TM 55-7440-240-14
Table 5-1. Bill of Materials
for Blocking and Tiedown of
Truck, Cargo, M813AI, on
Highway Carrier
Approximate
Description
quantity
Item
Douglas-fir, or comparable, straightgrain, free from material defects; Fed Spec MM-L-
Lumber
751H:
6- x 8-inch
12 linear ft
2- x 6-inch
12 linear ft
2- x 4-inch
24 linear ft
Common, steel, flathead, bright or cement-coated; Fed Spec FF-N-105B:
Nails
20d
48
30d
52
40d
16
60 ft
6 x 19 IWRC, improved plow steel, preformed, regular lay; Fed Spec RR-W-410C: -inch
Wire rope
Wire rope, U-bolt clips, saddled, single grip, steel, Crosby heavy-duty or equal; Fed Spec
Clamps
FF-C-450D: -inch
24
Thimbles
Standard, open-type: -inch
8
Waterproof paper, burlap, or other suitable material
as required
material
Table 5-2. Application of Materials
for Blocking and Tiedown of
Truck, Cargo,
M813A1, on
Highway Carrier
Application
Item
No. required
8
Chock block (detail 1, fig 5-3). Place 45" end against front of front and outside intermediate
A
wheels and against rear of front and outside rear wheels, as shown in figures 51 and 52.
Toenail heel of block (33 end near bottom edge) to trailer floor with one 20d nail in each
block. Drive two 40d nails into heel of each block, perpendicular to floor. Toenail each side of
each block to floor with two 30d nails.
Cushioning material (detail 2, fig 5-3). Locate bottom portion under item C and between tire
as required
B
and item C so as to be 2 inches above item C.
Side block (detail 2, fig 5-3). Each to consist of one piece of 2- x 6- x 36-inch lumber and two
4
C
pieces of 2- x 4- x 36-inch lumber. Nail 2- x 6- x 36-inch piece to edge of lower 2- x 4- x
36-inch piece with five 20d nails. Place 2- x 6- x 36-inch piece against cushioning material
and tire, and nail to floor through 2- x 4- x 36-inch piece with five 20d nails in a staggered
pattern. Nail upper 2- x 4- x 36-inch piece to lower piece with five 30d nails.
4
D
Tiedowns (detail 3, fig 5-3). Each to consist of one piece -inch 6 x 19 IWRC wire rope, length
as required (approximately 15 feet). Form a complete loop between tiedown provision and
appropriate trailer stake pocket at a maximum angle of 45 degrees. Wire rope ends should
overlap approximately 24 inches.
Clamps (detail 3, fig 5-3). Place four on each item D at overlap area. Space clamps 3-inches
24
E
apart with a minimum of 6 inches from ends of wire rope. Place one clamp on each thimble,
item F, to secure thimble to wire rope at trailer stake pockets and vehicle tiedown provi-
sions.
Thimbles (detail 3, fig. 5-3). Locate one under wire rope at each place where wire rope passes
8
F
through vehicle tiedown provision and over edge of trailer stake pocket. Secure each thimble
to wire rope with one -inch clamp.