Rotary feedthroughs for very high axial loads, with ALMA flange and short solid shaft

For very high axial loads
For high transmittable torque
A wide variety of connection options

These rotary feedthroughs are ideal for applications involving high axial loads combined with low rotational speeds and high output torques.

The figures given are approximate values, which can change if one of the other parameters varies. In this case, we will recalculate these figures according to your specification.

The ALMA flange has a highly flexible mounting geometry for both the substrate carrier on the vacuum side and the drive design on the atmospheric side.

Technical data

Leakage rate: < 1 x 10-8 mbar x l/s
Operating temp., non-cooled: -20 bis 60 °C
Operating temperature, cooled: > 90 °C
Rotational speed: up to 300 rpm
Torque: up to 1,200 Nm
Pressure differential: up to 1 bar
Vacuum range: up to UHV
Shaft diameter: up to 130 mm
Flange diameter: up to 198 mm
Radial load: up to 500 N
Axial load: up to 10,000 N
Housing: Stainless steel
Shaft: Stainless steel, magnetic
Magnetic fluid: Maintenance-free

Available options

  • Housing cooling
  • Customer-specific versions


ModelALMA-M-AF-080-A-U
Part number 1023751
Weight (kg) 11.500
Dimensions (mm)
Shaft diameter, vacuum side [Ng7] 80.0
Shaft diameter, atmospheric side [Tg7] 40.0
Internal dia. of the shaft fit, vacuum side [pG7] 36.0
Total length [G] 180.0
Length, atmospheric side [H] 140.0
Length, vacuum side [I] 40.0
Total housing length [J+60.0] 129.0
Housing length, atmospheric side [J] 69.0
Housing fit diameter, vacuum side [Lg7] 100.0
Housing diameter, vacuum side [M] 98.0
Housing diameter, atmospheric side [Rg7] 116.0
Flange diameter [K] 140.0
Flange length 30.0
Shaft nut diameter [S] 91.0
O-ring diameter [D] 114.0
Available mounting surface [E] 91.0
Available mounting surface [F] 116.0
Pitch circle diameter [W] 128±0,10
Pitch circle diameter [X] 68±0,10
Pitch circle diameter [Z] 103.0
Through-hole (Ø) [A1] 7 (6x)
Tapped through-hole (Ø x T) [A2] M6 x 11 (6x)
Shaft specification
Max. rotational speed 300 min-1
Max. transmittable torque* 200.00 Nm
Friction torque 3 Nm
Max. axial load [Fa1]** 3.000 N
Max. axial load [Fa2]** 3.000 N
Max. radial load [Fr1]** 500 N
Max. radial load [Fr2]** 500 N
ALMA-M-AF-110-A-U
1023752
23.000
 
110.0
55.0
51.0
212.0
168.0
44.0
157.0
97.0
125.0
123.0
142.0
178.0
30.0
116.0
139.0
116.0
142.0
160±0,10
95±0,10
128.0
9 (8x)
M8 x 15 (8x)
 
300 min-1
450.00 Nm
4 Nm
7.000 N
7.000 N
500 N
500 N
ALMA-M-AF-130-A-U
1039776
33.000
 
130.0
75.0
66.0
244.0
197.0
47.0
186.0
126.0
145.0
143.0
162.0
198.0
30.0
131.0
159.0
131.0
162.0
180±0,10
113±0,10
145±0,10
9 (8x)
M8 x 18 (8x)
 
300 min-1
1.200,00 Nm
8 Nm
10.000 N
10.000 N
500 N
500 N
*  The torque calculation is based on mean calculated values.
** The load calculation is based on assumed values, which cover 95 % of applications.
    Individual calculations can be made for borderline applications.