Simex PL 4520, Use And Maintenance Manual

Page: 53 / 60

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