Page 184 - Rotating Machinery Pratical Solutions to Unbalance and Misalignment

Rotating Machinery: Practical Solutions

The above table is provided for reference only. Always con-
sult the manufacturer ’s recommended torque specifications if
available. When tightening fasteners, it is recommended that the
final torque value is reached in three stages—that is, first torque to
33%, then 66%, and then the final value. In addition, assure that
a proper tightening pattern is used.

1
6 4
1 3
8 7
4 2 3 2
5

Figure A-1. Some Basic Torque Sequences

Some newer machines may have metric bolts and the torque
specifications may be given in Newton-Meters. To convert New-
ton-Meters into foot-pounds of torque:

1 Meter = 3.28333 Feet
1 Newton = .225 Pounds
1 Foot x 1 Pound
———————————————
.30456 Meters x 4.4444 Newtons
Foot-Pounds = Newton-Meters/1.3536 (A-1)