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304L SS Double-Faced ConFlat® (CF) UHV Flanges

Double-faced CF flanges are designed with identical knife-edged sealing surfaces on both sides, making them versatile for various applications. The CF flange remains the most widely used option for high vacuum and ultra-high vacuum (UHV) applications, offering compatibility with a broad range of gauges, instruments, accessories, and feedthroughs.

Double-Faced Flange Features

  • Uniform Sealing Surface: Unlike reducer flanges, which accommodate two different flange sizes, double-faced flanges maintain the same size on both sides.
  • Bolt Hole Design: Equipped with through-hole bolt holes; tapped bolt hole versions are also available (please contact us for details).

Ordering Table

Flange Size/OD Type Flange Material Part Number
DN200CF (10.00" OD) Double-Faced 304L SS DFF1000X000
DN200CF (10.00" OD) Double-Faced 304L SS DFF1000X800
DN275CF (13.25" OD) Double-Faced 304L SS DFF1325X000
DN275CF (13.25" OD) Double-Faced 304L SS DFF1325X1000
DN16CF (1.33" OD) Double-Faced 304L SS DFF133X000
DN16CF (1.33" OD) Double-Faced 304L SS DFF133X062
DN25CF (2.13" OD) Double-Faced 304L SS DFF212X000
DN25CF (2.13" OD) Double-Faced 304L SS DFF212X100
DN35CF-DN40CF (2.75" OD) Double-Faced 304L SS DFF275X000
DN35CF-DN40CF (2.75" OD) Double-Faced 304L SS DFF275X150
DN35CF-DN40CF (2.75" OD) Double-Faced 304L SS DFF275X150S
DN35CF-DN40CF (2.75" OD) Double-Faced 304L SS DFF275X150SS
DN50CF (3.38" OD) Double-Faced 304L SS DFF337X000
DN50CF (3.38" OD) Double-Faced 304L SS DFF337X200
DN63CF (4.50" OD) Double-Faced 304L SS DFF450X000
DN63CF (4.50" OD) Double-Faced 304L SS DFF450X250
DN75CF (4.63" OD) Double-Faced 304L SS DFF462X000
DN75CF (4.63" OD) Double-Faced 304L SS DFF462X300
DN100CF (6.00" OD) Double-Faced 304L SS DFF600X000
DN100CF (6.00" OD) Double-Faced 304L SS DFF600X400
DN125CF (6.75" OD) Double-Faced 304L SS DFF675X000
DN125CF (6.75" OD) Double-Faced 304L SS DFF675X500
DN160CF (8.00" OD) Double-Faced 304L SS DFF800X000
DN160CF (8.00" OD) Double-Faced 304L SS DFF800X600
Flange Size/OD Type Flange Material Part Number

Accessories Table

Description For Per Package Note Manual Part Number
Gasket, Copper, DN16CF (1.33" OD) Flange , 0.837" OD, 0.640" ID, (10) Per Package 1-1/3" (DN16CF) Double-Faced CF Flanges 10 — — GA-0133
Gasket, Copper, DN25 (2.125" OD) Flange, 1.291" OD, 1.010" ID, (10) Per Package 2-1/8" (DN25CF) Double-Faced CF Flanges 10 — — GA-0212
Gasket, Copper, DN35CF-DN40CF (2.75" OD) Flange, 1.895" OD, 1.451" ID, (10) Per Package 2-3/4" (DN35-DN40CF) Double-Faced CF Flanges 10 — — GA-0275
Gasket, Copper, DN50CF (3.375" OD) Flange, 2.425" OD, 2.010" ID, (10) Per Package 3-3/8" (DN50CF) Double-Faced CF Flanges 10 — — GA-0337
Gasket, Copper, DN63CF (4.50" OD) Flange, 3.243" OD, 2.506" ID, (10) Per Package 4-1/2" (DN63CF) Double-Faced CF Flanges 10 — — GA-0450
Gasket, Copper, DN75CF (4.625" OD) Flange, 3.598" OD x 3.010" ID, (10) Per Package 4-5/8" (DN75CF) Double-Faced CF Flanges 10 — — GA-0462
Gasket, Copper, DN100CF (6.00" OD) Flange, 4.743" OD,4.006" ID, (10) Per Package 6" (DN100CF) Double-Faced CF Flanges 10 — — GA-0600
Gasket, Copper, DN125CF (6.75" OD) Flange, 5.567" OD x 5.010" ID, (10) Per Package 6-3/4" (DN125CF) Double-Faced CF Flanges 10 — — GA-0675
Gasket, Copper, DN160CF (8.00" OD) Flange, 6.743" OD, 6.007" ID, (10) Per Package 8" (DN160CF) Double-Faced CF Flanges 10 — — GA-0800
Gasket, Copper, DN200CF (10.00" OD) Flange, 8.743" OD, 8.007" ID, (10) Per Package 10" (DN200CF) Double-Faced CF Flanges 10 — — GA-1000
Gasket, Copper, DN275CF (13.25" OD) Flange, 11.590" OD, 10.845" ID, (1) Per Package 13-1/4" Double-Faced CF Flanges 1 — — GA-1325
Socket Head Cap Screw, Nut & Washer Set, Stainless Steel, (25) 8-32 x 1.25" Long Socket Head Cap Screws & (25) Flat Washers 1-1/3" (DN16CF) Double-Faced CF Flanges 25 — — SBS832125S4-25
Hex Bolt, Nut & Washer Set, Stainless Steel, (25) 1/4-28 x 2.00" Long Hex Bolts, (25) Hex Nuts, & (50) Flat Washers 2-1/8" (DN25CF) Double-Faced CF Flanges 25 1 — HBS25028200
Hex Bolt, Nut & Washer Set, Stainless Steel, (25) 1/4-28 x 2.25" Long Hex Bolts, (25) Hex Nuts, & (50) Flat Washers 2-3/4" (DN35-DN40CF) Double-Faced CF Flanges 25 1 — HBS25028225
Hex Bolt, Nut & Washer Set, Stainless Steel, (25) 5/16-24 x 2.25" Hex Bolts, (25) Hex Nuts, & (50) Flat Washers 3-3/8" (DN50CF) & 6-3/4" (DN125CF) Double-Faced CF Flanges 25 — — HBS31224225
Hex,bolt, Nut & Washer Set, Stainless Steel, (25) 5/16-24 x 2.50" Hex Bolts, (25) Hex Nuts, & (50) Flat Washers 4-1/2" (DN63CF) & 4-5/8" (DN75CF) Double-Faced CF Flanges 25 — — HBS31224250
Hex Bolt, Nut & Washer Set, Stainless Steel, (25) 5/16-24 x 3.00" Hex Bolts, (25) Hex Nuts, & (50) Flat Washers 6" (DN100CF) & 8" (DN160CF) Double-Faced CF Flanges 25 — — HBS31224300
Hex Bolt, Nut & Washer Set, Stainless Steel, (25) 5/16-24 x 3.50" Hex Bolts, (25) Hex Nuts, & (50) Flat Washers 10" (DN200CF) Double-Faced CF Flanges 25 — — HBS31224350
Hex Bolt, Nut & Washer Set, Stainless Steel, (30) 3/8-24 x 4.00" Hex Bolts, (30) Hex Nuts, & (60) Flat Washers 13-1/4" Double-Faced CF Flanges 30 — — HBS37524400
Gasket Removal Tool, For All Conflat (CF) Flange Sizes All CF Flanges 1 — — VZGRT
Thread Lubricant, 4 Ounce Tube All CF Flanges 1 — — VZTL-4OZ
Gasket Clips, For All Conflat (CF) Flange Sizes, (10) Per Package All CF Flanges 10 — VGC0275S

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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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