TM 55-2210-223-34
TO 54A2-2-14-22
APPENDIX D
TORQUE LIMITS
D-1. GENERAL
This section provides general torque limits for screws used on the locomotive. Special torque limits are indicated in the
maintenance procedures for applicable components. The general torque limits given in this appendix shall be used when
specific torque limits are not indicated in the maintenance procedure. These general torque limits cannot be applied to
screws that secure rubber components. The rubber components will be damaged before the correct torque limit is
reached. If a special torque limit is not given in the maintenance instructions, tighten screw or nut until it touches the
metal bracket then tighten it one more turn.
D-2. TORQUE LIMITS
Table D-1 lists dry torque limits. Dry torque limits are used on screws that do not have lubricants applied to the threads.
Table D-2 lists wet torque limits. Wet torque limits are used on screws that have high-pressure lubricants applied to the
threads.
D-3. HOW TO USE TORQUE TABLE
a.
Measure the diameter of the screw you are installing.
b.
Count the number of threads per inch.
c.
Under the heading SIZE, look down the left-hand column until you find the diameter of the screw you are
installing (there will usually be two lines beginning with the same size).
d.
In the second column under SIZE, find the number of threads per inch that matches the number of threads you
counted in step (2).
e.
To find the grade screw you are installing, match the markings on the head to the correct picture of CAPSCREW
HEAD MARKINGS on the torque table.
f.
Look down the column under the picture you found in step (5) until you find the torque limit (in lb-ft or N.m) for
the diameter and threads per inch of the screw you are installing.
D-1
