Welcome to the Kurt J. Lesker Company.  

Sign In | Register

Current Region: International (Change) | Contact Us |   RSS   Twitter   LinkedIn   YouTube

Close

Please select your country or region to be
directed to the appropriate Lesker site.

Flanges & Components > ConFlat (CF) Flanges & Components > Zero-Length Reducer Flanges

Zero- Length Reducer 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
  • The maximum I.D. of the small flange limits the bore

NOTE:

  • Flanges listed below with the nominal O.D. of the smaller flange given first. (The combination's "true" O.D. is that of the larger flange.) The part number is the flange diameter expressed as decimal numbers, giving the large flange first.
  • TH ≡ Through Hole
  • Both sets of bolt holes are tapped. The smaller thread size applies to the smaller flange mounting where applicable.

ISO Standard Our CF Flanges and Gaskets are compatible to the ISO Standard 3669-2 Specification.

Dimensional Drawings

Got VacuCADSM?
VacuCAD is a free library containing thousands of 2D CAD drawings (in DXF format) and 3D Models (in STP format) for many of our standard vacuum components and chambers. Please Log in

Ordering Table

(Click column headers to sort data)

Flange
Size/OD
(large)
Flange
Size/OD
Bore Flange
Thickness
Flange Thread
(Small / Large)
Weight
lbs
PartNo Price Add Item
VacuCADSM
Flange
Size/OD
(large)
Flange
Size/OD
Bore Flange
Thickness
Flange Thread
(Small / Large)
Weight
lbs
PartNo Price Add Item
VacuCADSM
10" 2-3/4" 1.5 0.97 M6 X 1.0/TH 20
RF1000X275M
$536.00
(please log in)
10" 4-1/2" 2.5 0.97 M8 X 1.25/TH 18.5
RF1000X450M
$500.00
(please log in)
10" 6" 4 0.97 M8 X 1.25/TH 17
RF1000X600M
$557.00
(please log in)
10" 8" 6 0.97 M8 X 1.25/TH 15.5
RF1000X800M
$557.00
(please log in)
13-1/4" CF 10" 8 1.12 M8 X 1.25/TH 30
RF1325X1000M
P.O.R.
(please log in)
2-3/4" 1-1/3" 0.62 0.5 M4 X 0.7/TH 0.75
RF275X133M
$110.00
(please log in)
4-1/2" 2-3/4" 1.5 0.68 M6 X 1.0/TH 2.5
RF450X275M
$130.00
(please log in)
4-1/2" 3-3/8" 2 0.68 M8 X 1.25/TH 2.5
RF450X337M
P.O.R.
(please log in)
6" 1-1/3" 0.62 0.78 M4 X 0.7/TH 6
RF600X133M
$180.00
(please log in)
6" 2-3/4" 1.5 0.78 M6 X 1.0/TH 5.5
RF600X275M
$165.00
(please log in)
6-3/4" 2-3/4" 1.5 0.84 M6 X 1.0/TH 7.5
RF675X275M
$260.00
(please log in)
6-3/4" 4-1/2" 2.5 0.78 M8 X 1.25/TH 4.5
RF675X450M
P.O.R.
(please log in)
8" 1-1/3" 6 0.88 M4 X 0.7/TH 12
RF800X133M
P.O.R.
(please log in)
8" 2-3/4" 1.5 0.88 M6 X 1.0/TH 11.5
RF800X275M
$280.00
(please log in)
8" 4-1/2" 2.5 0.88 M8 X 1.25/TH 10.5
RF800X450M
$195.00
(please log in)
8" 6" 4 0.88 M8 X 1.25/TH 8.5
RF800X600M
$290.00
(please log in)
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 1-412-387-9200 or email international@lesker.com with your inquiry.

Accessories Table

Description For Per Package Weight lbs (kg) Manual PartNo Price Add Item
VacuCADSM
Description For Per Package Weight lbs (kg) Manual PartNo Price Add Item
VacuCADSM
1/4 Hard OFHC Copper Gasket
All 1-1/3" (DN16CF) Flanges
10
1/4 (0.11)
--
GA-0133
$20.90
(please log in)
1/4 Hard OFHC Copper Gasket
All 2-1/8" (DN25CF) Flanges
10
1/4 (0.11)
--
GA-0212
$23.90
(please log in)
1/4 Hard OFHC Copper Gasket
All 2-3/4" (DN35-DN40CF) Flanges
10
1/4 (0.11)
--
GA-0275
$27.20
(please log in)
1/4 Hard, 1.53" I.D.* OFHC Copper Gasket
All 2-3/4" (DN35-DN40CF) Flanges
10
1/4 (0.11)
--
GA-0275LB
$27.20
(please log in)
1/4 Hard OFHC Copper Gasket
All 3-3/8" (DN50CF) Flanges
10
1/2 (0.22)
--
GA-0337
$30.90
(please log in)
1/4 Hard OFHC Copper Gasket
All 4-1/2" (DN63CF) Flanges
10
3/4 (0.34)
--
GA-0450
$37.00
(please log in)
1/4 Hard OFHC Copper Gasket
All 4-5/8" (DN75CF) Flanges
10
1 (0.45)
--
GA-0462
$44.00
(please log in)
1/4 Hard OFHC Copper Gasket
All 6" (DN100CF) Flanges
10
1-1/2 (0.68)
--
GA-0600
$55.00
(please log in)
1/4 Hard OFHC Copper Gasket
All 6-3/4" (DN125CF) Flanges
10
1-1/2 (0.68)
--
GA-0675
$66.00
(please log in)
1/4 Hard OFHC Copper Gasket
All 8" (DN160CF) Flanges
10
2 (0.91)
--
GA-0800
$78.00
(please log in)
1/4 Hard OFHC Copper Gasket
All 10" (DN200CF) Flanges
10
3 (1.36)
--
GA-1000
$96.00
(please log in)
1/4 Hard OFHC Copper Gasket
All 12"(DN250) CF Flanges
1
1/4 (0.11)
--
GA-1200
$61.00
(please log in)
1/4 Hard OFHC Copper Gasket
All 13-1/4" CF Flanges
1
1/4 (0.11)
--
GA-1325
$54.00
(please log in)
M6—1.00 x 25 MM Reducer Bolt Set
2-1/8" (DN25CF) and 2-3/4" (DN35-DN40CF) Smaller CF Flange
25
1 (0.45)
--
HBKM6X25
$33.50
(please log in)
M8—1.25 x 30 MM Reducer Bolt Set
3-3/8" (DN50CF) Smaller CF Flange
25
1-1/2 (0.68)
--
HBKM8X30
$12.40
N/A
M8—1.25 x 35 MM Reducer Bolt Set
4-1/2" (DN63CF) Smaller CF Flange
25
1-1/2 (0.68)
--
HBKM8X35
$16.00
(please log in)
M8—1.25 x 35 MM Reducer Bolt Set
4-5/8" (DN75CF) Smaller CF Flange
25
1-1/2 (0.68)
--
HBKM8X35
$16.00
(please log in)
M8—1.25 x 35 MM Reducer Bolt Set
6" (DN100CF) Smaller CF Flange
25
1-1/2 (0.68)
--
HBKM8X35
$16.00
(please log in)
M8—1.25 x 35 MM Reducer Bolt Set
8" (DN160CF) Smaller CF Flange
25
1-1/2 (0.68)
--
HBKM8X35
$16.00
(please log in)
M8—1.25 x 35 MM Reducer Bolt Set
10" (DN200CF) Smaller CF Flange
25
1-1/2 (0.68)
--
HBKM8X35
$16.00
(please log in)
5/16—24 x 3" Reducer Bolt Set
13-1/4" Larger CF Flange
25
2 (0.91)
--
HBS31224300
$50.00
N/A
M6—1.0 x 35 MM Reducer Bolt Set
2-3/4" (DN35-DN40CF) Larger CF Flange
25
1 (0.45)
--
HBSM6X35
$17.60
(please log in)
M8—1.25 x 50 MM Reducer Bolt Set
6" (DN100CF) Larger CF Flange
25
2 (0.91)
--
HBSM8X35
P.O.R.
N/A
M8—1.25 x 50 MM Reducer Bolt Set
6-3/4" (DN125CF) Larger CF Flange
25
2 (0.91)
--
HBSM8X35
P.O.R.
N/A
M8—1.25 x 50 MM Reducer Bolt Set
8" (DN160CF) Larger CF Flange
25
2 (0.91)
--
HBSM8X35
P.O.R.
N/A
M8—1.25 x 45 MM Reducer Bolt Set
4-1/2" (DN63CF) Larger CF Flange
25
2 (0.91)
--
HBSM8X45
$34.00
(please log in)
M8—1.25 x 45 MM Reducer Bolt Set
4-5/8" (DN75CF) Larger CF Flange
25
2 (0.91)
--
HBSM8X45
$34.00
(please log in)
M8—1.25 x 60 MM Reducer Bolt Set
10" (DN200CF) Larger CF Flange
32
2 (0.91)
--
HBSM8X60
$44.00
(please log in)
M4—0.7 x 16 MM Reducer Bolt Set
1-1/3" (DN16CF) Smaller CF Flange
25
1/4 (0.11)
--
SBKM4X16
$9.60
(please log in)
Gasket Clips for CF Flanges
All CF Flanges
10
1/4 (0.11)
Download PDF
VGC0275S
$61.00
N/A
Gasket Removal Tool
All CF Flanges
1
1/4 (0.11)
--
VZGRT
$38.00
N/A
4 oz. Tube Anti-Seize Thread Lube
All CF Flanges
1
1/4 (0.11)
--
VZTL-4OZ
P.O.R.
N/A

ISO:9001 The Kurt J. Lesker Company is an ISO:9001 certified company. Copyright ©1996-2017 Kurt J. Lesker Company® All rights reserved.