Howden ELF - Overview Tightening Torques

Howden 24-07.030r04 23/25
E-series Axial Flow Cooling Fans
Service Manual
VIII. OVERVIEW TIGHTENING TORQUES
Torque values for impeller hardware
Class 8.8 (A3B)
A2, St8
A4
Application
Bolts size
Nm
lb
.
ft
Nm
lb
.
ft
Nm
lb
.
ft
Tapered bushing
5/16” (P2)
22
16
3/8” (Q2, R2)
39
29
1/2” (S1)
95
70
5/8” (U1)
190
140
3/4” (W1, W2)
339
250
Coupling flange
bolts*
M12
75
55
75
55
M16
185
136
185
136
M20
360
266
360
266
M24
625
461
625
461
M30
1260
929
1260
929
M42
2600
1918
2600
1918
M48
5500
4057
5500
4057
U-bolts*
M12
60
44
60
44
M16
140
103
140
103
M20
250
184
250
184
M24
425
313
380
280
M30
650
479
500
369
M36
1100
811
970
715
M42
1300
959
-
-
Table 6
*(See hardware overview table 8 on page 23 for correct bolt size)
Torque values for retaining plate bolt
Class 8.8 / A4
Retaining plate
[mm] / [inch]
Thread
Size
Nm
lb
.
ft
79 mm / 3.11“
M10
48
35
M12
85
63
M16
150
110
M20
195
144
189 mm / 7.44”
M16
200
148
M20
245
181
M24
300
221
240 mm / 9.45”
M24
540
398
M30
700
516
360 mm / 14.17”
M30
850
627
Table 7