6.5. SECURING OF SOLID SHAFT GEAR UNITS
The gear unit must be mounted onto a rigid and stable bedplate or foundation in order to avoid vibrations and
possible overload of the housing fixation pads.
Use the fixation holes indicated on the dimensional drawing.
After correct alignment and shimming of all the points, fix the gear unit solidly onto its foundation with the
appropriate size steel bolts, grade 8.8 according to DIN 267 or SAE grade 5 for steel bolts 1 1/2" and smaller,
ASTM.A-354 grade BC for steel bolts larger than 1 1/2", and grade 80 according to DIN 267 for stainless steel
bolts. Dimensions and tightening torques: see tables.
Note: for some horizontal executions with parallel shaft and fans, the protection hood of the fan must be
removed to enable tightening of the bolts. Remount the protection hood afterwards.
6.5.1. Tightening torques for steel bolts grade 8.8
Horizontal mount
- Single stage gear units (type QHP.1)
- Multi stage gear units (type QH...)
Vertical mount
- Multi stage gear units (type QV...)
(1) size G : 2-stage unit
(2) size G : 3- and 4-stage unit
ENGLISH
Gear unit size CDE FG
Bolt size
Grade 8.8
Tightening torque
ISO
Nm
M20
335
M24
675
M24
675
M30
1350
M30
1350
Bolt size
Grade 5
Tightening torque
UNC
lbf.in
3/4"
2950
7/8"
4850
1"
6000
1 1/8"
10300
1 1/4"
12000
Gear unit size A B C D E-F G-H-J-K L-M N-P-Q R-S-T
Bolt size
Grade 8.8
Tightening torque
ISO
Nm
M16
180
M20
335
M24
675
M24
675
M30
1350
M36
2350
M42
3800
M48
5700
M56
9150
Bolt size
Grade 5 /Grade BC
Tightening torque
UNC
lbf.in
5/8"
1550
3/4"
2950
7/8"
4850
1"
6000
1 1/4"
12000
1 1/2"
21000
1 3/4"
33650
2"
50750
2 1/4"
81050
Gear unit size A B C D E F-G(1) G(2)-H-J-K L-M-N-P-Q R-S-T
Bolt size
Grade 8.8
Tightening torque
ISO
Nm
M16
180
M20
335
M24
675
M30
1350
M30
1350
M36
2350
M42
3800
M48
5700
M56
9150
Bolt size
Grade 5 /Grade BC
Tightening torque
UNC
lbf.in
5/8"
1550
3/4"
2950
1"
6000
1 1/8"
10300
1 1/4"
12000
1 1/2"
21000
1 3/4"
33650
2"
50750
2 1/4"
81050
20
19
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