KF Vacuum Flange KF40FBWL
KF vacuum flanges, also called NW or QF, are quick-connect flanges for low-to-medium vacuum. K stands for German Kleinflansch, meaning small flange. Designed for rapid connection/disassembly, they suit laboratories and industry requiring frequent configuration changes or cleaning. 1. Flanges: generally two mating KF parts. 2. Seal: an annular rubber seal or O-ring maintains sealing between flanges. 3. Clamp: secures flanges and compresses the seal, generally using one or several bolts/nuts for quick tightening/release. 4. Centering ring: some connections include one to position the seal correctly. Simple, relatively inexpensive KF systems are practical in research and industry, particularly maintenance-/cost-sensitive settings, joining pipes, pumps, chambers, and other vacuum equipment. CF (Conflat Flange) generally serves higher vacuum, up to 10^-12 mbar. Static metal sealing withstands higher temperatures and high-temperature bakeout. CF uses bolts/nuts, while KF quick clamps make connection/removal more convenient. Overall, KF offers simple, economical quick connections for general vacuum; CF is more common for high vacuum or high-temperature operation. Selection considers vacuum, temperature, and disassembly frequency.
Save to Favorites
Overview
Specifications
| Parameter | Value |
|---|---|
| Nominal Bore | KF40 |
| φA | 55 |
| φB | 41.2 |
| φC | 34.8 |
| φD | 38.1 |
Datasheet
Please provide your email to download the datasheet.
Invalid email format. Please try again.
Supplier Information
Related Products
-
Flow Cell Optical Cells Sjllaser
-
Quartz Cuvette Optical Cells Lbjx-trigon-optics
-
CF Vacuum Flange CF16 Optical Cells Fiberock
Flange Outer Diameter: 34.00 mm Flange Thickness: 7.30 mm Bolt Circle Diameter: 27.00 mm
CF, or Conflat Flange, is a high-vacuum connection using static metal seals and capable of high-temperature bakeout2. Pressure ranges from a minimum <10-12 hPa to ambient. Nominal diameters include 16, 40, 63, 100, 160, 200, 2502. Applicable vacuum reaches 10^-12 mbar2. Seal materials are generally Viton, PTFE, or oxygen-free copper; flanges generally use 304 or 316 stainless steel. Fixed flanges are one-piece. Loose/rotatable flanges comprise a knife edge compressing copper gaskets and a bolt-retaining section. Through-holes require bolts and nuts; threaded holes accept bolts directly. Main materials are SUS304 or SUS304L because SUS304 outgasses little and is readily machined/welded. Installation is demanding. Copper gaskets deform under compression, so tighten bolts evenly. Uneven forces lift diagonally opposite flange areas and cause leakage. Approximate torques: M4: 20kgf·cm; M6: 70kgf·cm; M8: 100kgf·cm. Genderless CF flanges and copper gaskets are all metal and withstand bakeout above 250℃. Disadvantages are high cost and nonreusable copper gaskets. CF series: readily recognizable seals mainly serve ultrahigh vacuum, using copper-gasket metal sealing. After one use, gasket sealing deteriorates substantially; high-vacuum systems require gasket replacement after every disassembly. Standard sizes such as CF35 and matching standard copper gaskets are available.
-
CF Vacuum Flange CF25 Optical Cells Fiberock
Flange Outer Diameter: 54.00 mm Flange Thickness: 10.50 mm Bolt Circle Diameter: 43.00 mm
CF, or Conflat Flange, is a high-vacuum connection using static metal seals and capable of high-temperature bakeout2. Pressure ranges from a minimum <10-12 hPa to ambient. Nominal diameters include 16, 40, 63, 100, 160, 200, 2502. Applicable vacuum reaches 10^-12 mbar2. Seal materials are generally Viton, PTFE, or oxygen-free copper; flanges generally use 304 or 316 stainless steel. Fixed flanges are one-piece. Loose/rotatable flanges comprise a knife edge compressing copper gaskets and a bolt-retaining section. Through-holes require bolts and nuts; threaded holes accept bolts directly. Main materials are SUS304 or SUS304L because SUS304 outgasses little and is readily machined/welded. Installation is demanding. Copper gaskets deform under compression, so tighten bolts evenly. Uneven forces lift diagonally opposite flange areas and cause leakage. Approximate torques: M4: 20kgf·cm; M6: 70kgf·cm; M8: 100kgf·cm. Genderless CF flanges and copper gaskets are all metal and withstand bakeout above 250℃. Disadvantages are high cost and nonreusable copper gaskets. CF series: readily recognizable seals mainly serve ultrahigh vacuum, using copper-gasket metal sealing. After one use, gasket sealing deteriorates substantially; high-vacuum systems require gasket replacement after every disassembly. Standard sizes such as CF35 and matching standard copper gaskets are available.
-
CF Vacuum Flange CF35 Optical Cells Fiberock
Flange Outer Diameter: 70.00 mm Flange Thickness: 13.00 mm Bolt Circle Diameter: 58.70 mm
CF, or Conflat Flange, is a high-vacuum connection using static metal seals and capable of high-temperature bakeout2. Pressure ranges from a minimum <10-12 hPa to ambient. Nominal diameters include 16, 40, 63, 100, 160, 200, 2502. Applicable vacuum reaches 10^-12 mbar2. Seal materials are generally Viton, PTFE, or oxygen-free copper; flanges generally use 304 or 316 stainless steel. Fixed flanges are one-piece. Loose/rotatable flanges comprise a knife edge compressing copper gaskets and a bolt-retaining section. Through-holes require bolts and nuts; threaded holes accept bolts directly. Main materials are SUS304 or SUS304L because SUS304 outgasses little and is readily machined/welded. Installation is demanding. Copper gaskets deform under compression, so tighten bolts evenly. Uneven forces lift diagonally opposite flange areas and cause leakage. Approximate torques: M4: 20kgf·cm; M6: 70kgf·cm; M8: 100kgf·cm. Genderless CF flanges and copper gaskets are all metal and withstand bakeout above 250℃. Disadvantages are high cost and nonreusable copper gaskets. CF series: readily recognizable seals mainly serve ultrahigh vacuum, using copper-gasket metal sealing. After one use, gasket sealing deteriorates substantially; high-vacuum systems require gasket replacement after every disassembly. Standard sizes such as CF35 and matching standard copper gaskets are available.
Related Articles
Macro channel water-cooled stacked laser diodes integrate dozens of laser bars into one vertical stacked module with large-diameter macro flow cooling channels.
The CNGE 384 uncooled infrared core module is a high-performance core component for thermal imaging systems. Adopting mature uncooled infrared detection technology, it realizes all-weather thermal radiation perception and high-definition imaging without refrigeration equipment.
VCSEL, short for Vertical Cavity Surface Emitting Laser, is a widely used semiconductor laser component in modern optoelectronics. Unlike traditional edge-emitting lasers, VCSEL emits laser light vertically from its chip surface. Thanks to its low power consumption, stable beam quality, low cost, and easy integration, it has become the core light source for 3D sensing, wearable devices, and high-speed optical communication.
Founded in Beijing in 2011, Beijing FJR Opto-electronic Technology Co., Ltd. specializes in R&D, manufacturing and sales of infrared thermal imaging equipment and complete optoelectronic systems.
Loading...
Name
Phone
Organization
Use Case
Database Platform