Standard Series FMB-***-B (φ8mm or less)
Solid shaft (equipped with shaft)Shaft diameter ：5Shaft diameter ：6Shaft diameter ：8Shaft diameter ：4Bearing arrangement ：Standard (Both sides)Water cooling：No water cooling
Round straightFlat cut
Round straightFlat cut
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.
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|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)|
|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|
|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
|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|
|Pole piece||SUS 630|
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.