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

Standard Series NFT-***-B***

This is a flange-less type, which is directly fit into a chamber wall and sealed with an O-ring.

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

NFT-010-B NFT-012-B NFT-015-B NFT-020-B NFT-025-B NFT-030-B NFT-040-B NFT-050-B NFT-075-B
Inquiry Inquiry Inquiry Inquiry Inquiry Inquiry Inquiry Inquiry Inquiry Inquiry
A [mm] 10H7+0.015
0
12H7+0.018
0
15H7+0.018
0
20H7+0.021
0
25H7+0.021
0
30H7+0.021
0
40H7+0.025
0
50H7+0.025
0
75H7+0.030
0
B [mm] 60 60 69 63 65 71 72 84 94
D [mm] 58 58 67 61 63 69 70 82 92
E [mm] 40g6-0.009
-0.025
40g6-0.009
-0.025
49g6-0.009
-0.025
55g6-0.010
-0.029
63g6-0.010
-0.029
73g6-0.010
-0.029
83g6-0.012
-0.034
95g6-0.012
-0.034
126g6-0.014
-0.039
O1 (O-ring used) S36 S36 S45 S50 S60 S70 S80 S90 S120
O2 (O-ring used) S30 S30 S38 S44 S50 S60 G70 G80 G110
O3 (O-ring used) S10 S12 S15 S20 S25 S30 S40 S50 S75
P [mm] 17 17 20 30 35 40 50 60 90
Q1 [mm] 6 6 6 7 7 8 9 9 10
Q2 [mm] 8 8 9 9 10 11 11 11 14
Q3 [mm] 7 7 7 8 8 9 10 10 11
Q4 [mm] 9 9 10 10 11 12 12 12 15
Shaft option Clamp Clamp Clamp Clamp Clamp Clamp Clamp Clamp Clamp
W [mm] 11 11 11 13 15 15 15 15 19
X [mm] 35 37 40 45 57 61 73 83 109
Y (hexagon socket head bolt) M4×10 M4×10 M4×10 M4×10 M6×12 M6×12 M6×16 M6×16 M8×20
Max. rotation rate [rpm] (*1) (*2) 2200 2200 1900 1300 1100 1000 800 600 400
Rated rotation rate [rpm] (*1) (*3) 2200 2200 1900 1300 1100 1000 800 600 400
Allowable axial load [N]
(*4)
252 252 390 300 440 550 580 810 800
Allowable radial load [N]
(*5)
252 252 390 300 440 550 580 810 800
Mass [kg] 0.5 0.5 0.8 1.0 1.3 1.9 2.3 3.3 5.8
Starting torque [N∙m]
(*1) (*6)
0.1 0.1 0.14 0.32 0.43 0.56 0.88 1.3 2.8
Recommended shaft diameter [mm]
(*4)
10f7-0.013
-0.028
12f7-0.016
-0.034
15f7-0.016
-0.034
20f7-0.020
-0.041
25f7-0.020
-0.041
30f7-0.020
-0.041
40f7-0.025
-0.050
50f7-0.025
-0.050
75f6-0.030
-0.049
Recommended housing diameter [mm]
(*4)
40H7+0.025
0
40H7+0.025
0
49H7+0.025
0
55H7+0.030
0
63H7+0.030
0
73H7+0.030
0
83H7+0.035
0
95H7+0.035
0
126H7+0.040
0
  • (*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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