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DN16CF (1.33″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges

Overview of CF (ConFlat) Flange in Vacuum Systems

The CF (ConFlat) flange system is one of the most commonly utilized flange types in both high vacuum and ultra-high vacuum (UHV) applications. It provides a reliable, leak-tight seal, which makes it ideal for critical applications requiring stringent vacuum conditions. Many vacuum components, including gauges, instruments, feedthroughs, and accessories, are compatible with this flange system.

Blank (Blind) Flanges: Purpose and Usage

A blank (or blind) flange is a solid, disc-shaped fitting used primarily to close off unused ports or sections in vacuum systems. In addition to sealing off these sections, blank flanges can be machined for custom fittings, offering flexibility in vacuum chamber designs.

Sealing Mechanism of CF Flanges

The CF flange system employs a unique knife-edge sealing mechanism to create a vacuum-tight seal. This knife-edge, located slightly below the flat surface of the flange, interacts with a soft metal gasket. As the flange bolts are tightened, the knife-edge indents the gasket, forming concentric grooves. This process causes the metal to fill surface imperfections on the flange, ensuring a highly effective seal. The CF seal can maintain vacuum levels from atmospheric pressure (760 torr or 103 mbar) down to < 1 x 10^-13 torr (< 1.3 x 10^-13 mbar), operating within a temperature range of -196°C to 450°C, depending on the materials used.

Flange Size Nomenclature

The way CF flange sizes are referenced can vary by region. In North America, flange sizes are typically denoted by their outer diameter (O.D.). However, in Europe and parts of Asia, the nominal internal diameter (nominal I.D.), referring to the largest tube that can be welded to the bored flange, is often used.

Types of ConFlat Flanges

There are four main variations of ConFlat flanges available, providing flexibility for different applications:

Fixed Flange

The fixed flange design is a single-piece construction where the orientation of the bolt holes is set relative to the fitting. This type of flange is commonly used when a specific alignment is required.

Rotatable Flange

The rotatable flange consists of two components: an inner weld ring and an outer bolt ring. The bolt ring is able to rotate around the weld ring, making it easier to align bolt holes during installation, especially in complex assemblies.

Both fixed and rotatable flanges can be supplied with either through holes (clearance holes) or tapped holes, giving users more options depending on their setup requirements.

Applications of CF Flanges in Vacuum Systems

Due to their robust sealing properties and flexibility, CF flanges are widely used in UHV systems across various industries, including semiconductor manufacturing, materials science research, and high-energy physics. The versatility of these flanges ensures their compatibility with a wide range of vacuum components, making them essential in precision vacuum environments.

Ordering Table

Flange Size/OD Type Flange Material Drawing Part Number Nominal Tube OD Bore Counter Bore Thickness Bolt Circle Dia. Bolt Hole Dia. # of Bolt Holes Thread Size Note
DN16CF (1.33" OD) Fixed 304L SS Tooltip F0133X000N — Blank — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Fixed Tapped 304L SS Tooltip F0133X000NM — Blank — 0.30 1.062 — 6 M4 x 0.7P —
DN16CF (1.33" OD) Fixed Tapped 304L SS Tooltip F0133X000NT — Blank — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Fixed Weldneck 304L SS Tooltip F0133X000NW — Blank — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Rotatable 304L SS Tooltip F0133X000R — Blank — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Rotatable Tapped 304L SS Tooltip F0133X000RM — Blank — 0.30 1.062 — 6 M4 x 0.7P —
DN16CF (1.33" OD) Rotatable Tapped 304L SS Tooltip F0133X000RT — Blank — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Rotatable Tapped Weldneck 304L SS Tooltip F0133X000RTW — Blank — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Rotatable Weldneck 304L SS Tooltip F0133X000RW — Blank — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Fixed 304L SS Tooltip F0133X025N 1/4 0.255 — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Fixed Tapped 304L SS Tooltip F0133X025NT 1/4 0.255 — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Rotatable 304L SS Tooltip F0133X025R 1/4 0.255 — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Rotatable Tapped 304L SS Tooltip F0133X025RT 1/4 0.255 — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Fixed 304L SS Tooltip F0133X037N 3/8 0.380 — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Fixed Tapped 304L SS Tooltip F0133X037NT 3/8 0.380 — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Rotatable 304L SS Tooltip F0133X037R 3/8 0.380 — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Rotatable Tapped 304L SS Tooltip F0133X037RT 3/8 0.380 — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Fixed 304L SS Tooltip F0133X050N 1/2 0.505 — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Fixed Tapped 304L SS Tooltip F0133X050NM 1/2 0.505 — 0.30 1.062 — 6 M4 x 0.7P —
DN16CF (1.33" OD) Fixed Tapped 304L SS Tooltip F0133X050NT 1/2 0.505 — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Rotatable 304L SS Tooltip F0133X050R 1/2 0.505 — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Rotatable Tapped 304L SS Tooltip F0133X050RT 1/2 0.505 — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Fixed 304L SS Tooltip F0133X062N 5/8 0.63 — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Fixed 304L SS Tooltip F0133X075N 3/4 0.63 0.760 0.30 1.062 0.172 6 — 1
DN16CF (1.33" OD) Fixed Tapped 304L SS Tooltip F0133X075NM 3/4 0.63 0.760 0.30 1.062 — 6 M4 x 0.7P 1
DN16CF (1.33" OD) Fixed Tapped Weldneck 304L SS Tooltip F0133X075NMW 3/4 0.63 — 0.30 1.062 — 6 M4 x 0.7P —
DN16CF (1.33" OD) Fixed Tapped 304L SS Tooltip F0133X075NT 3/4 0.63 0.760 0.30 1.062 — 6 #8-32 1
DN16CF (1.33" OD) Fixed Tapped Weldneck 304L SS Tooltip F0133X075NTW 3/4 0.63 — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Fixed Weldneck 304L SS Tooltip F0133X075NW 3/4 0.63 — 0.30 1.062 0.172 6 — —
DN16CF (1.33" OD) Rotatable 304L SS Tooltip F0133X075R 3/4 0.63 0.760 0.30 1.062 0.172 6 — 1
DN16CF (1.33" OD) Rotatable Tapped 304L SS Tooltip F0133X075RM 3/4 0.63 0.760 0.30 1.062 — 6 M4 x 0.7P 1
DN16CF (1.33" OD) Rotatable Tapped Weldneck 304L SS Tooltip F0133X075RMW 3/4 0.63 — 0.30 1.062 — 6 M4 x 0.7P —
DN16CF (1.33" OD) Rotatable Tapped 304L SS Tooltip F0133X075RT 3/4 0.63 0.760 0.30 1.062 — 6 #8-32 1
DN16CF (1.33" OD) Rotatable Tapped Weldneck 304L SS Tooltip F0133X075RTW 3/4 0.63 — 0.30 1.062 — 6 #8-32 —
DN16CF (1.33" OD) Rotatable Weldneck 304L SS Tooltip F0133X075RW 3/4 0.63 — 0.30 1.062 0.172 6 — —

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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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