Ammann ARR 1575 - Checking the Tightness of Screw Connections

338 ARR1575
19 Appendices
19.7 Checking the tightness of screw connections
• Check regularly the screw connections for loosening.
• Use torque spanners for tightening.
Tightening torque Tightening torque
For screws 8.8 (8G) For screws 10.9 (10K) For screws 8.8 (8G) For screws 10.9 (10K)
Thread Nm lbft Nm lbft Thread Nm lbft Nm lbft
M6 10 7.4 14 10.3 M18×1.5 220 162.2 312 230.1
M8 24 25.0 34 25.0 M20 390 287.6 550 405.6
M8×1 19 14.0 27 19.9 M20×1.5 312 230.1 440 324.5
M10 48 35.4 67 49.4 M22 530 390.9 745 549.4
M10×1.25 38 28.0 54 39.8 M22×1.5 425 313.4 590 435.1
M12 83 61.2 117 86.2 M24 675 497.8 950 700.6
M12×1.25 66 48.7 94 69.3 M24×2 540 398.2 760 560.5
M14 132 97.3 185 136.4 M27 995 733.8 1400 1032.5
M14×1.5 106 78.2 148 109.1 M27×2 795 586.3 1120 826.0
M16 200 147.5 285 210.2 M30 1350 995.7 1900 1401.3
M16×1.5 160 118.0 228 168.1 M30×2 1080 796.5 1520 1121.0
M18 275 202.8 390 287.6
Values given in the table are tightening torques for dry threads (friction coecient = 0.14). The values are not applicable to lubricated
threads.
Tightening torques of compression nuts with an O ring – hoses
Tightening torques of compression nuts with an O ring – hoses
Nm lbft
Spanner
size
Thread Pipe Nominal Min Max Nominal Min Max
14 12×1.5 6 20 15 25 15 11 18
17 14×1.5 8 38 30 45 28 22 33
19 16×1.5
8
45 38 52 33 28 38
10
22 18×1.5
10
51 43 58 38 32 43
12
24 20×1.5 12 58 50 65 43 37 48
27 22×1.5
14
74 60 88 55 44 65
15
30 24×1.5 16 74 60 88 55 44 65
32 26×1.5 18 105 85 125 77 63 92
36 30×2
20
135 115 155 100 85 114
22
41
36×2
25
166 140 192 122 103 142
46 28
50 42×2 30 240 210 270 177 155 199
50
45×2 35 290 255 325 214 188 240
52×2
38
330 280 380 243 207
280
42