New products are available now. These products are compatible with Ferrotec’s seals. Click on the following Cross Reference Sheet.

Standard Series FMB-***-B (φ8mm or less)

This type is based on the F1B type and has a tap hole processed for a motor mount. Motor connection is easy.
Key groove shaft processing is not covered by this specification.

Explanation of the model designation
See the detailed explanation here
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Product Specification

FMB-004-B FMB-005-B FMB-006-B FMB-008-B
Inquiry Inquiry Inquiry Inquiry Inquiry
A [mm] 4g6-0.004
-0.012
5g6-0.004
-0.012
6g6-0.004
-0.012
8g6-0.005
-0.014
B [mm] 60 64 72 85
C [mm] 18 20 22 24
D [mm] 32 32 37 45
E [mm] 35f7-0.025
-0.050
35f7-0.025
-0.050
39f7-0.025
-0.050
48f7-0.025
-0.050
F [mm] 4 4 6 6
H [mm] 29f7-0.020
-0.041
29f7-0.020
-0.041
33f7-0.025
-0.050
42f7-0.025
-0.050
I [mm] 17 17 20 29
J 4-Φ4.5PCD27 4-Φ4.5PCD27 4-Φ4.5PCD31 6-Φ4.5PCD40
K 4-M4PCD22 4-M4PCD22 4-M4PCD25 4-M4PCD34
L [mm] 4 4 5 6
O (O-ring used) P14 P14 P18 G25
Shaft option Flat cut (both ends) Flat cut (both ends) Flat cut (both ends) Flat cut (both ends)
S [mm] 8 10 10 12
V [mm] 0.5 0.5 0.5 1
Max. rotation rate [rpm] (*1) (*2) 7600 7600 6400 4800
Rated rotation rate [rpm] (*1) (*3) 4000 4000 4000 4000
Allowable axial load [N] (*4) 12 22 35 72
Allowable radial load [N] (*5) 12 22 35 72
Mass [kg] 0.09 0.1 0.16 0.34
Starting torque [N∙m] (*1) (*6) 0.009 0.009 0.013 0.022
Allowable transmission torque [N∙m] 0.6 0.7 1.4 3.6
  • (*1): This is the numerical value when a magnetic fluid of standard vacuum specification (A type) is used. The value is different when a magnetic fluid of anti-corrosion specification (F type) or low vapor pressure and anti-corrosion specification (U type) is used.
  • (*2): The allowable rotation rate when no load is applied to the shaft.
  • (*3): The allowable rotation rate when the allowable radial load is applied.
  • (*4): The maximum axial load that can be applied to the center of magnetic fluid seal shaft.
    If the load combined with the radial load is applied, or if the load point is off the center of the shaft, please contact us from the Inquiry Form for the magnetic fluid and describe the load conditions in the form.
  • (*5): The maximum radial load that can be applied to the shaft end of magnetic fluid seal.
    If the load combined with the axial load is applied, or if the load point is far from the shaft end, please contact us from the Inquiry Form for the magnetic fluid and describe the load conditions in the form.
  • (*6): Starting torque is the maximum load torque upon starting of rotation. This is a reference value and not a guaranteed value. Recommended load torque for selecting a motor is about three times as high as the value described above.

Common Specification for Standard Products

Vacuum resistance 1.0x10-6Pa
Leakage rate (He) 9.9×10-11Pa・m3/sec or less
Operating atmosphere (*1) In vacuum / in inert gas / in corrosive gas
Materials used Housing SUS 304
Shaft SUS 630
Pole piece SUS 630
Bearing SUJ2
O-ring FKM
Bearing lubricant Vacuum side: fluorine vacuum grease
Atmosphere side: general-purpose case with rust inhibitor
Standard accessories (*2) O-ring
Washer and nut (LSB Series)
  • (*1): For application with corrosive gases, please specify a magnetic fluid of anti-corrosion specification or low vapor pressure and anti-corrosion specification.
    Also, some gas types and operating conditions require different support. Please contact our sales personnel to inform us of your operating environment.
  • (*2): The size of O-ring supplied is described on the page for details of each model.
    Also, the LSB Series are supplied with mounting washer and nut.
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