MNL-126509
April 4, 2013 Page 123
8.5 Reference Data
8.5.1 Tightening Torque Values
1. Unless otherwise specified in text, the torque values in Table 1 apply.
2. The indicated torque values are valid for bolts in greased condition.
3. Self locking nuts must be replaced on reassembly
4. Pipe connections (swivel nuts) should be tightened just enough so that leakage is stopped. Not more
than finger tight plus up to an additional half turn.
8.5.2 Torque Sequence Diagrams
8.5.3 Conversion Formulas
°F = 9/5 °C + 32 °C = 5/9 x (°F - 32)
psi = bar x 14.5 bar =psi x 0.0689
Table 8-1: Torque Values
Bolt or Screw Size Max. Torque
Hex and Socket Head 1/4 in (6 mm) 7 ft-lb. (9.5 N m)
Hex and Socket Head 5/16 in (8 mm) 18 ft-lb. (24.4 N m)
Hex and Socket Head 3/8 in (10 mm) 32 ft-lb. (43.4 N m)
Hex and Socket Head 1/2 in. (12 mm) 53 ft-lb. (71.9 N m)
Hex and Socket Head 9/16 in (14 mm) 85 ft-lb. (115.3 N m)
Hex and Socket Head 5/8 in (16 mm) 141 ft-lb. (191.2 N m)
Figure 8-5 6 Bolt and 4 Bolt Torque Sequence
12
3
4
4 Bolt Torquing
Sequence
1
2
3
4
5
6
6 Bolt Torquing
Sequence
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