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The double ferrule fitting on Thorlabs' Herriott Cells (left) can be replaced with the KF16G25E vacuum flange adapter (right). Note that the leakage rate of the Herriott Cell is not guaranteed if the gas fitting is replaced or adjusted by the user.

• Connect KF-Compatible Vacuum Systems to BSPP Components
• 304 Stainless Steel Construction for High Durability and Low Outgassing
• External Flats Accept 14 mm (9/16") Wrench

The KF16 Flange to G1/4" External Threading Adapter allows vacuum systems to be connected to British Standard Pipe Parallel (BSPP) components. The interior diameter of our adapter is Ø9.0 mm (Ø0.35"). The included rubber gasket is pre-installed onto the part; removing the gasket is not recommended, as it may become damaged. The exterior flats for tightening accept a 14 mm (9/16") wrench. Each flange is shipped with a protective plastic cover.

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KF16PC25 adapter shown with double ferrule compression fittings. The ferrules and compressing nut are not included with the KF16PC25 or KF16PC6/M.

• Quickly Connect KF-Compatible Vacuum Systems to Double Ferrule Compression Fittings
• 304 Stainless Steel Construction for High Durability and Low Outgassing
• Hex Accepts 9/16" (14 mm) Wrench 

This adapter allows KF16 vacuum systems to be connected to double ferrule compression fittings, making them compatible with Swagelok^®-brand fittings. The image to the right shows how the KF16PC25 adapter interfaces with compression fittings; note the front ferrule, back ferrule, and nut are not included in the purchase of a double ferrule compression adapter. The KF16PC25(/M) adapter accepts Ø1/4" (Ø6 mm) metal tubesa and the hex on the adapter accepts 9/16" (14 mm) wrenches. Each flange is shipped with a protective plastic cover.

• Quickly Connect Glass and Metal Pipes to KF-Compatible Vacuum Systems
• Options for Pipe Outer Diameters (OD) of 1/4", 3/8", or 1/2"
• 304 Stainless Steel Construction for High Durability and Low Outgassing
• Internal Viton^® Fluoroelastomer O-Ring Included

KF25 flanges with compression fittings mount smooth-surfaced pipes to vacuum systems, including metal tubes, such as those used for gas lines, or glass tubes like those found on our empty glass cells. Each fitting contains an internal Viton fluoroelastomer O-ring. When the knurled cap of the fitting is hand tightened, the O-ring compresses and forms a seal around the inserted pipe. For best results, a thin layer of vacuum grease should be applied to the internal O-ring; along with helping to create a vacuum seal, this grease allows an inserted pipe to slide along the O-ring without catching and causing damage. The knurled cap should not be overtightened, as excessive force could cause O-ring buckling, leading to leaks. The sizes of the internal O-rings are given in the table above. Each flange is shipped with a protective plastic cover.

Viton is a registered trademark of The Chemours Company.

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KF25E90 Elbow Pipe Dimensions

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KF25E45 Elbow Pipe Dimensions

• 45° or 90° Angled Pipe Joints for KF25 Vacuum Systems
• 304 Stainless Steel Construction for High Durability and Low Outgassing

These angled elbow pipes have KF25 flanges and allow for turns when assembling vacuum systems. Details on each pipe can be found by clicking on the diagrams to the right. Each flange is protected with a plastic cover during shipping.

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This attenuation data was calculated as a function of wavelength for the fibers used in the UHV high-OH fiber feedthrough KF40 flanges.

• Construction Enables use at Vacuum Pressures Down to 1 x 10^-8 Torr
• Mates to KF40 (Ø2.17") Flanges
• Hermetically Sealed Multimode Step-Index Fiber
  • Ø100 µm, Ø200 µm, Ø400 µm, or Ø600 µm Core
  • High OH (200 - 1200 nm)
• 304 Stainless Steel Construction for High Durability and Low Outgassing
• Laser Welded Body; Adhesive-Free on Vacuum Side
• Bake-Out can be Conducted Up to 250 °C 
• KF40 Flange-Centering O-Ring Carrier and Wing Nut Clamp Sold Below

Our Ultra-High-Vacuum-Compatible High-OH Fiber Feedthrough KF40 Flanges allow for optical coupling into ultra-high-vacuum (UHV) systems using SMA905-terminated fiber patch cables and mating sleeves. Constructed using 304 stainless steel, every feedthrough is designed to be used within UHV systems down to 10^-8 Torr. All materials meet the NASA outgassing standard ASTM E 595-77-84-90. Each feedthrough incorporates a hermetically sealed 0.22 NA step-index multimode optical fiber in a stainless steel shell, provides a low insertion loss of ≤2.3 dB, and can handle optical powers up to 1 W. The flanges are double vacuum bagged to help prevent contamination when transported into a cleanroom environment.

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Ultra-High Vacuum Fiber Feedthrough KF40 Flange Cross-Section

The fiber feedthroughs feature male SMA905 connectors on both sides; mating sleeves may be used to connect fiber patch cables. For the side of the feedthrough that is inside of the vacuum environment, the ADASMAV vacuum-compatible SMA-to-SMA mating sleeve can be used to connect a vacuum-compatible patch cable.  

The laser-welded joints of these flanges provide sturdier construction than traditional adhesives and greatly minimize leak rate. In addition, the locations of these laser welds and the hermetic glass-to-metal seal ensure that only external, easy-to-clean surfaces are directly exposed to the vacuum. Since there is no epoxy on the vacuum side of the feedthrough, there is minimal contamination and gas load on the vacuum system.

These KF flanges are ISO-standardized vacuum fittings that can be mated to a vacuum system using a wing nut clamp and an O-ring carrier (sold below). The angled sides of the wing nut clamp compress the O-ring between the flanges, quickly creating a vacuum seal. The wing nut clamp, which has M5 x 0.8 threads, requires only hand tightening, allowing parts to be quickly swapped in and out of a KF-flanged system. Please note that the O-ring carrier and wing nut clamp must be purchased separately. 

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Click for Data
This attenuation data was calculated as a function of wavelength for the fiber used in the MIR fiber feedthrough KF40 flange.

• Construction Enables use at Vacuum Pressures Down to 1 x 10^-8 Torr
• Mates to KF40 (Ø2.17") Flanges
• Hermetically Sealed Multimode Step-Index Fiber
  • Ø100 µm Core
  • InF₃ MIR (0.3 - 5.5 µm)
• 304 Stainless Steel Construction for High Durability and Low Outgassing
• Bake-Out can be Conducted Up to 90 °C
• KF40 Flange-Centering O-Ring Carrier and Wing Nut Clamp Sold Below

Our Ultra-High-Vacuum-Compatible MIR Fiber Feedthrough KF40 Flange allows for optical coupling into ultra-high-vacuum (UHV) systems using SMA905-terminated fiber patch cables and mating sleeves. Constructed using 304 stainless steel, every feedthrough is designed to be used within UHV systems down to 10^-8 Torr. All materials meet the NASA outgassing standard ASTM E 595-77-84-90. Each feedthrough incorporates a hermetically sealed 0.26 NA step-index multimode optical fiber in a stainless steel shell, provides a low insertion loss of ≤2.3 dB, and can handle optical powers up to 1 W. The flanges are double vacuum bagged to help prevent contamination when transported into a cleanroom environment.

The fiber feedthrough features a male SMA905 connector on the vacuum-facing side and 17.78" (451.6 mm) long, ruggedized, hermetic, permanently attached, InF₃ multimode fiber cable ending in a male SMA905 connector on the other. The ruggedized cable on the non-vacuum side provides additional length and allows direct connection to more devices, minimizing insertion loss. Note that this fiber cable cannot be removed.

This KF flange is a ISO-standardized vacuum fitting that can be mated to a vacuum system using a wing nut clamp and an O-ring carrier (sold below). The angled sides of the wing nut clamp compress the O-ring between the flanges, quickly creating a vacuum seal. The wing nut clamp, which has M5 x 0.8 threads, requires only hand tightening, allowing parts to be quickly swapped in and out of a KF-flanged system. Please note that the O-ring carrier and wing nut clamp must be purchased separately. 

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Click for Data
This attenuation data was calculated as a function of wavelength for the fibers used in the UHV low-OH fiber feedthrough KF40 flanges.

• Construction Enables use at Vacuum Pressures Down to 1 x 10^-8 Torr
• Mates to KF40 (Ø2.17") Flanges
• Hermetically Sealed Multimode Step-Index Fiber
  • Ø100 µm, Ø200 µm, Ø400 µm, or Ø600 µm Core
  • Low OH (400 - 2400 nm)
• 304 Stainless Steel Construction for High Durability and Low Outgassing
• Laser Welded Body; Adhesive-Free on Vacuum Side
• Bake-Out can be Conducted Up to 250 °C
• KF40 Flange-Centering O-Ring Carrier and Wing Nut Clamp Sold Below

Our Ultra-High-Vacuum-Compatible Low-OH Fiber Feedthrough KF40 Flanges allow for optical coupling into ultra-high-vacuum (UHV) systems using SMA905-terminated fiber patch cables and mating sleeves. Constructed using 304 stainless steel, every feedthrough is designed to be used within UHV systems down to 10^-8 Torr. All materials meet the NASA outgassing standard ASTM E 595-77-84-90. Each feedthrough incorporates a hermetically sealed 0.22 NA step-index multimode optical fiber in a stainless steel shell, provides a low insertion loss of ≤2.3 dB, and can handle optical powers up to 1 W. The flanges are double vacuum bagged to help prevent contamination when transported into a cleanroom environment.

Click to Enlarge
Ultra-High Vacuum Fiber Feedthrough KF40 Flange Cross-Section

The fiber feedthroughs feature male SMA905 connectors on both sides; mating sleeves may be used to connect fiber patch cables. For the side of the feedthrough that is inside of the vacuum environment, the ADASMAV vacuum-compatible SMA-to-SMA mating sleeve can be used to connect a vacuum-compatible patch cable.  

The laser-welded joints of these flanges provide sturdier construction than traditional adhesives and greatly minimize leak rate. In addition, the locations of these laser welds and the hermetic glass-to-metal seal ensure that only external, easy-to-clean surfaces are directly exposed to the vacuum. Since there is no epoxy on the vacuum side of the feedthrough, there is minimal contamination and gas load on the vacuum system.

These KF flanges are ISO-standardized vacuum fittings that can be mated to a vacuum system using a wing nut clamp and an O-ring carrier (sold below). The angled sides of the wing nut clamp compress the O-ring between the flanges, quickly creating a vacuum seal. The wing nut clamp, which has M5 x 0.8 threads, requires only hand tightening, allowing parts to be quickly swapped in and out of a KF-flanged system. Please note that the O-ring carrier and wing nut clamp must be purchased separately. 

• Clamp KF-Flanged Components
• Fast Hand Tightening; No Tools Required
• For KF16, KF25, or KF40 Flange Sizes

Wing nut fastening clamps fit around an assembly of two KF flanges separated by an O-ring. The angled sides of the clamp compress the O-ring between the flanges, quickly creating a vacuum seal. These components only require hand tightening the wing nut (M5 x 0.8), without the need for additional tools, allowing parts to be quickly swapped in and out of a KF-flanged system.

Be aware that under vacuum pressure, the KF connection may undergo additional compression, causing the wing nut clamp to loosen. Some additional tightening may be performed, but be careful not to overtighten the clamp, as the wing nut may become difficult to remove or jammed when the system returns to atmospheric pressure. Do not remove a wing nut clamp while a system is under vacuum.

• Holds O-Ring in Place Between KF Flanges
• Creates Vacuum Seal When Compressed Against KF Mating Surfaces
• Includes Fluorocarbon O-Ring
• For KF16, KF25, or KF40 Flange Sizes

O-ring carriers keep O-rings centered between KF flange components during the clamping process. Carriers are available in KF16, KF25, and KF40 sizes; each include a single fluorocarbon O-ring sized appropriately for the corresponding flange size.

For best performance, a very thin coating of vacuum grease should be applied to the O-ring before installation. This should be done by hand while wearing gloves, leaving just enough grease to cause the O-ring to shine. The O-ring and its mating surfaces should be visually inspected before installation to ensure there is no debris which may impede proper contact and cause a leak. O-rings should be regularly inspected to spot dry rot, cracking, tearing, or accumulation of debris from normal operation. Replace any O-ring that is suspected of causing a leak.

• 304 Stainless Steel Construction for High Durability and Low Outgassing
• Blocks Unused Vacuum Ports
• KF16, KF25, and KF40 Flange Sizes

Stainless steel KF flange blank caps can be used to protect a vacuum assembly that is not attached to a vacuum system, to block a port during leak testing, or to cap off a port that is not being used on a vacuum chamber body. Each cap is shipped with a protective plastic cover.