78
P1512161 R0
5. Appendix
5.1. Bolt Torque
gives the correct torque values for various hardware. Tighten all bolts to the torque specified, unless
otherwise noted. Check tightness periodically, using
as a guide. Replace the hardware with the same
strength bolt, contact if you are unsure.
Table 40.
Recommended Bolt Torque
a
Size
Dry or
Lubricated
Threads
per inch
(Course/
Fine)
Area of Bolt (sq in.)
Recommended Torque (ft-lb)
Grade 2
Grade 5
Grade 8
8.8 S/S
Coarse
Fine
Coarse
Fine
Coarse
Fine
Coarse
Fine
Coarse
Fine
1/4"
Dry
20/28
0.0318
0.0364
5.5
6.3
8
10
12
14
6.3
7.8
Lubricated
6.3
4.7
6.3
7.2
9
10
-
-
5/16"
Dry
18/24
0.0524
0.058
11
12
17
19
24
27
11
11.8
Lubricated
8
9
13
14
18
20
-
-
3/8"
Dry
16/24
0.0775
0.0878
20
23
30
35
45
50
20
22
Lubricated
15
17
23
25
35
35
-
-
7/16"
Dry
14/20
0.1063
0.1187
32
36
50
55
70
80
31
33
Lubricated
24
27
35
40
50
80
-
-
1/2"
Dry
13/20
0.1419
0.1599
50
55
75
85
110
120
43
45
Lubricated
35
40
55
65
80
90
-
-
9/16"
Dry
12/18
0.182
0.203
70
80
110
120
150
170
57
63
Lubricated
55
60
80
90
110
130
-
-
5/8"
Dry
11/18
0.226
0.256
100
110
150
170
210
240
93
104
Lubricated
75
85
110
130
160
180
-
-
3/4"
Dry
10/16
0.334
0.373
175
200
260
300
380
420
128
124
Lubricated
130
140
200
220
280
310
-
-
7/8"
Dry
9/14
0.462
0.508
170
180
430
470
600
670
194
193
Lubricated
125
140
320
350
180
180
-
-
1"
Dry
8/14
0.606
0.679
250
280
640
720
910
1020
287
289
Lubricated
190
210
480
540
680
760
-
-
1-1/8"
Dry
7/12
0.763
0.856
350
400
790
890
1290
1440
288
290
Lubricated
270
300
590
670
970
1080
-
-
1-1/4"
Dry
7/12
0.989
1.073
500
550
1120
1240
1820
2010
289
291
Lubricated
380
420
840
930
1360
1510
-
-
1-1/2"
Dry
6/12
1.405
1.581
870
960
1950
2200
3160
3560
-
-
Lubricated
650
730
1460
1640
2370
2670
-
-
a
Torque value for bolts and cap screws are identified by their head markings. Established at 75% of yield
strength of bolt given the cross-sectional area.
Note
Torque figures in table are valid for non-greased or non-oiled threads and head unless otherwise
specified. Therefore, do not grease or oil bolts or cap screws unless otherwise specified in this manual.
When using locking elements, increase torque values by 5%.
SWING AWAY CONVEYOR – PORTABLE GRAIN BELT CONVEYOR