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KF (QF) to Welch Pump Adapters

Flange to port adapters allow the mating of a KF (QF) flange to a particular type of port or tubulation. All of our flange to port adapters are manufactured from 304 series stainless steel (unless otherwise noted).

Flange to Port Adapter Types:

  • KF to 1" Baseplate Port -- Adapter fits through a 1" diameter hole in a baseplate or chamber wall used for connecting a roughing pump or other KF flanged component to the chamber.
  • KF to Hose Tubulation -- Available in either stainless steel or aluminum, they connect a KF flange to a plastic or rubber vacuum hose
  • KF to Test Port -- KF flange terminating in a tube with an O.D. that fits either a 1-1/8" or 2" O.D. test port
  • KF to Welch Pump Port -- Substitutes for the regular intake hose coupling on the pump. Threads into the pump inlet, enabling direct connection to the foreline by the KF flange.
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To contact someone directly, please click here, or call +1 412 387 9200 to get in contact with your dedicated sales team.
Note:
  • Welch pump port adapters are available in both new style (oil sight glass pressed into pump body) and old style (oil sight glass held in place with a bolt ring) due to pump design changes by the manufacturer. Please pay careful attention when ordering.

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Ordering Table

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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
VacuCADSM
Part Number Price In Stock Add Item
Description For Per Package
VacuCADSM
Part Number Price In Stock Add Item
Cast Clamps (SS) KF10, KF16 Flanges 1
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QF16-075-CS
$46.25 In Stock
Cast Clamps (SS) KF25 Flanges 1
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QF25-100-CS
$57.30 In Stock
Cast Clamps (SS) KF40 Flanges 1
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QF40-150-CS
$67.35 In Stock
Cast Clamps (SS) KF50 Flanges 1
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QF50-200-CS
$79.40 In Stock
Lever Clamps (Aluminum) KF10, KF16 Flanges 1
N/A
QF16-075-CHA
$33.20 In Stock
Lever Clamps (Aluminum) KF25 Flanges 1
N/A
QF25-100-CHA
$46.35 In Stock
Lever Clamps (Aluminum) KF40 Flanges 1
N/A
QF40-150-CHA
$54.72 In Stock
Centering Ring (SS with Fluorocarbon O-Ring) KF10 Flanges 1
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QF10-050-SRV
$6.45 In Stock
Centering Ring (SS with Fluorocarbon O-Ring) KF16 Flanges 1
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QF16-075-SRV
$6.75 In Stock
Centering Ring (SS with Fluorocarbon O-Ring) KF25 Flanges 1
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QF25-100-SRV
$8.55 In Stock
Centering Ring (SS with Fluorocarbon O-Ring) KF40 Flanges 1
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QF40-150-SRV
$13.10 In Stock
Centering Ring (SS with Fluorocarbon O-Ring) KF50 Flanges 1
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QF50-200-SRV
$15.10 In Stock
How to Combine Click the checkboxes of the parts you would like to purchase and then click the button below to add all parts selected into your Cart.
Contact Us - KF (QF) to Welch Pump Adapters