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

KF (QF) to Male NPT Adapters

Flange to NPT fitting adapters allow the mating of one type of flange system to an NPT fitting. All of our flange to fitting adapters are manufactured from 304 series stainless steel (unless otherwise noted).

Flange to NPT Adapter Types:

  • CF to NPT Female: Zero length style (center-bored CF flange)
  • KF to NPT Male:
    • Flanged stubs terminating in a tapered thread
    • 304 stainless steel
  • KF to NPT Female:
    • Suitable for insertion of an NPT threaded (male) pressure gauge or UTA valve into a foreline.
    • Available in 304 stainless steel, brass and aluminum.

NOTE: Use PTFE tape for sealing threaded joints.

Dimensional Drawings

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Ordering Table

(Click column headers to sort data)

Flange
Size/OD
Bore Dim
A
Fitting Weight
lbs
PartNo Price Add Item
VacuCADSM
Flange
Size/OD
Bore Dim
A
Fitting Weight
lbs
PartNo Price Add Item
VacuCADSM
KF16 0.26 1.57 1/8" Male NPT 0.25
QF16XMNPT2
$49.00
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KF16 0.36 2.5 1/4" Male NPT 0.25
QF16XMNPT4
$50.00
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KF16 0.5 2.5 3/8" Male NPT 0.25
QF16XMNPT6
P.O.R.
N/A
KF16 0.62 2.95 1/2" Male NPT 0.25
QF16XMNPT8
P.O.R.
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KF25 0.26 1.57 1/8" Male NPT 0.25
QF25XMNPT2
$51.00
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KF25 0.36 1.97 1/4" Male NPT 0.25
QF25XMNPT4
$56.00
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KF25 0.5 1.57 3/8" Male NPT 0.25
QF25XMNPT6
P.O.R.
N/A
KF25 0.63 2.95 1/2" Male NPT 0.25
QF25XMNPT8
$66.00
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KF25 0.83 2.95 3/4" Male NPT 0.25
QF25XMNPT12
$73.00
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KF25 1.05 3 1" Male NPT 0.25
QF25XMNPT16
$106.00
N/A
KF40 0.26 1.57 1/8" Male NPT 0.25
QF40XMNPT2
$56.00
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KF40 0.36 1.97 1/4" Male NPT 0.25
QF40XMNPT4
$57.00
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KF40 0.63 2.95 1/2" Male NPT 0.25
QF40XMNPT8
$68.00
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KF40 0.83 2.95 3/4" Male NPT 0.25
QF40XMNPT12
$88.00
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KF40 1.05 2.95 1" Male NPT 0.25
QF40XMNPT16
$109.00
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KF40 1.38 2.95 1-1/4” Male NPT 0.25
QF40XMNPT20
$191.00
N/A
KF40 1.61 3.25 1-1/2” Male NPT 0.25
QF40XMNPT24
$101.00
N/A
KF50 0.26 1.57 1/8" Male NPT 0.25
QF50XMNPT2
P.O.R.
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KF50 0.36 1.97 1/4" Male NPT 0.25
QF50XMNPT4
$73.00
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KF50 0.63 2.95 1/2" Male NPT 0.25
QF50XMNPT8
$70.00
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KF50 0.83 2.95 3/4" Male NPT 0.25
QF50XMNPT12
$139.00
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KF50 1.05 2.95 1" Male NPT 0.25
QF50XMNPT16
$101.00
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KF50 2.07 3.12 2” Male NPT 0.25
QF50XMNPT32
P.O.R.
N/A
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 (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
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Cast Clamps (SS)
KF50 Flanges
1
2 (0.91)
--
QF50-200-CS
$79.00
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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
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Centering Ring (SS with Fluorocarbon O-Ring)
KF16 Flanges
1
1/4 (0.11)
--
QF16-075-SRV
$6.70
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Centering Ring (SS with Fluorocarbon O-Ring)
KF25 Flanges
1
1/4 (0.11)
--
QF25-100-SRV
$8.50
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Centering Ring (SS with Fluorocarbon O-Ring)
KF40 Flanges
1
1/4 (0.11)
--
QF40-150-SRV
$13.00
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Centering Ring (SS with Fluorocarbon O-Ring)
KF50 Flanges
1
1/4 (0.11)
--
QF50-200-SRV
$15.00
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