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DN63CF (4.50″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges

TFM Flanges for High Vacuum and UHV Applications

The TFM flange system is recognized as the leading choice for high vacuum and ultra-high vacuum (UHV) applications. This versatile system supports a wide array of components, including gauges, instruments, accessories, and feedthroughs, making it ideal for various vacuum setups.

Understanding Blank (Blind) Flanges

A blank (or blind) flange is a solid, disc-shaped fitting designed for use in vacuum systems. Its primary function is to close off unused tubing sections or ports on a vacuum chamber. Additionally, these flanges can be machined to create customized fittings, allowing for greater flexibility in design.

The Sealing Mechanism of TFM Flanges

TFM flanges feature a knife-edge sealing mechanism, which is machined below the flange’s flat surface. When the bolts of a flange pair are tightened, the knife-edges cut annular grooves on both sides of a soft metal gasket. As the gasket material extrudes into these grooves, it fills any machining marks and surface defects, resulting in a leak-tight seal. TFM seals operate effectively across a pressure range from 760 torr (103 mbar) down to < 1 x 10^-13 Torr (< 1.3 x 10^-13 mbar) and can withstand temperatures from -196°C to 450°C, depending on the materials involved.

Flange Size Nomenclature

In North America, the sizes of TFM flanges are typically identified by their outer diameter (O.D.). In contrast, European and Asian standards often refer to the nominal internal diameter (I.D.) of the largest tube that can be welded to a bored flange.

Available Versions of TFM Flanges

TFM flanges come in several variations to meet different operational requirements:

Fixed Flange

The fixed flange is a single-piece design with a bolt-hole orientation that remains constant relative to the fitting. This design is beneficial for installations where a specific alignment is essential.

Rotatable Flange

The rotatable flange consists of two parts: an inner weld ring and an outer bolt ring. This design allows the bolt ring to rotate around the inner weld ring, simplifying the alignment of the bolt holes during installation.

Both fixed and rotatable TFM flanges can be supplied with your choice of through (clearance) holes or tapped holes, providing additional flexibility in application.

Applications of TFM Flanges

Due to their robust sealing capabilities and adaptability, TFM flanges are widely used across various industries requiring high or ultra-high vacuum conditions. They play a crucial role in sectors such as semiconductor manufacturing, materials research, and scientific instrumentation, where maintaining optimal vacuum integrity is paramount.

Ordering Table

Flange Size/OD Type Flange Material Drawing Nominal Tube OD Bore Counter Bore Thickness Bolt Circle Dia. Bolt Hole Dia. # of Bolt Holes Thread Size Note Part Number
DN63CF (4.50" OD) Fixed 304L SS Tooltip — Blank — 0.68 3.628 0.332 8 — — F0450X000N
DN63CF (4.50" OD) Fixed Tapped 304L SS Tooltip — Blank — 0.68 3.628 — 8 M8 x 1.25P — F0450X000NM
DN63CF (4.50" OD) Fixed Tapped 304L SS Tooltip — Blank — 0.68 3.628 — 8 5/16-24 — F0450X000NT
DN63CF (4.50" OD) Rotatable 304L SS Tooltip — Blank — 0.75 3.628 0.332 8 — — F0450X000R
DN63CF (4.50" OD) Rotatable Tapped 304L SS Tooltip — Blank — 0.75 3.628 — 8 M8 x 1.25P — F0450X000RM
DN63CF (4.50" OD) Rotatable Tapped 304L SS Tooltip — Blank — 0.75 3.628 — 8 5/16-24 F0450X000RT
DN63CF (4.50" OD) Fixed 304L SS Tooltip 1-1/2 1.44 1.510 0.68 3.628 0.332 8 — — F0450X150N
DN63CF (4.50" OD) Fixed Tapped 304L SS Tooltip 1-1/2 1.44 1.510 0.68 3.628 — 8 5/16-24 — F0450X150NT
DN63CF (4.50" OD) Rotatable 304L SS Tooltip 1-1/2 1.44 1.520 0.75 3.628 0.332 8 — — F0450X150R
DN63CF (4.50" OD) Rotatable Tapped 304L SS Tooltip 1-1/2 1.44 1.520 0.75 3.628 — 8 5/16-24 — F0450X150RT
DN63CF (4.50" OD) Fixed 304L SS Tooltip 2 1.94 2.010 0.68 3.628 0.332 8 — — F0450X200N
DN63CF (4.50" OD) Fixed Tapped 304L SS Tooltip 2 1.94 2.010 0.68 3.628 — 8 5/16-24 — F0450X200NT
DN63CF (4.50" OD) Rotatable 304L SS Tooltip 2 1.94 2.020 0.75 3.628 0.332 8 — — F0450X200R
DN63CF (4.50" OD) Rotatable Tapped 304L SS Tooltip 2 1.94 2.020 0.75 3.628 — 8 5/16-24 — F0450X200RT
DN63CF (4.50" OD) Fixed 304L SS Tooltip 2-1/2 2.44 2.510 0.68 3.628 0.332 8 — — F0450X250N
DN63CF (4.50" OD) Fixed Tapped 304L SS Tooltip 2-1/2 2.44 2.510 0.68 3.628 — 8 M8 x 1.25P — F0450X250NM
DN63CF (4.50" OD) Fixed Tapped 304L SS Tooltip 2-1/2 2.44 2.510 0.68 3.628 — 8 5/16-24 — F0450X250NT
DN63CF (4.50" OD) Rotatable 304L SS Tooltip 2-1/2 2.44 2.520 0.75 3.628 0.332 8 — — F0450X250R
DN63CF (4.50" OD) Rotatable Tapped 304L SS Tooltip 2-1/2 2.44 2.520 0.75 3.628 — 8 M8 x 1.25P — F0450X250RM
DN63CF (4.50" OD) Rotatable Tapped 304L SS Tooltip 2-1/2 2.44 2.520 0.75 3.628 — 8 5/16-24 — F0450X250RT
DN63CF (4.50" OD) Fixed 304L SS Tooltip 2-3/4 2.69 2.760 0.68 3.628 0.332 8 — — F0450X275N
DN63CF (4.50" OD) Fixed Tapped 304L SS Tooltip 2-3/4 2.69 2.760 0.68 3.628 — 8 M8 x 1.25P — F0450X275NM
DN63CF (4.50" OD) Rotatable 304L SS Tooltip 2-3/4 2.69 2.770 0.75 3.628 0.332 8 — — F0450X275R
DN63CF (4.50" OD) Rotatable Tapped 304L SS Tooltip 2-3/4 2.69 2.770 0.75 3.628 — 8 M8 x 1.25P — F0450X275RM
DN63CF (4.50" OD) Rotatable Tapped 304L SS Tooltip 2-3/4 2.69 2.770 0.75 3.628 — 8 5/16-24 — F0450X275RT
DN63CF (4.50" OD) Fixed Tapped 304L SS Tooltip 2-3/4 2.69 2.760 0.68 3.628 — 8 5/16-24 — F0450X275NT

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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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