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Rotatable-Bored 304L SS Standard ConFlat® (CF) UHV Flanges

Overview of ConFlat Flanges

The CF (ConFlat) flange is the premier choice for high vacuum (HV) and ultra-high vacuum (UHV) applications, offering a reliable solution for a wide array of gauges, instruments, accessories, and feedthroughs. Its versatility and robustness make it essential in various vacuum systems.

Blank (Blind) Flanges

A blank, or blind flange, is a solid, disc-shaped fitting used in vacuum systems. This type of flange can be machined for a custom fit or to seal off unused sections of tubing or ports in vacuum chambers, ensuring effective containment.

Seal Mechanism

The CF flange’s sealing mechanism features a knife-edge that is precisely machined below the flat surface of the flange. When the bolts of a flange pair are tightened, these knife-edges create annular grooves on either side of a soft metal gasket. The extruded metal effectively fills any machining marks and surface imperfections, resulting in a leak-tight seal. The CF seal operates efficiently across a pressure range from 760 torr (103 mbar) to less than 1 x 10^-13 Torr (approximately 1.3 x 10^-13 mbar), and it functions within a temperature range of -196°C to 450°C, depending on the materials used.

In North America, flange sizes are typically referenced by their outside diameter (O.D.), while in Europe and much of Asia, the nominal internal diameter (I.D.) of the largest tube that can be welded to a bored flange is usually used for identification.

Types of ConFlat Flanges

ConFlat flanges come in four main configurations:

  1. Fixed Flange: This one-piece design has a fixed bolt-hole orientation relative to the fitting, ensuring stable alignment during assembly.
  2. Rotatable Flange: Comprised of an inner weld ring and an outer bolt ring, this configuration allows the bolt ring to rotate around the inner weld ring, providing flexibility for alignment adjustments.

Both fixed and rotatable flanges are available with options for through (clearance) holes or tapped holes, allowing for customization to meet specific application needs.

Through (Clearance) Holes

Are through-holes that allow adequate clearance for bolts to go through both flanges and secured by nuts or plate nuts.

Tapped Holes

Are imperial or metric threaded holes machined through the flange. This allows a clearance-hole flange to be connected without the need for nuts or plate nuts. Be aware of a components bolt hole orientation when selecting tapped flanges.

Ordering Table

Flange Size/OD Type Note Part Number
DN16CF (1.33" OD) Rotatable — F0133X025R
DN16CF (1.33" OD) Rotatable — F0133X037R
DN16CF (1.33" OD) Rotatable — F0133X050R
DN16CF (1.33" OD) Rotatable 1 F0133X075R
DN16CF (1.33" OD) Rotatable Weldneck — F0133X075RW
DN25CF (2.13" OD) Rotatable — F0212X025R
DN25CF (2.13" OD) Rotatable — F0212X050R
DN25CF (2.13" OD) Rotatable — F0212X075R
DN25CF (2.13" OD) Rotatable — F0212X100R
DN35CF-DN40CF (2.75" OD) Rotatable — F0275X025R
DN35CF-DN40CF (2.75" OD) Rotatable — F0275X050R
DN35CF-DN40CF (2.75" OD) Rotatable — F0275X075R
DN35CF-DN40CF (2.75" OD) Rotatable — F0275X100R
DN35CF-DN40CF (2.75" OD) Rotatable — F0275X125R
DN35CF-DN40CF (2.75" OD) Rotatable — F0275X150R
DN35CF-DN40CF (2.75" OD) Rotatable — F0275X162R
DN35CF-DN40CF (2.75" OD) Rotatable — F0275X175R
DN50CF (3.38" OD) Rotatable — F0337X150R
DN50CF (3.38" OD) Rotatable — F0337X200R
DN63CF (4.50" OD) Rotatable — F0450X150R
DN63CF (4.50" OD) Rotatable — F0450X200R
DN63CF (4.50" OD) Rotatable — F0450X250R
DN75CF (4.63" OD) Rotatable — F0462X250R
DN75CF (4.63" OD) Rotatable — F0462X300R
DN100CF (6.00" OD) Rotatable — F0600X400R
DN125CF (6.75" OD) Rotatable — F0675X400R
DN125CF (6.75" OD) Rotatable — F0675X500R
DN160CF (8.00" OD) Rotatable — F0800X600R
DN160CF (8.00" OD) Rotatable — F0800X608R
DN200CF (10.00" OD) Rotatable — F1000X800R
DN250CF (12.00" OD) Rotatable — F1200X1000R
DN275CF (13.25" OD) Rotatable — F1325X1000R
DN275CF (13.25" OD) Rotatable F1325X1075R
DN295CF (14.00" OD) Rotatable — F1400X1200R
DN350CF (16.50" OD) Rotatable — F1650X1400R

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FAQ

Tube fittings are designed for tubes (measured by outside diameter and wall thickness) used in high-pressure and instrumentation applications, whereas pipe fittings are for pipes (identified by nominal pipe size) primarily used in fluid transport.

 

Common valve types include ball valves, gate valves, check valves, butterfly valves, and globe valves. Each serves a specific function—from quick shutoff (ball/gate valves) to flow regulation (globe valves).

 

  • For tubing, measure the outside diameter; for pipes, refer to the nominal pipe size (using conversion charts if needed). Always match the valve or fitting size to your pipe’s dimensions and flow requirements.

  • Frequently used thread types include NPT (National Pipe Tapered), BSP (British Standard Pipe), and UNC, along with slip-fit options that rely on compression or fusion rather than threads.

Interchangeability depends on manufacturer specifications and certification. Always verify compatibility via manufacturer guides or certified interchangeability charts.

 

  • A coupling is a short, straight fitting used to join two pipes or tubes. It provides a secure, leak-tight connection and can sometimes serve to extend or repair piping runs.

Consider valve type, pressure and temperature ratings, material compatibility with your fluid, actuation method (manual or automatic), and maintenance requirements.

 

  • Valves regulate flow by opening, closing, or partially obstructing the pathway. Their mechanisms (such as the rotation of a ball or the linear movement of a gate) determine the speed and precision of flow control.

  • A flange is a flat, circular component used to connect pipes, valves, or other equipment. Bolted together with gaskets, flanges provide a secure, leak-proof joint that facilitates both assembly and maintenance.

  • Manual valves require physical operation via handles or levers, whereas actuated valves use mechanisms—pneumatic, electric, or hydraulic—to open and close automatically or remotely.

  • Issues include leaks caused by improper installation, over-tightening, degraded seals, material incompatibility, and fatigue from repeated cycling. Regular inspection and proper installation practices help mitigate these problems.

Regular maintenance involves periodic inspections, cleaning or replacing worn seals, ensuring proper torque during installation, and adhering to manufacturer guidelines and local plumbing codes to preserve system integrity.

 

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