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Flanges & Components > CF Flanges & Components > Standard Flanges (304L SS)

1-1/3" O.D. CF Flanges

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 10-12 torr (<1.3 x 10-12 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.

ConFlat flanges are offered in four versions:

  • Fixed flange: is a one piece design where the bolt-hole orientation is fixed with respect to that fitting.
  • Rotatable flange: is comprised of two parts, an inner weld ring and outer bolt ring. This enables the bolt ring to rotate about the inner weld ring.

Both Fixed and Rotatable flanges are available with your choice of clearance-holes or tapped holes.

  • Clearance-holes: Are through-holes that allow adequate clearance for bolts to go through both flanges and secured by nuts or plate nuts.
  • Tapped holes: Are imperial or metric threaded holes machined through the flange. This allows a clearance-hole flange to be connected without the need for nuts or plate nuts. Be aware of a components bolt hole orientation when selecting tapped flanges.

Dimensional Drawings

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Ordering Table

(Click column headers to sort data)
Flange
Size
Fig. Type Bore Dim
A
Dim
B
Dim
C
Dim
D
Dim
E
Dim
F
Bolt
Holes
Bolt Hole
Diam.
Thread
Size
Weight
lbs
PartNo Price Add Item
VacuCADSM
1.33 1 Fixed Blank n/a 0.3 n/a 1.06 n/a n/a 6 0.17 n/a 0.25 F0133X000N $12.90
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1.33 1 Fixed Tapped Blank n/a 0.3 n/a 1.06 n/a n/a 6 n/a 8-32 0.25 F0133X000NT $17.00
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1.33 4 Fixed Tapped Blank n/a 0.3 0.5 1.06 0.06 0.67 6 n/a 8-32 0.25 F0133X000NTW $18.00
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1.33 4 Fixed Blank n/a 0.3 0.5 1.06 0.06 0.67 6 0.17 n/a 0.25 F0133X000NW $12.90
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1.33 6 Rotatable Blank n/a 0.3 n/a 1.06 n/a n/a 6 0.17 n/a 0.25 F0133X000R $14.00
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1.33 6 Rotatable Tapped Blank n/a 0.3 n/a 1.06 n/a n/a 6 n/a 8-32 0.25 F0133X000RT $32.00
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1.33 9 Rotatable Tapped Blank n/a 0.3 0.5 1.06 0.06 0.67 6 n/a 8-32 0.25 F0133X000RTW $32.00
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1.33 9 Rotatable Blank n/a 0.3 0.5 1.06 0.06 0.67 6 0.17 n/a 0.25 F0133X000RW $22.00
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1.33 2 Fixed 0.26 n/a 0.3 n/a 1.06 n/a n/a 6 0.17 n/a 0.25 F0133X025N $12.90
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1.33 2 Fixed Tapped 0.26 n/a 0.3 n/a 1.06 n/a n/a 6 n/a 8-32 0.25 F0133X025NT $17.00
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1.33 7 Rotatable 0.26 n/a 0.3 n/a 1.06 n/a n/a 6 0.17 n/a 0.25 F0133X025R $14.00
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1.33 7 Rotatable Tapped 0.26 n/a 0.3 n/a 1.06 n/a n/a 6 n/a 8-32 0.25 F0133X025RT $32.00
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1.33 2 Fixed 0.38 n/a 0.3 n/a 1.06 n/a n/a 6 0.17 n/a 0.25 F0133X037N $12.90
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1.33 2 Fixed Tapped 0.38 n/a 0.3 n/a 1.06 n/a n/a 6 n/a 8-32 0.25 F0133X037NT $17.00
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1.33 7 Rotatable 0.38 n/a 0.3 n/a 1.06 n/a n/a 6 0.17 n/a 0.25 F0133X037R $14.00
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1.33 7 Rotatable Tapped 0.38 n/a 0.3 n/a 1.06 n/a n/a 6 n/a 8-32 0.25 F0133X037RT $18.10
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1.33 2 Fixed 0.51 n/a 0.3 n/a 1.06 n/a n/a 6 0.17 n/a 0.25 F0133X050N $12.90
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1.33 4 Fixed Tapped 0.505 n/a 0.3 n/a 1.062 n/a n/a 6 n/a M4 0.25 F0133X050NM P.O.R.
N/A
1.33 2 Fixed Tapped 0.51 n/a 0.3 n/a 1.06 n/a n/a 6 n/a 8-32 0.25 F0133X050NT $17.00
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1.33 7 Rotatable 0.51 n/a 0.3 n/a 1.06 n/a n/a 6 0.17 n/a 0.25 F0133X050R $14.00
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1.33 7 Rotatable Tapped 0.51 n/a 0.3 n/a 1.06 n/a n/a 6 n/a 8-32 0.25 F0133X050RT $32.00
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1.33 4 Fixed 0.63 n/a 0.3 n/a 1.062 n/a n/a 6 0.172 n/a 0.25 F0133X062N P.O.R.
N/A
1.33 3* Fixed 0.63 0.76 0.3 0.18 1.06 n/a n/a 6 0.17 n/a 0.25 F0133X075N $12.90
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1.33 3* Fixed Tapped 0.63 0.76 0.3 0.18 1.06 n/a n/a 6 n/a 8-32 0.25 F0133X075NT $17.00
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1.33 5 Fixed Tapped 0.63 n/a 0.3 0.5 1.06 0.06 n/a 6 n/a 8-32 0.25 F0133X075NTW $17.00
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1.33 5 Fixed 0.63 n/a 0.3 0.5 1.06 0.06 0.67 6 0.17 n/a 0.25 F0133X075NW $12.90
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1.33 8* Rotatable 0.63 0.76 0.3 0.18 1.06 n/a n/a 6 0.17 n/a 0.25 F0133X075R $16.00
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1.33 8* Rotatable Tapped 0.63 0.76 0.3 0.18 1.06 n/a n/a 6 n/a 8-32 0.25 F0133X075RT $18.10
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1.33 10 Rotatable Tapped 0.63 n/a 0.3 0.5 1.06 0.06 0.67 6 n/a 8-32 0.25 F0133X075RTW $18.10
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1.33 10 Rotatable 0.63 n/a 0.3 0.5 1.06 0.06 0.67 6 0.17 n/a 0.25 F0133X075RW $14.00
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* Requires special welding techniques.


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
Flange Cap
All 1-1/3" (DN16CF) Flanges
1
1/4 (0.11)
--
F0133CAP
$1.05
N/A
1/4 Hard OFHC Copper Gasket
All 1-1/3" (DN16CF) Flanges
10
1/4 (0.11)
--
GA-0133
$20.20
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Silver-Plated Copper Gasket
All 1-1/3" (DN16CF) Flanges
1
1/4 (0.11)
--
GA-0133NSP
$4.20
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Fluorocarbon Gasket (Flat)
All 1-1/3" (DN16CF) Flanges
1
1/4 (0.11)
--
GA-0133V
$2.50
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8-32 PLATE NUT SET
1.33"OD
24
0.100 (0.45)
--
PN-0133
$35.00
N/A
M4 PLATE NUT SET
1.33"OD
24
0.100 (0.45)
--
PN-0133M
$62.00
N/A
8—32 x 3/4" Plate Nut & Bolt Set
1-1/3" (DN16CF) Through-hole CF Flanges
12
1/4 (0.11)
--
PNB-0133
$35.00
N/A
8—32 x 1/2" (Skt Hd) Bolt Kits
1-1/3" (DN16CF) Tapped CF Flanges
25
1/4 (0.11)
--
SBK832050
$13.00
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8—32 x 3/4" (Skt Hd) Bolt & Nut Set
1-1/3" (DN16CF) Through-hole CF Flanges
25
1/4 (0.11)
--
SBS832075
$34.00
N/A
Gasket Clips for CF Flanges
All 1-1/3" (DN16CF) Flanges
10
1/4 (0.11)
Download PDF
VGC0275S
$59.00
N/A
Annealed Copper Gasket
All 1-1/3" (DN16CF) Flanges
5
1/4 (0.11)
--
VZCUA19
$14.50
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Gasket Removal Tool
All 1-1/3" (DN16CF) Flanges
1
1/4 (0.11)
--
VZGRT
$36.20
N/A
4 oz. Tube Anti-Seize Thread Lube
All 1-1/3" (DN16CF) Flanges
1
1/4 (0.11)
--
VZTL-4OZ
P.O.R.
N/A
Fluorocarbon Gasket (Molded)
All 1-1/3" (DN16CF) Flanges
2
1/4 (0.11)
--
VZVIT19
$24.00
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