18
Recommended Tightening Torque Values for Cap Screws
Thread Size
SAE Grade 2
Torque Spec.
(ft/lbs)
SAE Grade 5
Torque Spec
(ft/lbs)
SAE Grade 8
Torque Spec
(ft/lbs)
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
Thread Size
10.9/12.9
NAAMS STD F-2.3
Thread Size
8.8
NAAMS STD F-2.3
Into Steel
Into Aluminum
Into Steel
Into Aluminum
Nm
Ft-lb Nm Ft-lb
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. DESTACO
recommends "Loctite Removable Threadlocker 242" be applied to all fasteners and tapped holes at
assembly