SIEMENS
1/10
Siemens MD 50.8 · 2017
Introduction
Guidelines for selection and ordering
Notes on dimensional drawings
1
■
Overview
Standards
Designs according to AGMA available on request.
Shaft heights
DIN 747 shaft heights for machines
Note:
For foot-mounted gearboxes, the mounted motor can extend
below the mounting surface of the gearbox.
Shaft extensions
DIN 748-1 cylindrical shaft extensions
Diameter tolerance:
Centering holes according to DIN 332, form DR:
Undercut according to DIN 509:
Flanges
Centering edge tolerance:
Vent valves
The gearboxes are shown in the dimensional drawings with
screw plugs.
If venting is required, then depending on the type of
construction, an activated vent valve is installed.
The contour dimension can change slightly as a result.
Fig. 1/5
Example, dimensional drawings
DIN/ISO
DIN 743
Output shafts
ISO 281, ISO 76
Bearings
DIN 7190
Interference fits
DIN 6892
Parallel key connection
DIN 3991
Bevel gear toothing
Shaft height
Tolerance
mm
mm
250
-0.5
Diameter
Tolerance
mm
mm
50
ISO k6
> 50
ISO m6
Diameter
Thread size
mm
-
> 24 … 30
M10
> 30 … 38
M12
> 38 … 50
M16
> 50 … 85
M20
Diameter
Undercut
acc. to DIN 509
Suggested construction,
minimum hollow on mating piece
mm
mm
> 16 … 18
E1.0x0.2
0.9 x 45 °
> 18 … 50
E1.2x0.2
1.1 x 45 °
> 50 … 80
E1.6x0.3
1.4 x 45 °
> 80 … 125
E2.5x0.4
2.2 x 45 °
Outer flange diameter
Tolerance
mm
mm
300
ISO j6
350
ISO h6
BHZ29
4
4
5
1
2
3
ØAC
66,5
k
kB
LB
LBL
114,5
60
78
DR M10x22
74
29,6
52
98,5
□ 85
M8x14
45°
4x90°
50
4
Ø95
AD
125
88
10
10
19
67
47,8
Ø74 j6
130
Ø12
8
28
28
3
35
Ø25 k6
35
Ø25 k6
DR M10x22
Ø25 k6
Ø73,9
130,5
104
140
39°
6°
120
Ø60
© Siemens AG 2017