C3
P.O.R.
(please log in)
6" 3 4.97 4 3.94 3.04 22
MEW4974001C3
P.O.R.
(please log in)
8" 3 7.5 6 4.6 3.26 16
MEW7506001C3
P.O.R.
(please log in)
10" 3 9.5 8.5 4.13 3.32 122
MEW9508501C3
P.O.R.
(please log in)

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
1/4 Hard OFHC Copper Gasket
1-1/3" (DN16CF) Flanges
10
1/4 (0.11)
--
GA-0133
$20.90
(please log in)
1/4 Hard OFHC Copper Gasket
2-3/4" (DN35-DN40CF) Flanges
10
1/4 (0.11)
--
GA-0275
$27.20
(please log in)
1/4 Hard OFHC Copper Gasket
3-3/8" (DN50CF) Flanges
10
1/2 (0.22)
--
GA-0337
$30.90
(please log in)
1/4 Hard OFHC Copper Gasket
4-1/2" (DN63CF) Flanges
10
3/4 (0.34)
--
GA-0450
$37.00
(please log in)
1/4 Hard OFHC Copper Gasket
6" (DN100CF) Flanges
10
1-1/2 (0.68)
--
GA-0600
$55.00
(please log in)
1/4 Hard OFHC Copper Gasket
8" (DN160CF) Flanges
10
2 (0.91)
--
GA-0800
$78.00
(please log in)
1/4 Hard OFHC Copper Gasket
10" (DN200CF) Flanges
10
3 (1.36)
--
GA-1000
$96.00
(please log in)
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

ISO:9001 The Kurt J. Lesker Company is an ISO:9001 certified company. Copyright ©1996-2017 Kurt J. Lesker Company® All rights reserved.