TM 5-1940-322-24
FIELD MAINTENANCE INSTRUCTIONS
BRIDGE ERECTION BOAT (BEB)
MK II-S
NSN 1940-01-526-0770
P/N 12492423
TORQUE LIMITS
INTRODUCTION, HOW TO USE TORQUE LIMITS, CAPSCREW HEAD MARKINGS, TORQUE TABLES,
TUBING APPLICATION TIGHTENING ASSEMBLY INSTRUCTIONS,
TORQUE WRENCH ADAPTERS, AND CONVERSION FORMULA
INTRODUCTION
This Work Package (WP) provides general torque limits for screws used on the MKII-S Bridge Erection Boat
(BEB). Special torque limits are indicated in the maintenance procedures for applicable components. The
general torque limits in this WP shall be used when specific torque limits are not indicated in the
maintenance procedure. These general torque limits cannot be applied to screws that retain 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 the screw or nut until it touches the metal
bracket, then tighten it one complete turn.
HOW TO USE TORQUE LIMITS
1.
Measure the diameter of the screw you are installing.
2.
Count the number of threads per inch.
3.
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).
4.
In the second column under SIZE, find the number of threads per inch that matches the number of
threads you counted in step 2. (Not required for metric screws).
CAPSCREW HEAD MARKINGS
1.
To find the grade screw you are installing, match the markings on the head to the correct picture of
Capscrew Head Markings in the illustration preceding the torque table.
2.
Look down the column under the picture you found in step 1, until you find the torque limit
(in., lb-ft or Nm) for the diameter and threads per inch of the screw.
TORQUE TABLES
Table 1 lists dry torque limits. Dry torque limits are used on screws that do not have lubricants applied to
the threads. Table 2 lists wet torque limits. Wet torque limits are used on screws that have high pressure
lubricants applied to the threads. For metric fasteners, refer to table 3 for torque limit requirements.
0179 00-1
