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Fixed Tapped-Blank (Blind) 304L SS Standard ConFlat® (CF) UHV Flanges

Overview of ConFlat Flanges

The CF (ConFlat) flange is the most commonly utilized option for high vacuum (HV) and ultra-high vacuum (UHV) applications. This flange system supports a variety of gauges, instruments, accessories, and feedthroughs, making it an essential component in many vacuum setups.

Blank (Blind) Flange

A blank or blind flange is a solid, disc-shaped fitting employed in vacuum systems. It can be custom-machined to either create a tailored fitting or to seal off unused sections of tubing or ports on vacuum chambers, ensuring effective containment and integrity.

Seal Mechanism

The sealing mechanism of the CF flange features a knife-edge that is precision-machined below the flange’s flat surface. As the bolts of a flange pair are tightened, these knife-edges form annular grooves on each side of a soft metal gasket. The extruded metal from the gasket fills in any machining marks and surface imperfections, resulting in a leak-tight seal. The CF seal functions effectively within a pressure range of 760 torr (103 mbar) down to less than 1 x 10^-13 Torr (approximately 1.3 x 10^-13 mbar) and can operate across 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.). Conversely, in Europe and much of Asia, the nomenclature usually references the nominal internal diameter (I.D.) of the largest tube that can be welded to a bored flange.

Types of ConFlat Flanges

ConFlat flanges are available in four primary configurations:

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

Both fixed and rotatable flanges come with options for through (clearance) holes or tapped holes, enabling customization to suit specific application requirements.

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 Flange Material Part Number
DN16CF (1.33" OD) Fixed Tapped 304L SS F0133X000NM
DN16CF (1.33" OD) Fixed Tapped 304L SS F0133X000NT
DN25CF (2.13" OD) Fixed Tapped 304L SS F0212X000NT
DN35CF-DN40CF (2.75" OD) Fixed Tapped 304L SS F0275X000NM
DN35CF-DN40CF (2.75" OD) Fixed Tapped 304L SS F0275X000NT
DN50CF (3.38" OD) Fixed Tapped 304L SS F0337X000M
DN50CF (3.38" OD) Fixed Tapped 304L SS F0337X000NT
DN63CF (4.50" OD) Fixed Tapped 304L SS F0450X000NM
DN63CF (4.50" OD) Fixed Tapped 304L SS F0450X000NT
DN75CF (4.63" OD) Fixed Tapped 304L SS F0462X000NT
DN100CF (6.00" OD) Fixed Tapped 304L SS F0600X000NM
DN100CF (6.00" OD) Fixed Tapped 304L SS F0600X000NT
DN125CF (6.75" OD) Fixed Tapped 304L SS F0675X000NT
DN160CF (8.00" OD) Fixed Tapped 304L SS F0800X000NM
DN160CF (8.00" OD) Fixed Tapped 304L SS F0800X000NT
DN200CF (10.00" OD) Fixed Tapped 304L SS F1000X000NM
DN200CF (10.00" OD) Fixed Tapped 304L SS F1000X000NT
DN250CF (12.00" OD) Fixed Tapped 304L SS F1200X000NM
DN250CF (12.00" OD) Fixed Tapped 304L SS F1200X000NT
DN275CF (13.25" OD) Fixed Tapped 304L SS F1325X000NT
DN295CF (14.00" OD) Fixed Tapped 304L SS F1400X000NT
DN350CF (16.50" OD) Fixed Tapped 304L SS F1650X000NT

 

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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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