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

Overview of ConFlat Flanges

The CF (ConFlat) flange stands as the most commonly utilized flange for high vacuum (HV) and ultra-high vacuum (UHV) applications. It supports a diverse range of gauges, instruments, accessories, and feedthroughs, making it essential for various vacuum systems.

Blank (Blind) Flange

A blank or blind flange serves as a solid, disc-shaped component in vacuum systems. It can be machined to create a tailored fitting or to seal off an unused section of tubing or a port on a vacuum chamber, ensuring a reliable closure.

Seal Mechanism

The CF flange employs a unique seal mechanism characterized by a knife-edge that is machined below the flange’s flat surface. When the bolts of a flange pair are tightened, the knife-edges carve annular grooves on either side of a soft metal gasket. This extruded metal effectively fills any machining marks and surface imperfections, leading to a leak-tight seal. The CF seal operates under a wide range of pressures, from 760 torr (103 mbar) down to less than 1 x 10^-13 Torr (approximately 1.3 x 10^-13 mbar), and can withstand temperatures from -196°C to 450°C, depending on the materials involved.

Flange sizes in North America are typically indicated 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 commonly referenced.

Types of ConFlat Flanges

ConFlat flanges are available in four main configurations:

  1. Fixed Flange: This one-piece design has a fixed bolt-hole orientation relative to the fitting, ensuring stable alignment.
  2. Rotatable Flange: This design consists of two components—an inner weld ring and an outer bolt ring—that allows the bolt ring to rotate around the inner weld ring, providing flexibility in alignment.

Both fixed and rotatable flanges can be customized with either through (clearance) holes or tapped holes, offering versatility to meet 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.

Orderiht Tablr

Flange Size/OD Type Note Part Number Price
DN16CF (1.33" OD) Fixed — F0133X025N $18.65
DN16CF (1.33" OD) Fixed — F0133X037N $16.80
DN16CF (1.33" OD) Fixed — F0133X050N $16.35
DN16CF (1.33" OD) Fixed — F0133X062N $20.00
DN16CF (1.33" OD) Fixed 1 F0133X075N $18.15
DN16CF (1.33" OD) Fixed Weldneck — F0133X075NW $16.25
DN25CF (2.13" OD) Fixed — F0212X025N P.O.R.
DN25CF (2.13" OD) Fixed — F0212X050N $21.75
DN25CF (2.13" OD) Fixed — F0212X075N $16.60
DN25CF (2.13" OD) Fixed — F0212X100N $16.60
DN35CF-DN40CF (2.75" OD) Fixed — F0275X025N $21.00
DN35CF-DN40CF (2.75" OD) Fixed — F0275X037N $33.50
DN35CF-DN40CF (2.75" OD) Fixed — F0275X050N $28.25
DN35CF-DN40CF (2.75" OD) Fixed — F0275X062N $35.00
DN35CF-DN40CF (2.75" OD) Fixed — F0275X075N $27.00
DN35CF-DN40CF (2.75" OD) Fixed — F0275X100N $28.00
DN35CF-DN40CF (2.75" OD) Fixed — F0275X125N $25.00
DN35CF-DN40CF (2.75" OD) Fixed — F0275X150N $25.00
DN35CF-DN40CF (2.75" OD) Fixed — F0275X162N $25.00
DN35CF-DN40CF (2.75" OD) Fixed — F0275X175N $32.00
DN50CF (3.38" OD) Fixed — F0337X150N $55.30
DN50CF (3.38" OD) Fixed — F0337X200N $54.15
DN63CF (4.50" OD) Fixed — F0450X150N $75.70
DN63CF (4.50" OD) Fixed — F0450X200N $59.05
DN63CF (4.50" OD) Fixed — F0450X250N $75.70
DN63CF (4.50" OD) Fixed — F0450X275N $83.55
DN75CF (4.63" OD) Fixed — F0462X200N P.O.R.
DN75CF (4.63" OD) Fixed — F0462X250N $89.15
DN75CF (4.63" OD) Fixed — F0462X300N $82.65
DN100CF (6.00" OD) Fixed — F0600X400N $110.00
DN100CF (6.00" OD) Fixed — F0600X412N $170.50
DN125CF (6.75" OD) Fixed — F0675X400N $171.95
DN125CF (6.75" OD) Fixed — F0675X450N P.O.R.
DN125CF (6.75" OD) Fixed — F0675X500N $127.55
DN160CF (8.00" OD) Fixed — F0800X400N $245.00
DN160CF (8.00" OD) Fixed — F0800X600N $260.00
DN160CF (8.00" OD) Fixed — F0800X608N $213.45
DN200CF (10.00" OD) Fixed — F1000X800N $471.85
DN250CF (12.00" OD) Fixed — F1200X1000N $907.50
DN275CF (13.25" OD) Fixed — F1325X1000N $935.00
DN275CF (13.25" OD) Fixed Tapped — F1325X1000NM $935.00
DN275CF (13.25" OD) Fixed — F1325X1075N $678.65
DN295CF (14.00" OD) Fixed — F1400X1200N $824.75
DN295CF (14.00" OD) Fixed Tapped F1400X1200NM P.O.R.
DN350CF (16.50" OD) Fixed — F1650X1400N $2,085.50
Flange Size/OD Type Note Part Number Price

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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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