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DN50CF (3.375″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges

TFM Flange System for High Vacuum and UHV Applications

The TFM flange system is renowned for its extensive use in high vacuum and ultra-high vacuum (UHV) applications. It supports a variety of vacuum components, including gauges, instruments, accessories, and feedthroughs, making it a versatile choice for many systems.

Blank (Blind) Flanges: Design and Utility

A blank (or blind) flange is a solid, disc-shaped fitting that is utilized in vacuum systems to seal off unused sections of tubing or ports. These flanges can also be customized through machining to fit specific requirements, providing flexibility in the design and modification of vacuum setups.

Sealing Mechanism of TFM Flanges

TFM flanges feature a knife-edge sealing mechanism, strategically machined below the flange’s flat surface. As the bolts are tightened in a flange pair, the knife-edges cut annular grooves in a soft metal gasket. This action compresses the gasket, allowing the extruded metal to fill in any machining marks and surface irregularities, creating a leak-tight seal. TFM seals operate effectively from 760 torr (103 mbar) down to less than 1 x 10^-13 Torr (1.3 x 10^-13 mbar) and are capable of functioning within a temperature range of -196°C to 450°C, depending on the material used.

Flange Size Reference

In North America, TFM flange sizes are typically specified by their outer diameter (O.D.). In contrast, in Europe and much of Asia, the nominal internal diameter (nominal I.D.)—the maximum tube size that can be welded to a bored flange—is often used for sizing nomenclature.

Types of TFM Flanges

TFM flanges are available in several versions, each designed to cater to different installation requirements:

Fixed Flange

The fixed flange features a one-piece design where the orientation of the bolt holes is fixed concerning the fitting. This design is useful when a specific alignment is necessary.

Rotatable Flange

A rotatable flange comprises two components: an inner weld ring and an outer bolt ring. This design allows the bolt ring to rotate around the inner weld ring, facilitating easier alignment during installation, especially in complex configurations.

Both fixed and rotatable flanges can be offered with either through (clearance) holes or tapped holes, giving users the flexibility to choose based on their installation needs.

Applications of TFM Flanges

Due to their exceptional sealing properties and versatility, TFM flanges are widely used across various industries that require stringent vacuum integrity. They are essential in semiconductor manufacturing, scientific research, and high-energy physics, where maintaining high or ultra-high vacuum conditions is critical.

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 Drawing Nominal Tube OD Bore Counter Bore Thickness Bolt Circle Dia. Bolt Hole Dia. # of Bolt Holes Thread Size Setback Part Number
DN50CF (3.38" OD) Fixed Tapped 304L SS Tooltip — Blank — 0.63 2.850 — 8 M8 x 1.25P — F0337X000M
DN50CF (3.38" OD) Fixed 304L SS Tooltip — Blank — 0.63 2.850 0.33 8 — — F0337X000N
DN50CF (3.38" OD) Fixed Tapped 304L SS Tooltip — Blank — 0.63 2.850 — 8 5/16-24 — F0337X000NT
DN50CF (3.38" OD) Rotatable 304L SS Tooltip — Blank — 0.68 2.850 0.33 8 — — F0337X000R
DN50CF (3.38" OD) Rotatable Tapped 304L SS Tooltip — Blank — 0.68 2.850 — 8 5/16-24 — F0337X000RT
DN50CF (3.38" OD) Fixed 304L SS Tooltip 1-1/2 1.44 1.510 0.63 2.850 0.33 8 — 0.225 F0337X150N
DN50CF (3.38" OD) Fixed Tapped 304L SS Tooltip 1-1/2 1.44 1.510 0.63 2.850 — 8 5/16-24 0.225 F0337X150NT
DN50CF (3.38" OD) Rotatable 304L SS Tooltip 1-1/2 1.44 1.520 0.68 2.850 0.33 8 — 0.225 F0337X150R
DN50CF (3.38" OD) Rotatable Tapped 304L SS Tooltip 1-1/2 1.44 1.520 0.68 2.850 — 8 5/16-24 0.225 F0337X150RT
DN50CF (3.38" OD) Fixed 304L SS Tooltip 2 1.94 2.010 0.63 2.850 0.33 8 — 0.225 F0337X200N
DN50CF (3.38" OD) Fixed Tapped 304L SS Tooltip 2 1.94 2.010 0.63 2.850 — 8 M8 x 1.25P 0.225 F0337X200NM
DN50CF (3.38" OD) Fixed Tapped 304L SS Tooltip 2 1.94 2.010 0.63 2.850 — 8 5/16-24 0.225 F0337X200NT
DN50CF (3.38" OD) Rotatable 304L SS Tooltip 2 1.94 2.020 0.68 2.850 0.33 8 — 0.225 F0337X200R
DN50CF (3.38" OD) Rotatable Tapped 304L SS Tooltip 2 1.94 2.020 0.68 2.850 — 8 5/16-24 0.225 F0337X200RT

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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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