DE-STA-CO INDEX DRIVES GENERAL SERVICE MANUAL User Manual
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18
Recommended Tightening Torque Values for Cap Screws
SAE Grade 2
Torque Spec.
(ft/lbs)
SAE Grade 5
Torque Spec
(ft/lbs)
SAE Grade 8
Torque Spec
(ft/lbs)
Thread Size
into Aluminum
into Steel
into Aluminum
into Steel
into Aluminum
into Steel
.250-20
3.7
5.5
5.3
8
8
12
.250-28
4.1
6.2
6.7
10
9.3
14
.312-18
7.3
11
11
17
16
24
.375-16
13
20
20
30
30
45
.375-24
15
23
23
35
33
50
.437-14
21
32
33
50
46
70
.437-20
24
36
36
55
53
80
.500-13
33
50
50
75
73
110
.500-20
36
55
56
85
80
120
.562-12
46
70
73
110
100
150
.562-18
53
80
80
120
113
170
.625-11
66
100
100
150
140
210
.625-18
73
110
113
170
160
240
.750-10
116
175
173
260
253
380
.750-16
133
200
200
300
280
420
.875-9
113
170
286
430
400
600
.875-14
119
180
313
470
446
670
1.00-8
166
250
426
640
606
910
1.00-14
186
280
480
720
680
1020
1.12-7
233
350
526
790
860
1290
1.12-12
266
400
593
890
960
1440
1.25-7
333
500
746
1120
1213
1820
1.25-12
366
550
826
1240
1340
2010
1.50-6
580
870
1300
1950
2106
3160
1.50-12
563
980
1466
2200
2373
3560
Spiralock Thread
.250-20SL*
4.3
6.3
6.1
9
11.5
14
* Used on 601RDM Housing and input cartridge
NAAMS STD F-2.3
NAAMS STD F-2.3
Into Steel
Into Aluminum
Into Steel
Into Aluminum
Thread Size
10.9/12.9
Nm
Ft-lb
Nm
Ft-lb
Thread Size
8.8
Nm
Ft-lb
Nm
Ft-lb
M6x1.0
16
12
11
8
M6x1.0
10.5
7.7
7
5
M8x1.25
39
29
26
19
M8x1.25
26
19
17
13
M10x1.5
77
57
50
37
M10x1.5
51
37
34
25
M12x1.75
135
100
89
66
M12x1.75
89
65
59
43
M16x2.0
335
247
220
163
M16x2.0
215
158
143
105
M20x2.5
650
480
430
315
M20x2.5
420
309
280
205
M24x3.0
1130
834
745
550
M24x3.0
725
534
483
355
M30x3.5
2240
1653
1478
1090
M30x3.5
1450
1069
965
712
Note: Torque values are for non-lubricated cap screws, coated only with a residual film of oil, as
received from the manufacture and a thread locking solution applied to the threads. IMC
recommends "Loctite Removable Threadlocker 242" be applied to all fasteners and tapped holes at
assembly