Thin Film Materials Logo
Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors
photo-k-hd-f0450x250nt_std

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

Overview of ConFlat Flanges

The CF (ConFlat) flange is the most commonly utilized flange for high vacuum (HV) and ultra-high vacuum (UHV) applications. It serves as a critical component in a wide array of vacuum systems, supporting numerous gauges, instruments, accessories, and feedthroughs.

Blank (Blind) Flanges

A blank or blind flange functions as a solid plate or disc-shaped fitting within vacuum systems. It can be machined to create custom fittings or to effectively seal off unused sections of tubing or ports on vacuum chambers, thereby maintaining the integrity of the system.

Seal Mechanism

The unique sealing mechanism of the CF flange features a knife-edge that is machined below the flange’s flat surface. When the bolts of a flange pair are tightened, the knife-edges form annular grooves on either side of a soft metal gasket. The resulting extrusion from the gasket fills any machining marks and surface imperfections, creating a leak-tight seal. The CF seal operates within a pressure range of 760 torr (103 mbar) to less than 1 x 10^-13 Torr (approximately 1.3 x 10^-13 mbar) and is effective 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.), 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 referenced in their naming conventions.

Types of ConFlat Flanges

ConFlat flanges come in four primary configurations:

  1. Fixed Flange: This one-piece design has a fixed bolt-hole orientation, ensuring consistent alignment during installation.
  2. Rotatable Flange: Comprising an inner weld ring and an outer bolt ring, this design allows the bolt ring to rotate around the inner weld ring, providing flexibility for precise alignment.

Both fixed and rotatable flanges can be customized with either through (clearance) holes or tapped holes, offering adaptability to meet various 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) Fixed Tapped — F0133X025NT
DN16CF (1.33" OD) Fixed Tapped — F0133X037NT
DN16CF (1.33" OD) Fixed Tapped — F0133X050NM
DN16CF (1.33" OD) Fixed Tapped — F0133X050NT
DN16CF (1.33" OD) Fixed Tapped 1 F0133X075NM
DN16CF (1.33" OD) Fixed Tapped Weldneck — F0133X075NMW
DN16CF (1.33" OD) Fixed Tapped 1 F0133X075NT
DN16CF (1.33" OD) Fixed Tapped Weldneck — F0133X075NTW
DN25CF (2.13" OD) Fixed Tapped — F0212X025NT
DN25CF (2.13" OD) Fixed Tapped — F0212X050NT
DN25CF (2.13" OD) Fixed Tapped — F0212X075NT
DN25CF (2.13" OD) Fixed Tapped — F0212X100NM
DN25CF (2.13" OD) Fixed Tapped — F0212X100NT
DN35CF-DN40CF (2.75" OD) Fixed Tapped — F0275X025NT
DN35CF-DN40CF (2.75" OD) Fixed Tapped — F0275X050NT
DN35CF-DN40CF (2.75" OD) Fixed Tapped — F0275X075NT
DN35CF-DN40CF (2.75" OD) Fixed Tapped — F0275X100NM
DN35CF-DN40CF (2.75" OD) Fixed Tapped — F0275X100NT
DN35CF-DN40CF (2.75" OD) Fixed Tapped — F0275X125NT
DN35CF-DN40CF (2.75" OD) Fixed Tapped — F0275X150NM
DN35CF-DN40CF (2.75" OD) Fixed Tapped — F0275X150NT
DN35CF-DN40CF (2.75" OD) Fixed Tapped 2 F0275X162NM
DN35CF-DN40CF (2.75" OD) Fixed Tapped — F0275X162NT
DN35CF-DN40CF (2.75" OD) Fixed Tapped 2 F0275X175NM
DN35CF-DN40CF (2.75" OD) Fixed Tapped — F0275X175NT
DN50CF (3.38" OD) Fixed Tapped — F0337X150NT
DN50CF (3.38" OD) Fixed Tapped — F0337X200NM
DN50CF (3.38" OD) Fixed Tapped — F0337X200NT
DN63CF (4.50" OD) Fixed Tapped — F0450X150NT
DN63CF (4.50" OD) Fixed Tapped — F0450X200NT
DN63CF (4.50" OD) Fixed Tapped — F0450X250NM
DN63CF (4.50" OD) Fixed Tapped — F0450X250NT
DN63CF (4.50" OD) Fixed Tapped — F0450X275NM
DN75CF (4.63" OD) Fixed Tapped — F0462X250NT
DN75CF (4.63" OD) Fixed Tapped — F0462X300NT
DN100CF (6.00" OD) Fixed Tapped — F0600X400NM
DN100CF (6.00" OD) Fixed Tapped — F0600X400NT
DN100CF (6.00" OD) Fixed Tapped — F0600X412NM
DN125CF (6.75" OD) Fixed Tapped — F0675X400NT
DN125CF (6.75" OD) Fixed Tapped — F0675X500NT
DN160CF (8.00" OD) Fixed Tapped — F0800X600NM
DN160CF (8.00" OD) Fixed Tapped — F0800X600NT
DN160CF (8.00" OD) Fixed Tapped — F0800X608NM
DN200CF (10.00" OD) Fixed Tapped — F1000X800NM
DN200CF (10.00" OD) Fixed Tapped — F1000X800NT
DN200CF (10.00" OD) Fixed Tapped — F1000X813NM
DN250CF (12.00" OD) Fixed Tapped — F1200X1000NM
DN250CF (12.00" OD) Fixed Tapped — F1200X1000NT
DN275CF (13.25" OD) Fixed Tapped — F1325X1000NT
DN275CF (13.25" OD) Fixed Tapped — F1325X1075NT
DN295CF (14.00" OD) Fixed Tapped — F1400X1200NT
DN350CF (16.50" OD) Fixed Tapped — F1650X1400NM
DN350CF (16.50" OD) Fixed Tapped — F1650X1400NT
Flange Size/OD Type Note Part Number

Reviews

There are no reviews yet.

Be the first to review “Fixed Tapped-Bored 304L SS Standard ConFlat® (CF) UHV Flanges”

Your email address will not be published. Required fields are marked *

Related Products

Related products

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.

 

Shopping Cart
Scroll to Top