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

Overview of ConFlat Flanges

The CF (ConFlat) flange is the standard choice for high vacuum (HV) and ultra-high vacuum (UHV) applications. This flange system supports a diverse range of gauges, instruments, accessories, and feedthroughs, making it highly versatile in vacuum technology.

Blank (Blind) Flanges

A blank or blind flange serves as a solid, disc-shaped fitting designed to be used within vacuum systems. It can be machined to create customized fittings or to effectively seal off unused tubing sections or ports on a vacuum chamber.

Seal Mechanism

The sealing mechanism of the CF flange employs a knife-edge machined just below the flange’s flat surface. When the bolts of a flange pair are tightened, these knife-edges cut into a soft metal gasket, creating annular grooves on either side. This process allows the extruded metal to fill in any machining marks and surface imperfections, resulting in a reliable, leak-tight seal. The CF seal can operate under pressures ranging from 760 torr (103 mbar) down to less than 1 x 10^-13 Torr (approximately 1.3 x 10^-13 mbar), and it functions effectively across a temperature range of -196°C to 450°C, depending on the materials used.

In North America, flange sizes are typically indicated by their outside diameter (O.D.), while in Europe and much of Asia, they are often referenced by 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 main configurations:

  1. Fixed Flange: This is a one-piece design with a fixed bolt-hole orientation relative to the fitting, ensuring stability during installation.
  2. Rotatable Flange: Comprising two components—a welded inner ring and an outer bolt ring—this design allows the bolt ring to rotate around the inner weld ring for optimal alignment.

Both fixed and rotatable flanges can be customized to include either through (clearance) holes or tapped holes, providing flexibility for various applications.

Through (Clearance) Holes

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

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

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

Flange Size/OD Note Part Number
DN16CF (1.33" OD) — F0133X025RT
DN16CF (1.33" OD) — F0133X037RT
DN16CF (1.33" OD) — F0133X050RT
DN16CF (1.33" OD) 1 F0133X075RM
DN16CF (1.33" OD) — F0133X075RMW
DN16CF (1.33" OD) 1 F0133X075RT
DN16CF (1.33" OD) — F0133X075RTW
DN25CF (2.13" OD) — F0212X025RT
DN25CF (2.13" OD) — F0212X050RT
DN25CF (2.13" OD) — F0212X075RT
DN25CF (2.13" OD) — F0212X100RT
DN35CF-DN40CF (2.75" OD) — F0275X025RT
DN35CF-DN40CF (2.75" OD) — F0275X050RT
DN35CF-DN40CF (2.75" OD) — F0275X075RT
DN35CF-DN40CF (2.75" OD) — F0275X100RT
DN35CF-DN40CF (2.75" OD) — F0275X125RT
DN35CF-DN40CF (2.75" OD) — F0275X150RM
DN35CF-DN40CF (2.75" OD) — F0275X150RT
DN35CF-DN40CF (2.75" OD) 2 F0275X162RM
DN35CF-DN40CF (2.75" OD) — F0275X162RT
DN35CF-DN40CF (2.75" OD) 2 F0275X175RM
DN35CF-DN40CF (2.75" OD) — F0275X175RT
DN50CF (3.38" OD) — F0337X150RT
DN50CF (3.38" OD) — F0337X200RT
DN63CF (4.50" OD) — F0450X150RT
DN63CF (4.50" OD) — F0450X200RT
DN63CF (4.50" OD) — F0450X250RM
DN63CF (4.50" OD) — F0450X250RT
DN63CF (4.50" OD) — F0450X275RM
DN63CF (4.50" OD) — F0450X275RT
DN75CF (4.63" OD) — F0462X250RT
DN75CF (4.63" OD) — F0462X300RT
DN100CF (6.00" OD) — F0600X400RM
DN100CF (6.00" OD) — F0600X400RT
DN100CF (6.00" OD) — F0600X412RM
DN125CF (6.75" OD) — F0675X400RT
DN125CF (6.75" OD) — F0675X500RT
DN160CF (8.00" OD) — F0800X600RM
DN160CF (8.00" OD) — F0800X600RT
DN160CF (8.00" OD) — F0800X608RM
DN200CF (10.00" OD) — F1000X800RM
DN200CF (10.00" OD) — F1000X800RT
DN200CF (10.00" OD) — F1000X813RM
DN250CF (12.00" OD) — F1200X1000RM
DN250CF (12.00" OD) — F1200X1000RT
DN275CF (13.25" OD) — F1325X1000RT
DN275CF (13.25" OD) — F1325X1075RT
DN295CF (14.00" OD) — F1400X1200RT
DN350CF (16.50" OD) — F1650X1400RT
Flange Size/OD Note Part Number

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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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