Rotary feedthroughs with highly variable ALMA flange and short hollow shaft

For high transmittable torque
A wide variety of connection options
Compact design

These rotary feedthroughs guarantee maximum flexibility when connecting your attachments in a vacuum. Media can be conducted through the hollow shaft, e.g. hoses or cables.

The short shaft end on the vacuum side is equipped with a flange connection with two centering options. To connect the driven components, two different thread sizes are available on one pitch circle diameter.

On the atmospheric side of the rotary feedthrough housing there is a pitch circle with mounting threads for add-on components such as torque brackets, motor adapter flanges, etc.

Technical data

Leakage rate: < 1 x 10^-8 mbar x l/s
Operating temp., non-cooled: -20 bis 90 °C
Operating temperature, cooled: > 90 °C
Rotational speed: up to 4,000 rpm
Torque: up to 400 Nm
Pressure differential: up to 1 bar
Vacuum range: up to UHV
Hollow shaft, internal dia.: up to 25 mm
Flange diameter: up to 130 mm
Radial load: up to 400 N
Axial load: up to 300 N
Housing: Stainless steel
Shaft: Stainless steel, magnetic
Magnetic fluid: Maintenance-free

Available options

• Housing cooling
• Customer-specific versions

Model	ALMA-H-AF-008-A-U
Part number	1020635
Weight (kg)	1.500
Dimensions (mm)
Internal diameter, hollow shaft [T]	8.0
Shaft diameter, vacuum side [Kg6]	44.0
Shaft diameter, atmospheric side [Pg6]	44.0
Shoulder diameter, atmospheric side [R]	15.0
Internal dia. of the shaft fit, vacuum side [LG6]	16.0
Centering depth shaft [M]	3.0
Total length [A]	100.0
Length, atmospheric side [F+G+H]	66.0
Length, vacuum side [D±0,05]	34.0
Total housing length [E+F+G]	75.0
Housing length, vacuum side [E]	30.0
Housing length, atmospheric side [F+G]	45.0
Housing fit diameter, vacuum side [Ng7]	54.0
Housing diameter, vacuum side [J0 -0,05]	53.95
Housing diameter, atmospheric side [Sg7]	58.0
Flange diameter [Ig7]	80.0
Flange length [F]	15.0
Pitch circle diameter [U]	50±0,10
Pitch circle diameter [V]	72±0,10
Pitch circle diameter [W]	36±0,10
Tapped through-hole (Ø) [A1]	M5 (6x)
Tapped hole (ØxT) [A2]	M4 x 8 (6x)
Through-hole (Ø) [A3]	5.5 (6x)
Tapped holeg (ØxT) [A4]	M5 x 6 (6x)
Tapped hole (ØxT) [A5]	M4 x 6 (6x)
Shaft specification
Max. rotational speed	4,000 min-1
Max. transmittable torque*	30.00 Nm
Friction torque	0.45 Nm
Max. axial load [Fa1]**	300 N
Max. axial load [Fa2]**	300 N
Max. radial load [Fr1]**	300 N
Max. radial load [Fr2]**	300 N

ALMA-H-AF-010-A-U
1019200
3.000
10.0
60.0
60.0
24.00-0,05
20.0
5.0
126.0
86.0
40.0
87.0
35.0
52.0
70.0
69.95
70.0
100.0
17.0
61±0,10
88±0,10
50±0,10
M6 (6x)
M5 x 10 (6x)
7 (6x)
M6 x 8 (6x)
M5 x 8 (6x)
2,000 min-1
70.00 Nm
0.5 Nm
300 N
300 N
300 N
300 N

ALMA-H-AF-015-A-U
1039772
4.700
15.0
64.0
64.0
22g6
20.0
5.0
166.0
122.0
44.0
110.0
35.0
75.0
75.0
74.950-0,05
80.0
115.0
25.0
65±0,10
103±0,10
55±0,10
M6 (6x)
M6 x 12 (6x)
7 (6x)
M5 x 11 (6x)
M4 x 11 (6x)
200-2,000 min-1
80.00 Nm
300 N
150 N
300 N
300 N

ALMA-H-AF-020-A-U
1027453
5.200
20.0
69.0
69.0
28g6
25.0
5.0
172.0
128.0
44.0
110.0
35.0
75.0
80.0
79.950-0,05
88.0
120.0
25.0
75±0,10
108±0,10
60±0,10
M6 (6x)
M6 x 12 (6x)
7 (6x)
M6 x 11 (6x)
M5 x 11 (6x)
200-2,000 min-1
150.00 Nm
300 N
150 N
350 N
350 N

ALMA-H-AF-025-A-U
1022452
6.500
25.0
79.0
79.0
38g6
30.0
5.0
180.0
136.0
44.0
110.0
35.0
75.0
90.0
89.950-0,05
98.0
130.0
25.0
85±0,10
118±0,10
70±0,10
M6 (6x)
M6 x 12 (6x)
7 (6x)
M6 x 11 (6x)
M5 x 11 (6x)
200-2,000 min-1
400.00 Nm
300 N
150 N
400 N
400 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.