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Flanges & Components > KF (QF) Flanges & Components > Bored KF(QF) Flanges (304L SS)

Bored KF (QF) Stainless Steel Flanges (Inch Tube)

The KF (QF) flange is used for through- or foreline vacuum plumbing and for simple HV chamber ports.

KF flanges are a sexless design—made from 304L stainless, aluminum, or brass. Stainless steel flanges work in adverse temperatures and corrosive conditions, while aluminum or brass fittings work in more general applications. The seal is a rubber/ elastomeric o-ring mounted in a centering ring, which aligns the flanges and holds the o-ring in position. Each flange has a chamfered back-surface and is mated by a circumferential clamp tightened by wing-nut, thumbscrew, bolt, or over-center lever.

KF flanges are limited (by the o-ring's properties) to applications with temperatures between ~0° C and 120–180° C, and pressure from atmosphere to ~10-8 torr or mbar.

NOTE: These flanges are identical to the ISO NW flange standard. While these flanges are compatible with those made by European manufacturers, the tube diameter listed is in inches.

ISO Standard Our KF Flanges are compatible to the ISO Standard 2861 Specification.

Dimensional Drawings

Got VacuCADSM?
VacuCAD is a free library containing thousands of 2D CAD drawings (in DXF format) and 3D Models (in STP format) for many of our standard vacuum components and chambers. Please Log in

Ordering Table

(Click column headers to sort data)

Flange
Size/OD
Bore Dim
A
Dim
B
Dim
C
Weight
lbs
PartNo Price Add Item
VacuCADSM
Flange
Size/OD
Bore Dim
A
Dim
B
Dim
C
Weight
lbs
PartNo Price Add Item
VacuCADSM
KF10 0.26 0.26 0.255 n/a 0.25
QF10-025-SBB
$9.60
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KF10 0.51 0.51 0.451 0.5 0.25
QF10-050-SBB
$9.60
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KF16 0.26 0.26 0.255 n/a 0.25
QF16-025-SBB
$8.50
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KF16 0.38 0.38 0.38 0.15 0.25
QF16-037-SBB
$8.50
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KF16 0.51 0.51 0.451 0.16 0.25
QF16-050-SBB
$9.60
(please log in)
KF16 0.76 0.76 0.685 0.14 0.25
QF16-075-SBB
$9.60
(please log in)
KF25 0.26 0.26 0.255 n/a 0.25
QF25-025-SBB
$9.60
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KF25 0.38 0.38 0.38 n/a 0.25
QF25-037-SBB
$9.60
(please log in)
KF25 0.51 0.51 0.375 0.12 0.25
QF25-050-SBB
$10.70
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KF25 0.76 0.76 0.715 0.12 0.25
QF25-075-SBB
$9.60
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KF25 1.01 1.01 0.935 0.15 0.25
QF25-100-SBB
$10.70
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KF40 0.26 0.26 0.255 n/a 0.25
QF40-025-SBB
$13.40
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KF40 0.38 0.38 0.38 n/a 0.25
QF40-037-SBB
$13.40
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KF40 0.51 0.51 0.466 0.12 0.25
QF40-050-SBB
$13.40
(please log in)
KF40 0.76 0.76 0.715 0.12 0.25
QF40-075-SBB
$13.40
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KF40 1.01 1.01 0.935 0.12 0.25
QF40-100-SBB
$13.40
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KF40 1.51 1.51 1.435 0.15 0.25
QF40-150-SBB
$15.00
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KF50 0.26 0.26 0.255 n/a 0.25
QF50-025-SBB
$18.20
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KF50 0.51 0.51 0.505 n/a 0.25
QF50-050-SBB
$18.20
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KF50 0.76 0.76 0.715 0.12 0.25
QF50-075-SBB
$18.10
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KF50 1.01 1.01 0.935 0.12 0.25
QF50-100-SBB
$18.20
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KF50 1.51 1.51 1.435 0.12 0.25
QF50-150-SBB
$18.20
(please log in)
KF50 2.01 2.01 1.935 0.15 0.25
QF50-200-SBB
$21.70
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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
Cast Clamps (Aluminum)
KF10, KF16 Flanges
1
1/2 (0.22)
--
QF16-075-C
P.O.R.
(please log in)
Cast Clamps (SS)
KF10, KF16 Flanges
1
3/4 (0.34)
--
QF16-075-CS
$46.00
(please log in)
Cast Clamps (Aluminum)
KF25 Flanges
1
1/2 (0.22)
--
QF25-100-C
P.O.R.
(please log in)
Cast Clamps (SS)
KF25 Flanges
1
1 (0.45)
--
QF25-100-CS
$57.00
(please log in)
Cast Clamps (Aluminum)
KF40 Flanges
1
3/4 (0.34)
--
QF40-150-C
P.O.R.
(please log in)
Cast Clamps (SS)
KF40 Flanges
1
1-1/2 (0.68)
--
QF40-150-CS
$67.00
(please log in)
Cast Clamps (Aluminum)
KF50 Flanges
1
3/4 (0.34)
--
QF50-200-C
P.O.R.
(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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