Simex PL 4520 - Charts; Maximum Screw Tightening Torques; Tightening Torques for Hose Fittings; Tightening Torques for Hoses

53
17 Charts
17.1 Maximum screw tightening torques
SCREW
CLASS
SCREW DIAMETER - TORQUE (Nm) – 0.10 FRICTION COEFFICIENT
ISO DIN M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30
8.8 8G 2.4 4.9 8 20 40 69 110 170 235 330 446 570 840 1150
10.9 10K 3.3 7 12 28 56 98 155 240 330 465 620 800 1200 1600
12.9 12K 4 8 14 34 67 116 185 285 395 560 750 960 1400 1950
Fitting advice
- The screws must be lubricated with engine oil;
- For parts fastened with two or more screws, the screws must be tightened progressively and
alternately until the prescribed torque is reached;
- If flat washers are needed, steel washers with a minimum resistance of 80 Kg/mm2 must be used.
17.2 Tightening torques for hose fittings
17.3 Tightening torques for hoses
FITTINGS
‘’GAS’’
DIAMETER TORQUE (Nm)
1/4’’
35
3/8’’
70
1/2’’
100
3/4’’
190
1’’
300
1’’1/4
330
1’’1/2
400
FITTINGS
“W’’ (inch)
DIAMETER
TORQUE
(Nm)
9/16’’
30
3/4”
50
7/8’’
70
1’’ 1/16
100
1’’ 3/16
130
1’’ 5/16
145
1’’ 5/8
190
1’’ 7/8
240
WITH ORFS FITTINGS
“W’’ (inch)
DIAMETER
TORQUE
(Nm)
9/16’’
25
11/16’’
40
13/16’’
55
1’’
86
1’’ 3/16
125
1’’ 7/16
165
1’’ 11/16
200
2’’
245
WITH JIC 37° FITTINGS
“W’’ (inch)
DIAMETER
TORQUE (Nm)
9/16’’
30
3/4”
50
7/8’’
70
1’’ 1/16
100
1’’ 3/16
130
1’’ 5/16
145
1’’ 5/8
190
1’’ 7/8
240
WITH GAS FITTINGS
‘’GAS’’
DIAMETER
TORQUE
(Nm)
1/4’’
15
3/8’’
28
1/2’’
60
5/8’’
70
3/4’’
110
1’’
140
1’’1/4
190
1’’1/2
245