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Zero-Length Reducer ConFlat® (CF) UHV Flanges (Metric)

Features of Reducer Flanges

When adapting knife-edge flanges of different sizes that require bolting, consider the following key features:

  • Bolt Hole Configuration: Small flanges generally feature blind tapped bolt holes, whereas most large flanges are designed with through-holes. In cases where the diameters of the two flanges are comparable, both will be tapped for secure fastening.
  • Part Numbering: Flanges designated with part numbers that end in the letter “M” signify that they are metric-tapped, catering to specific installation requirements.

Ordering Table

Flange Size/OD Flange Size/OD (Large) Part Number
DN200CF (10.00" OD) DN200CF (10.00" OD) RF1000X275M
DN200CF (10.00" OD) DN200CF (10.00" OD) RF1000X450M
DN200CF (10.00" OD) DN200CF (10.00" OD) RF1000X600M
DN200CF (10.00" OD) DN200CF (10.00" OD) RF1000X800M
DN275CF (13.25" OD) DN275CF (13.25" OD) RF1325X1000M
DN35CF-DN40CF (2.75" OD) DN35CF-DN40CF (2.75" OD) RF275X133M
DN63CF (4.50" OD) DN63CF (4.50" OD) RF450X275M
DN63CF (4.50" OD) DN63CF (4.50" OD) RF450X337M
DN100CF (6.00" OD) DN100CF (6.00" OD) RF600X133M
DN100CF (6.00" OD) DN100CF (6.00" OD) RF600X275M
DN125CF (6.75" OD) DN125CF (6.75" OD) RF675X275M
DN125CF (6.75" OD) DN125CF (6.75" OD) RF675X450M
DN160CF (8.00" OD) DN160CF (8.00" OD) RF800X133M
DN160CF (8.00" OD) DN160CF (8.00" OD) RF800X275M
DN160CF (8.00" OD) DN160CF (8.00" OD) RF800X450M
DN160CF (8.00" OD) DN160CF (8.00" OD) RF800X600M
DN100CF (6.00" OD) DN100CF (6.00" OD) RF600X450M
Flange Size/OD Flange Size/OD (Large) Part Number

Accessories Table

Description For Per Package Manual Part Number
Gasket Clips, For All Conflat (CF) Flange Sizes, (10) Per Package All CF Flanges 10 VGC0275S
Gasket Removal Tool, For All Conflat (CF) Flange Sizes All CF Flanges 1 — VZGRT
Gasket, Copper, DN100CF (6.00" OD) Flange, 4.743" OD,4.006" ID, (10) Per Package All 6" (DN100CF) Flanges 10 — GA-0600
Gasket, Copper, DN125CF (6.75" OD) Flange, 5.567" OD x 5.010" ID, (10) Per Package All 6-3/4" (DN125CF) Flanges 10 — GA-0675
Gasket, Copper, DN160CF (8.00" OD) Flange, 6.743" OD, 6.007" ID, (10) Per Package All 8" (DN160CF) Flanges 10 — GA-0800
Gasket, Copper, DN16CF (1.33" OD) Flange , 0.837" OD, 0.640" ID, (10) Per Package All 1-1/3" (DN16CF) Flanges 10 — GA-0133
Gasket, Copper, DN200CF (10.00" OD) Flange, 8.743" OD, 8.007" ID, (10) Per Package All 10" (DN200CF) Flanges 10 — GA-1000
Gasket, Copper, DN25 (2.125" OD) Flange, 1.291" OD, 1.010" ID, (10) Per Package All 2-1/8" (DN25CF) Flanges 10 — GA-0212
Gasket, Copper, DN250CF (12.00" OD) Flange, 10.743" OD x 10.007" ID, (1) Per Package All 12"(DN250) CF Flanges 1 — GA-1200
Gasket, Copper, DN275CF (13.25" OD) Flange, 11.590" OD, 10.845" ID, (1) Per Package All 13-1/4" CF Flanges 1 — GA-1325
Gasket, Copper, DN35CF-DN40CF (2.75" OD) Flange, 1.895" OD, 1.451" ID, (10) Per Package All 2-3/4" (DN35-DN40CF) Flanges 10 — GA-0275
Gasket, Copper, DN35CF-DN40CF (2.75" OD) Flange, Large Bore, 1.895" OD, 1.528" ID, (10) Per Package All 2-3/4" (DN35-DN40CF) Flanges 10 — GA-0275LB
Gasket, Copper, DN50CF (3.375" OD) Flange, 2.425" OD, 2.010" ID, (10) Per Package All 3-3/8" (DN50CF) Flanges 10 — GA-0337
Gasket, Copper, DN63CF (4.50" OD) Flange, 3.243" OD, 2.506" ID, (10) Per Package All 4-1/2" (DN63CF) Flanges 10 — GA-0450
Gasket, Copper, DN75CF (4.625" OD) Flange, 3.598" OD x 3.010" ID, (10) Per Package All 4-5/8" (DN75CF) Flanges 10 — GA-0462
Hex Bolt & Washer Kit, Stainless Steel, (25) M8 x 35mm Long Hex Bolts & (25) Flat Washers 4-1/2" (DN63CF) Smaller CF Flange 25 — HBKM8X35
Hex Bolt & Washer Kit, Stainless Steel, (25) M8 x 35mm Long Hex Bolts & (25) Flat Washers 4-5/8" (DN75CF) Smaller CF Flange 25 — HBKM8X35
Hex Bolt & Washer Kit, Stainless Steel, (25) M8 x 35mm Long Hex Bolts & (25) Flat Washers 6" (DN100CF) Smaller CF Flange 25 — HBKM8X35
Hex Bolt & Washer Kit, Stainless Steel, (25) M8 x 35mm Long Hex Bolts & (25) Flat Washers 8" (DN160CF) Smaller CF Flange 25 — HBKM8X35
Hex Bolt & Washer Kit, Stainless Steel, (25) M8 x 35mm Long Hex Bolts & (25) Flat Washers 10" (DN200CF) Smaller CF Flange 25 — HBKM8X35
Hex Bolt, Nut & Washer Set, Stainless Steel, (25) 5/16-24 x 3.00" Hex Bolts, (25) Hex Nuts, & (50) Flat Washers 13-1/4" Larger CF Flange 25 — HBS31224300
Hex Bolt, Nut & Washer Set, Stainless Steel, (25) M6 x 35mm Long Hex Bolts, (25) Hex Nuts, & (50) Washers 2-3/4" (DN35-DN40CF) Larger CF Flange 25 — HBSM6X35
Hex Bolt, Nut & Washer Set, Stainless Steel, (25) M8 x 45mm Bolts, (25) Hex Nuts, & (50) Washers 4-1/2" (DN63CF) Larger CF Flange 25 — HBSM8X45
Hex Bolt, Nut & Washer Set, Stainless Steel, (25) M8 x 45mm Bolts, (25) Hex Nuts, & (50) Washers 4-5/8" (DN75CF) Larger CF Flange 25 — HBSM8X45
Hex Bolt, Nut & Washer Set, Stainless Steel, (25) M8 x 60mm Long Hex Bolts, (25) Hex Nuts, & (50) Flat Washers 10" (DN200CF) Larger CF Flange 32 — HBSM8X60
M8—1.25 x 30 MM Reducer Bolt Set 3-3/8" (DN50CF) Smaller CF Flange 25 — HBKM8X30
M8—1.25 x 50 MM Reducer Bolt Set 6" (DN100CF) Larger CF Flange 25 — HBSM8X35
M8—1.25 x 50 MM Reducer Bolt Set 6-3/4" (DN125CF) Larger CF Flange 25 — HBSM8X35
M8—1.25 x 50 MM Reducer Bolt Set 8" (DN160CF) Larger CF Flange 25 — HBSM8X35
Socket Head Cap Screw & Washer Set, Stainless Steel, (25) M4 x 16mm Socket Head Cap Screws & (25) Flat Washers 1-1/3" (DN16CF) Smaller CF Flange 25 — SBKM4X16S4-25
Thread Lubricant, 4 Ounce Tube All CF Flanges 1 — VZTL-4OZ
Description For Per Package Manual Part Number

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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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