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

Representative Image

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

Adapt two different-size knife-edge flanges that need to be bolted together.

Reducer Flange Features:

All small flanges have blind tapped bolt holes — most large flanges have through-holes (where the two flanges have similar diameters, both are tapped)
Part numbers ending with the letter "M" represent metric-tapped flanges

ISO Standard KJLC flanges & gaskets are compatible with flanges produced to the ISO3669-2017 & ASTM E2734/E2734M-10 standards.

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Ordering Table

(Click column headers to sort data)

Flange Size/OD

Flange Size/OD (Large)

Flange Size/OD (Small)

Type

Flange Material

Drawing

Bore

Thickness

Bolt Circle Dia. (Large)

Hole/Thread Size (Large)

# of Bolt Holes (Large)

Bolt Circle Dia. (Small)

Thread Size (Small)

# of Bolt Holes (Small)

Description

VacuCAD^SM

Part Number

Price

In Stock

Add To Cart

Flange Size/OD

Flange Size/OD (Large)

Flange Size/OD (Small)

Type

Flange Material

Drawing

Bore

Thickness

Bolt Circle Dia. (Large)

Hole/Thread Size (Large)

# of Bolt Holes (Large)

Bolt Circle Dia. (Small)

Thread Size (Small)

# of Bolt Holes (Small)

Description

VacuCAD^SM

Part Number

Price

In Stock

Add To Cart

DN200CF (10.00" OD)

DN35CF-DN40CF (2.75" OD)

Zero-Length Reducer

304L SS

1.50

0.97

9.128

0.332

2.312

M6 X 1.0P

FLANGE,UHV,SS,ZERO LENGTH REDUCING,10" TO 2-3/4",METRIC TP

(please log in)

RF1000X275M

$757.75

DN200CF (10.00" OD)

DN63CF (4.50" OD)

Zero-Length Reducer

304L SS

2.50

0.97

9.128

0.332

3.628

M8 X 1.25P

REDUCING FLANGE,10"OD X 4-1/2" OD UHV,M8 X 1.25 TAPPED HOLES

(please log in)

RF1000X450M

P.O.R.

DN200CF (10.00" OD)

DN100CF (6.00" OD)

Zero-Length Reducer

304L SS

4.00

0.97

9.128

0.332

5.128

M8 X 1.25P

FLANGE,UHV,SS,REDUCING,10"OD TO 6"OD,M8 X 1.25 TPD HLS

(please log in)

RF1000X600M

$559.80

DN200CF (10.00" OD)

DN160CF (8.00" OD)

Zero-Length Reducer

304L SS

6.00

0.97

9.128

0.332

7.128

M8 X 1.25P

REDUCING FLANGE,10"OD X 8"FLG, M8 X 1.25 TPD HOLES

(please log in)

RF1000X800M

$577.10

DN275CF (13.25" OD)

DN200CF (10.00" OD)

Zero-Length Reducer

304L SS

8.00

1.12

12.060

0.413

9.128

M8 X 1.25P

REDUCING FLANGE,13-1/4"OD X 10"OD FLG,METRIC TAPPED

(please log in)

RF1325X1000M

P.O.R.

DN35CF-DN40CF (2.75" OD)

DN16CF (1.33" OD)

Zero-Length Reducer

304L SS

0.62

0.50

2.312

0.265

1.062

M4 X 0.7P

REDUCING FLANGE, 2-3/4" X 1.33 MINI, M4 X 0.7 TAPPED HOLES

(please log in)

RF275X133M

$80.00

DN63CF (4.50" OD)

DN35CF-DN40CF (2.75" OD)

Zero-Length Reducer

304L SS

1.50

0.68

3.628

0.332

2.312

M6 X 1.0P

REDUCING FLANGE, 4-1/2" OD X 2-3/4" FLG, M6 X 1.0 TPD HOLES

(please log in)

RF450X275M

$165.70

DN63CF (4.50" OD)

DN50CF (3.38" OD)

Zero-Length Reducer

304L SS

2.00

0.68

3.628

0.332

2.850

M8 X 1.25P

REDUCING FLANGE,Z-L,4-1/2"OD TPD X 3-3/8"OD TPD M8 METRIC

(please log in)

RF450X337M

P.O.R.

DN100CF (6.00" OD)

DN16CF (1.33" OD)

Zero-Length Reducer

304L SS

0.62

0.78

5.128

0.332

1.062

M4 X 0.7P

REDUCING FLANGE,6"OD X 1-1/3" FLANGE,M4 X 0.7 TPD HOLES

(please log in)

RF600X133M

$147.00

DN100CF (6.00" OD)

DN35CF-DN40CF (2.75" OD)

Zero-Length Reducer

304L SS

1.50

0.78

5.128

0.332

2.312

M6 X 1.0P

REDUCING FLANGE,6"OD X 2-3/4" FLANGE,M6 X 1.0 TAPPED HOLES

(please log in)

RF600X275M

$211.55

DN125CF (6.75" OD)

DN35CF-DN40CF (2.75" OD)

Zero-Length Reducer

304L SS

1.50

0.84

5.969

0.332

2.312

M6 X 1.0P

REDUCING FLG,6-3/4"OD X 2-3/4" M6X1.0 TPD HLS

(please log in)

RF675X275M

P.O.R.

DN125CF (6.75" OD)

DN63CF (4.50" OD)

Zero-Length Reducer

304L SS

2.50

0.78

5.969

0.332

3.628

M8 X 1.25P

REDUCING FLANGE,UHV,6.75"OD X 4.50"FLANGE,METRIC TAPPED

(please log in)

RF675X450M

P.O.R.

DN160CF (8.00" OD)

DN16CF (1.33" OD)

Zero-Length Reducer

304L SS

6.00

0.88

7.128

0.332

1.062

M4 X 0.7P

REDUCING FLANGE, 8" OD X 1.33" FLANGE, METRIC TAPPED

(please log in)

RF800X133M

P.O.R.

DN160CF (8.00" OD)

DN35CF-DN40CF (2.75" OD)

Zero-Length Reducer

304L SS

1.50

0.88

7.128

0.332

2.312

M6 X 1.0P

REDUCING FLANGE,8"OD X 2-3/4" FLANGE,M6 X 1.0 TPD HOLES

(please log in)

RF800X275M

$300.00

DN160CF (8.00" OD)

DN63CF (4.50" OD)

Zero-Length Reducer

304L SS

2.50

0.88

7.128

0.332

3.628

M8 X 1.25P

REDUCING FLANGE,8"OD X 4-1/2" M8 X 1.25 TPD HOLES

(please log in)

RF800X450M

$295.00

DN160CF (8.00" OD)

DN100CF (6.00" OD)

Zero-Length Reducer

304L SS

4.00

0.88

7.128

0.332

5.128

M8 X 1.25P

REDUCING FLANGE, 8"OD X 6"FLG, M8 X 1.25 TAPPED HOLES

(please log in)

RF800X600M

$390.00

DN100CF (6.00" OD)

DN63CF (4.50" OD)

Zero-Length Reducer

304L SS

2.50

0.78

5.128

0.332

3.628

M8 X 1.25P

REDUCING FLANGE, 6" OD X 4-1/2 FLG, M8 X 1.25 TAPPED HOLES

(please log in)

RF600X450M

$267.50

Flange Size/OD

Flange Size/OD (Large)

Flange Size/OD (Small)

Type

Flange Material

Drawing

Bore

Thickness

Bolt Circle Dia. (Large)

Hole/Thread Size (Large)

# of Bolt Holes (Large)

Bolt Circle Dia. (Small)

Thread Size (Small)

# of Bolt Holes (Small)

Description

VacuCAD^SM

Part Number

Price

In Stock

Add To Cart

Flange Size/OD

Flange Size/OD (Large)

Flange Size/OD (Small)

Type

Flange Material

Drawing

Bore

Thickness

Bolt Circle Dia. (Large)

Hole/Thread Size (Large)

# of Bolt Holes (Large)

Bolt Circle Dia. (Small)

Thread Size (Small)

# of Bolt Holes (Small)

Description

VacuCAD^SM

Part Number

Price

In Stock

Add To Cart

DN200CF (254.00 mm OD)

DN35CF-DN40CF (69.85 mm OD)

Zero-Length Reducer

304L SS

38.100

24.638

231.851

8.433

58.725

M6 X 1.0P

FLANGE,UHV,SS,ZERO LENGTH REDUCING,10" TO 2-3/4",METRIC TP

(please log in)

RF1000X275M

$757.75

DN200CF (254.00 mm OD)

DN63CF (114.30 mm OD)

Zero-Length Reducer

304L SS

63.500

24.638

231.851

8.433

92.151

M8 X 1.25P

REDUCING FLANGE,10"OD X 4-1/2" OD UHV,M8 X 1.25 TAPPED HOLES

(please log in)

RF1000X450M

P.O.R.

DN200CF (254.00 mm OD)

DN100CF (152.40 mm OD)

Zero-Length Reducer

304L SS

101.600

24.638

231.851

8.433

130.251

M8 X 1.25P

FLANGE,UHV,SS,REDUCING,10"OD TO 6"OD,M8 X 1.25 TPD HLS

(please log in)

RF1000X600M

$559.80

DN200CF (254.00 mm OD)

DN160CF (203.20 mm OD)

Zero-Length Reducer

304L SS

152.400

24.638

231.851

8.433

181.051

M8 X 1.25P

REDUCING FLANGE,10"OD X 8"FLG, M8 X 1.25 TPD HOLES

(please log in)

RF1000X800M

$577.10

DN275CF (336.55 mm OD)

DN200CF (254.00 mm OD)

Zero-Length Reducer

304L SS

203.200

28.448

306.324

10.490

231.851

M8 X 1.25P

REDUCING FLANGE,13-1/4"OD X 10"OD FLG,METRIC TAPPED

(please log in)

RF1325X1000M

P.O.R.

DN35CF-DN40CF (69.85 mm OD)

DN16CF (33.78 mm OD)

Zero-Length Reducer

304L SS

15.748

12.700

58.725

6.731

26.975

M4 X 0.7P

REDUCING FLANGE, 2-3/4" X 1.33 MINI, M4 X 0.7 TAPPED HOLES

(please log in)

RF275X133M

$80.00

DN63CF (114.30 mm OD)

DN35CF-DN40CF (69.85 mm OD)

Zero-Length Reducer

304L SS

38.100

17.272

92.151

8.433

58.725

M6 X 1.0P

REDUCING FLANGE, 4-1/2" OD X 2-3/4" FLG, M6 X 1.0 TPD HOLES

(please log in)

RF450X275M

$165.70

DN63CF (114.30 mm OD)

DN50CF (85.73 mm OD)

Zero-Length Reducer

304L SS

50.800

17.272

92.151

8.433

72.390

M8 X 1.25P

REDUCING FLANGE,Z-L,4-1/2"OD TPD X 3-3/8"OD TPD M8 METRIC

(please log in)

RF450X337M

P.O.R.

DN100CF (152.40 mm OD)

DN16CF (33.78 mm OD)

Zero-Length Reducer

304L SS

15.748

19.812

130.251

8.433

26.975

M4 X 0.7P

REDUCING FLANGE,6"OD X 1-1/3" FLANGE,M4 X 0.7 TPD HOLES

(please log in)

RF600X133M

$147.00

DN100CF (152.40 mm OD)

DN35CF-DN40CF (69.85 mm OD)

Zero-Length Reducer

304L SS

38.100

19.812

130.251

8.433

58.725

M6 X 1.0P

REDUCING FLANGE,6"OD X 2-3/4" FLANGE,M6 X 1.0 TAPPED HOLES

(please log in)

RF600X275M

$211.55

DN125CF (171.45 mm OD)

DN35CF-DN40CF (69.85 mm OD)

Zero-Length Reducer

304L SS

38.100

21.336

151.612

8.433

58.725

M6 X 1.0P

REDUCING FLG,6-3/4"OD X 2-3/4" M6X1.0 TPD HLS

(please log in)

RF675X275M

P.O.R.

DN125CF (171.45 mm OD)

DN63CF (114.30 mm OD)

Zero-Length Reducer

304L SS

63.500

19.812

151.612

8.433

92.151

M8 X 1.25P

REDUCING FLANGE,UHV,6.75"OD X 4.50"FLANGE,METRIC TAPPED

(please log in)

RF675X450M

P.O.R.

DN160CF (203.20 mm OD)

DN16CF (33.78 mm OD)

Zero-Length Reducer

304L SS

152.400

22.352

181.051

8.433

26.975

M4 X 0.7P

REDUCING FLANGE, 8" OD X 1.33" FLANGE, METRIC TAPPED

(please log in)

RF800X133M

P.O.R.

DN160CF (203.20 mm OD)

DN35CF-DN40CF (69.85 mm OD)

Zero-Length Reducer

304L SS

38.100

22.352

181.051

8.433

58.725

M6 X 1.0P

REDUCING FLANGE,8"OD X 2-3/4" FLANGE,M6 X 1.0 TPD HOLES

(please log in)

RF800X275M

$300.00

DN160CF (203.20 mm OD)

DN63CF (114.30 mm OD)

Zero-Length Reducer

304L SS

63.500

22.352

181.051

8.433

92.151

M8 X 1.25P

REDUCING FLANGE,8"OD X 4-1/2" M8 X 1.25 TPD HOLES

(please log in)

RF800X450M

$295.00

DN160CF (203.20 mm OD)

DN100CF (152.40 mm OD)

Zero-Length Reducer

304L SS

101.600

22.352

181.051

8.433

130.251

M8 X 1.25P

REDUCING FLANGE, 8"OD X 6"FLG, M8 X 1.25 TAPPED HOLES

(please log in)

RF800X600M

$390.00

DN100CF (152.40 mm OD)

DN63CF (114.30 mm OD)

Zero-Length Reducer

304L SS

63.500

19.812

130.251

8.433

92.151

M8 X 1.25P

REDUCING FLANGE, 6" OD X 4-1/2 FLG, M8 X 1.25 TAPPED HOLES

(please log in)

RF600X450M

$267.50

Flange Selection Guide

With a variety of flanges to choose from, the Flange Selection Guide is designed to help you find one to meet your vacuum requirements. Shop Now!
Can't find the flange you need or want a custom configuration? Please call us at +1 800 245 1656 or email salesus@lesker.com with your inquiry.

Accessories Table

Description

For

Per Package

Manual

VacuCAD^SM

Part Number

Price

In Stock

Add Item

Description

For

Per Package

Manual

VacuCAD^SM

Part Number

Price

In Stock

Add Item

Gasket, Copper, DN16CF (1.33" OD) Flange , 0.837" OD, 0.640" ID, (10) Per Package

All 1-1/3" (DN16CF) Flanges

—

(please log in)

GA-0133

$26.35

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

—

(please log in)

HBSM6X35

$17.70

Gasket, Copper, DN35CF-DN40CF (2.75" OD) Flange, 1.895" OD, 1.451" ID, (10) Per Package

All 2-3/4" (DN35-DN40CF) Flanges

—

(please log in)

GA-0275

$34.40

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

—

(please log in)

GA-0275LB

$34.50

Gasket, Copper, DN63CF (4.50" OD) Flange, 3.243" OD, 2.506" ID, (10) Per Package

All 4-1/2" (DN63CF) Flanges

—

(please log in)

GA-0450

$58.90

Hex Bolt, Nut & Washer Set, Stainless Steel, (25) M8 x 45mm Bolts, (25) Hex Nuts, & (50) Washers

4-1/2" (DN63CF) Larger CF Flange

—

(please log in)

HBSM8X45

$34.20

Gasket, Copper, DN100CF (6.00" OD) Flange, 4.743" OD,4.006" ID, (10) Per Package

All 6" (DN100CF) Flanges

—

(please log in)

GA-0600

$75.80

Hex Bolt, Nut & Washer Set, Stainless Steel, (25) M8 x 45mm Bolts, (25) Hex Nuts, & (50) Washers

4-5/8" (DN75CF) Larger CF Flange

—

(please log in)

HBSM8X45

$34.20

Gasket, Copper, DN160CF (8.00" OD) Flange, 6.743" OD, 6.007" ID, (10) Per Package

All 8" (DN160CF) Flanges

—

(please log in)

GA-0800

$105.30

M8—1.25 x 50 MM Reducer Bolt Set

6" (DN100CF) Larger CF Flange

—

N/A

HBSM8X35

P.O.R.

Gasket, Copper, DN250CF (12.00" OD) Flange, 10.743" OD x 10.007" ID, (1) Per Package

All 12"(DN250) CF Flanges

—

(please log in)

GA-1200

$79.50

Gasket, Copper, DN275CF (13.25" OD) Flange, 11.590" OD, 10.845" ID, (1) Per Package

All 13-1/4" CF Flanges

—

(please log in)

GA-1325

$69.45

M8—1.25 x 50 MM Reducer Bolt Set

6-3/4" (DN125CF) Larger CF Flange

—

N/A

HBSM8X35

P.O.R.

M8—1.25 x 50 MM Reducer Bolt Set

8" (DN160CF) Larger CF Flange

—

N/A

HBSM8X35

P.O.R.

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

—

(please log in)

HBSM8X60

$44.25

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

—

N/A

HBS31224300

$50.25

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

—

N/A

SBKM4X16S4-25

P.O.R.

M8—1.25 x 30 MM Reducer Bolt Set

3-3/8" (DN50CF) Smaller CF Flange

—

N/A

HBKM8X30

$25.00