Dimensions, P/N System & Bolts
Multi-CF™ Flange Dimensions (A comparison of Multi-CFTM sizes vs. standard Conflat* sizes.)
NOTE: All Kimball Physics Multi-CF™ flange fittings are compatible with industry-standard ConFlat* flanges.
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| Nominal Size |
Conflat* Outside Dia |
Multi-Cf Outside Dia. |
Conflat Bore Dia. |
Multi-Cf Bore Dia. |
Conflat Gasket I.D. |
Multi-Cf Gasket I.D. |
Conflat Thickness |
Recess Dia |
Knife Edge Dia. |
Bolt Circle Dia. |
Conflat Number Of Holes** |
Multi-Cf Number Of Holes** |
Bolt Hole Dia. |
Threaded Hole |
n |
| 1.33"CF |
1.33" |
same |
0.625" |
0.640" |
0.640" |
0.640" |
0.285" |
0.840" |
0.720" |
1.062" |
6 |
6/12 |
0.172" |
8-32 |
0 |
| 2.12"CF |
This size not currently offered. |
| 2.75"CF |
2.73" |
same |
1.375" |
1.500" |
1.451" |
1.510" |
0.500" |
1.900" |
1.650" |
2.312" |
6 |
6/12 |
0.265" |
1/4-28 |
2 |
| 3.38"CF |
This size not currently offered. |
| 4.50"CF |
4.47" |
4.13" |
2.375" |
2.900" |
2.506" |
2.910" |
0.680" |
3.250" |
3.040" |
3.628" |
8 |
8/16 |
0.332" |
5/16-24 |
4 |
| 6.00"CF |
5.97" |
same |
3.812" |
4.300" |
4.010" |
4.310" |
0.840" |
4.750" |
4.540" |
5.128" |
16 |
16/32 |
0.332" |
5/16-25 |
6 |
| 8.00"CF |
7.97" |
same |
5.812" |
6.300" |
6.007" |
6.310" |
0.940" |
6.750" |
6.540" |
7.128" |
20 |
20/40 |
0.332" |
5/16-26 |
-- |
| 10.00"CF |
9.97" |
same |
7.875" |
8.300" |
8.007" |
8.310" |
0.970" |
8.750" |
8.540" |
9.128" |
24 |
24/48 |
0.332" |
5/16-26 |
-- |
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Multi-CF™Numbering Sysem and Abbreviations
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| MCFXXX - YY(V.VV) - ZZZZ - UUUU - W |
| Note: (V.VV) is not shown below; it is the outside diameter for Magdeburge spheres. W is also not shown below; it is the Design Revision which is laser marked on the actual part. |
| MCFXXX = |
YY = |
ZZZZ = |
| Largest Port Size |
Multi-CF Part Type Abbreviations |
Flange sizes and # Ports |
| 133 = 1.33" CF |
| 212 = 2.12" CF** |
| 275 = 2.75" CF |
| 338 = 3.38" CF** |
| 450 = 4.50" CF |
| 600 = 6.00" CF |
| 800 = 8.00" CF |
| 1000 = 10.00" CF |
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| ** Note, these sizes are not currently offered. |
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| Spherical Cube |
SphCube |
| Spherical Triangle |
SphTri |
| Spherical Square |
SphSq |
| Spherical Hexagon |
SphHex |
| Spherical Octagon |
SphOct |
| Spherical Hexadecagon |
SphHexadecagon |
| Spherical Pentagon |
SphPent |
| Spherical Decagon |
SphDec |
| Extended Octagon |
ExtOct |
| Magdeburg Sphere |
MagdeSph |
| Magdeburg Hemisphere |
MagdeHSph(OD) |
| Partial Magdeburg Sphere |
MagdePSph |
| Flange Multiplexer |
FlgMplxr |
| Test Flange Multiplexer |
TestFlgMplxr |
| Weldable Cluster |
WeldClstr |
| Close Coupler |
ClsCplr |
| Groove Grabber |
GrvGrb |
| Grabber Groove |
GrbGrv |
| Custom Design |
Cust |
| Perimeter Weld Flange |
PWeldFlg |
| Thin Flange |
ThnFlg |
| Flange Cross |
FlgCross |
| Flange Blank |
FlgBlank |
| Flange Tube OD |
FlgXXXX |
| Flange Adaptor |
FlgAdptr |
| Mounting Flange |
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MtgFlg |
(for Mounting Flanges: Blank = Blk, View Port = VP,
Double Sided 2.75CF = C2)
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| Flange sizes are represented by letters. |
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| The number of ports of a certain size immediately follow the letter. |
| Letter |
Flange Size |
| A |
1.33" |
| B |
2.12" |
| C |
2.75" |
| D |
3.38" |
| E |
4.50" |
| F |
6.00" |
| G |
8.00" |
| H |
10.00" |
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| Additional Conventions |
| A small "r" after the letter designates a rotatable flange. |
| A small "c" after the letter designates clear bolt holes. |
| A small "i" after the letter designates an irregular bolt pattern. |
| A small "e" after the letter designates an extended flange. |
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| Examples |
| “Cr1”: (1) 2.75" rotatable CF Flange |
| “C2r1”: (2) 2.75" non-rotatable and (1) rotatable flange |
| “Cc1”: (1) 2.75" CF Flange with clear bolt holes |
| “C2c1”: (2) 2.75" CF w tapped bolt holes and (1) w clear holes |
| “C2i1”: (2) std 2.75" CF with tapped holes & (1) with an irregular bolt pattern |
| “MCF800M-“ : The “M” designates a chamber with metric tapped holes. |
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Example: MCF600-SphSq-F2C4A8
1. The largest port is a 6 CF flange, so the part number starts with MCF600.
2. It is a Spherical Square (SphSq).
3. The port sizes are represented by F2C4A8, because it has two 6.00"CF flanges, four 2.75"CF flanges and eight 1.33"CF flanges.
Note, not all system abbreviation conventions are applicable to all fittings; see part drawings.
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Multi-CF Fitting Bolt Requirements
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Tapped Multi-CFTM Bolt Requirements
When used with industry standard Conflat flange hardware |
Close Coupler Bolt Requirements |
| Port Size |
Quantity |
Bolt Size |
Model # |
Qauntity |
Bolt Size |
| MCF133 port |
6 |
8-32 x 1/2 |
MCF133-ClsCplr-A2* |
12 |
8-32 x 1/4 (0.25") |
| MCF212 port |
This size not currently offered. |
MCF275-ClsCplr-C2-700* |
12 |
1/4 - 28 x 1/2 (0.50") |
| MCF275 port |
6 |
1/4-28 x 7/8 |
MCF275-ClsCplr-C2-1400 |
12 |
1/4 - 28 x 7/8 (0.875") |
| MCF338 port |
This size not currently offered. |
MCF275-ClsCplr-C1r1 |
12 |
1/4 - 28 x 1/2 (0.50") |
| MCF450 port |
8 |
5/16-24 x 1 1/4 |
MCF450-ClsCplr-E2 |
16 |
5/16-24 x 3/4 (0.75") |
| MCF600 port |
16 |
5/16-24 x 1 1/4 |
MCF450-ClsCplr-E1r1 |
16 |
5/16-24 x 3/4 (0.75") |
| MCF800 port |
20 |
5/16-24 x 1 1/4 |
MCF600-ClsCplr-F1r1 |
32 |
5/16-24 x 3/4 (0.75") |
| MCF1000 port |
24 |
5/16-24 x 1 1/2 |
MCF800-ClsCplr-G1r1 |
40 |
5/16-24 x 3/4 (0.75") |
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Caution: Always use silver plated bolts of the correct length, or damage may occur! Never use damaged bolts!
Silver plated bolt sizes listed are available through Kimball Physics Inc. and Duniway Stockroom Corp. (800) 446-8811.
* The Conflat flange was invented by Bill Wheeler at Varian Associates Vacuum Division (now Agilent Technologies); Conflat is a registered trademark of Varian, Inc.
Multi-CFTM Line Patents: The Multi-CF line is covered by Kimball Physics Inc. patents: 5,593,123; 5,625,947; 5,660,418; 5,671,956, 6,270,045. Additional patents pending.
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