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Flanges & Components > Adapters & Couplings > Flange to Flange Adapters

KF (QF) to ASA Adapters—Flat & Grooved

Adapter flanges allow the mating of one type of flange system to another. All of our flange adapters are manufactured from 304 series stainless steel tubing and flanges.

NOTE: Mixing flange types using adapters is possible but not recommended unless necessary to match existing components or fittings. However, using one flange type for chamber-mounted components and another type for foreline components is common practice.

Dimensional Drawings

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Ordering Table

(Click column headers to sort data)

Flange
Size/OD
Nominal
Tube OD
Type ASA Flange
Size
ASA
Flange OD
Weight
lbs
PartNo Price Add Item
VacuCADSM
Flange
Size/OD
Nominal
Tube OD
Type ASA Flange
Size
ASA
Flange OD
Weight
lbs
PartNo Price Add Item
VacuCADSM
KF16 0.75 Flat 6 11 19
QF16XASA11
$361.00
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KF16 0.75 Grooved 6 11 19
QF16XASA11G
$412.00
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KF16 0.75 Flat 1 4.25 2
QF16XASA4
$160.00
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KF16 0.75 Grooved 1 4.25 2
QF16XASA4G
P.O.R.
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KF16 0.75 Flat 1.5 5 3
QF16XASA5
P.O.R.
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KF16 0.75 Grooved 1.5 5 3
QF16XASA5G
$196.00
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KF16 0.75 Flat 2 6 3
QF16XASA6
$243.00
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KF16 0.75 Grooved 2 6 3
QF16XASA6G
$263.00
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KF16 0.75 Flat 3 7.5 5
QF16XASA7
$243.00
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KF16 0.75 Grooved 3 7.5 5
QF16XASA7G
$268.00
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KF16 0.75 Flat 4 9 9
QF16XASA9
$258.00
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KF16 0.75 Grooved 4 9 9
QF16XASA9G
$294.00
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KF25 1 Flat 6 11 19
QF25XASA11
$366.00
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KF25 1 Grooved 6 11 19
QF25XASA11G
$418.00
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KF25 1 Flat 2 6 3
QF25XASA6
$191.00
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KF25 1 Grooved 2 6 3
QF25XASA6G
$212.00
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KF25 1 Flat 3 7.5 5
QF25XASA7
$248.00
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KF25 1 Grooved 3 7.5 5
QF25XASA7G
$284.00
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KF25 1 Flat 4 9 9
QF25XASA9
$263.00
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KF25 1 Grooved 4 9 9
QF25XASA9G
$299.00
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KF40 1.5 Flat 6 11 19
QF40XASA11
$371.00
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KF40 1.5 Grooved 6 11 19
QF40XASA11G
$423.00
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KF40 1.5 Flat 1.5 5 3
QF40XASA5
$186.00
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KF40 1.5 Grooved 1.5 5 3
QF40XASA5G
$206.00
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KF40 1.5 Flat 2 6 3
QF40XASA6
$196.00
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KF40 1.5 Grooved 2 6 3
QF40XASA6G
$217.00
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KF40 1.5 Flat 3 7.5 5
QF40XASA7
$258.00
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KF40 1.5 Grooved 3 7.5 5
QF40XASA7G
$294.00
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KF40 1.5 Flat 4 9 9
QF40XASA9
$268.00
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KF40 1.5 Grooved 4 9 9
QF40XASA9G
$304.00
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KF50 2 Flat 6 11 19
QF50XASA11
$382.00
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KF50 2 Grooved 6 11 19
QF50XASA11G
$433.00
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KF50 2 Flat 1.5 5 3
QF50XASA5
$191.00
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KF50 2 Grooved 1.5 5 3
QF50XASA5G
$212.00
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KF50 2 Flat 2 6 3
QF50XASA6
$201.00
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KF50 2 Grooved 2 6 3
QF50XASA6G
$222.00
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KF50 2 Flat 3 7.5 5
QF50XASA7
$263.00
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KF50 2 Grooved 3 7.5 5
QF50XASA7G
$299.00
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KF50 2 Flat 4 9 9
QF50XASA9
$273.00
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KF50 2 Grooved 4 9 9
QF50XASA9G
$309.00
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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
Bolt Sets, 9/16—12 x 1.50"
Size 1 ASA & 1.5 ASA Flanges
4
3/4 (0.34)
--
HBS563121504
$12.40
N/A
Bolt Sets, 5/8—11 x 1.75"
Size 2 ASA & 3 ASA Flanges
4
1 (0.45)
--
HBS625111754
$16.00
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Bolt Sets, 5/8—11 x 1.75"
Size 4 ASA Flanges
8
1-1/2 (0.68)
--
HBS625111758
$29.90
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Bolt Sets, 3/4—10 x 2.50"
Size 6 ASA & 8 ASA Flanges
8
2 (0.91)
--
HBS751025008
$47.00
(please log in)
Bolt Sets, 3/4—10 x 2.50"
Size 10 ASA Flanges
12
2-1/2 (1.13)
--
HBS751025012
$70.00
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O-Rings (Fluorocarbon)
Size 1 ASA Flanges
1
1/4 (0.11)
--
O-V223
$21.20
(please log in)
O-Rings (Fluorocarbon)
Size 1.5 ASA Flanges
1
1/4 (0.11)
--
O-V231
$8.50
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O-Rings (Fluorocarbon)
Size 2 ASA Flanges
1
1/4 (0.11)
--
O-V238
$21.70
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O-Rings (Fluorocarbon)
Size 3 ASA Flanges
1
1/4 (0.11)
--
O-V247
$21.70
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O-Rings (Fluorocarbon)
Size 4 ASA Flanges
1
1/4 (0.11)
--
O-V258
$34.00
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O-Rings (Fluorocarbon)
Size 6 ASA Flanges
1
1/4 (0.11)
--
O-V266
$23.70
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O-Rings (Fluorocarbon)
Size 8 ASA Flanges
1
1/4 (0.11)
--
O-V274
$21.70
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O-Rings (Fluorocarbon)
Size 10 ASA Flanges
1
1/4 (0.11)
--
O-V278
$24.80
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Molded O-Rings (Buna-N2)
Size 4 ASA Flanges
1
1/4 (0.11)
--
VR701GL40B
P.O.R.
N/A
Cast Clamps (SS)
KF10, KF16 Flanges
1
3/4 (0.34)
--
QF16-075-CS
$46.00
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Cast Clamps (SS)
KF25 Flanges
1
1 (0.45)
--
QF25-100-CS
$57.00
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Cast Clamps (SS)
KF40 Flanges
1
1-1/2 (0.68)
--
QF40-150-CS
$67.00
(please log in)
Cast Clamps (SS)
KF50 Flanges
1
2 (0.91)
--
QF50-200-CS
$79.00
(please log in)
Lever Clamps (Aluminum)
KF10, KF16 Flanges
1
1/2 (0.22)
--
QF16-075-CHA
$33.00
N/A
Lever Clamps (Aluminum)
KF25 Flanges
1
3/4 (0.34)
--
QF25-100-CHA
$46.00
N/A
Lever Clamps (Aluminum)
KF40 Flanges
1
3/4 (0.34)
--
QF40-150-CHA
$54.00
N/A
Centering Ring (SS with Fluorocarbon O-Ring)
KF10 Flanges
1
1/4 (0.11)
--
QF10-050-SRV
$6.40
(please log in)
Centering Ring (SS with Fluorocarbon O-Ring)
KF16 Flanges
1
1/4 (0.11)
--
QF16-075-SRV
$6.70
(please log in)
Centering Ring (SS with Fluorocarbon O-Ring)
KF25 Flanges
1
1/4 (0.11)
--
QF25-100-SRV
$8.50
(please log in)
Centering Ring (SS with Fluorocarbon O-Ring)
KF40 Flanges
1
1/4 (0.11)
--
QF40-150-SRV
$13.00
(please log in)
Centering Ring (SS with Fluorocarbon O-Ring)
KF50 Flanges
1
1/4 (0.11)
--
QF50-200-SRV
$15.00
(please log in)

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