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Page Title:
Table 7-3. Bill of Materials for Blocking and Tiedown of Semitrailer, M747, on CONUS General-Purpose Flatcar (Figs 7-2 and 7-... |
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 TM 55-2320-258-14
Table 7-3. Bill of Materials for Blocking and Tiedown of Semitrailer, M747, on CONUS General-Purpose Flatcar (Figs 7-2 and 7-3)
Approximate
Quantity
Description
Item
Douglas-fir, or comparable; Straight-grain, free from material defects; Fed Spec
Lumber
12 linear feet
MM-L-751H: 6- x 8-inch
16 linear feet
2- x 6-inch
52 linear feet
2- x 4-inch
40
Common, steel; flathead; bright; table XI-b, Fed Spec FF-N-105B: 40d
Nails
44
12d
168
20d
8
Standard, Open-type: 1/2-inch
Thimbles
Wire rope, U-bolt clips, saddled, single-grip, steel, Crosby heavy-duty, or equal;
Clamps
24
Fed Spec FF-C-450D: 1/2-in.
6X19, IWRC; improved plow steel; preformed, regular-lay; table X, Fed Spec
Wire rope
RR-W-410C: 1/2 - in.
100 ft
as required
Waterproof paper, burlap, or other suitable material.
Cushioning
material
Strapping, steel: type 1, class A, B, orC; Fed Spec QQ S-781 11/4-X0.050-in.
100 ft
Steel strap
20
Strap seal, commercial grade, 11/4-in.
Seal
25
Strap edge protector, commercial grade, 11/4-in.
Edge protector
25
Strap staple, commercial grade, 11/4-in.
Staple
Table 7-4. Application of Materials for Blocking and Tiedown of Semitrailer, M747, on CONUS General-Purpose Flatcar (Figs 7-2 and 7-3)
Application
No. Required
Item
Brake wheel clearance. Minimum clearance required is 6 in. above, in back of, and
A
on both sides of and 4 in. underneath wheel (fig 7-2).
Blocks (detail 1, fig 7-3). Each to consist of one piece of 6- x 8- x 24-in. lumber
B
8
cut as shown in detail 1. Locate two blocks in front of each front inboard wheel
and behind each rear inboard wheel with the 45-degree side against the tire. Nail
heel of block to car floor with three 40d nails. Toenail sides of block to car floor
with two 40d nails on each side.
C
4
Blocks. Each to consist of one piece of 2- x 4- x 10-in. lumber. Locate one piece
against tires and on top of each pair of item B. Nail to item B with two 12d nails
at each end.
Cushioning material. Locate bottom portion under item E and between tire and
1 ea item E
D
item E so as to extend 2 in. above item E (detail 2, fig 7-3).
2
Side block. Each to consist of one piece of 2- x 6- x 96-in. lumber and three
E
pieces of 2- x 4- x 96-in. lumber (detail 2, fig 7-3). Nail 2- x 6- x 96-in. piece
to edge of bottom 2- x 4- x 96-in. piece with twelve 12d nails. Then place
against inside of tires and cushioning material, and nail to car floor through 2- x
4- x 96-in. piece with twelve 20d nails. Nail other two 2- x 4- x 96-in. pieces to
one below in the same manner.
Wire rope. Each to consist of one piece of 1/2-in. width rope, length as required
4
F
(approximately 15 ft). Form a single loop between tiedown shackle and
appropriate stake pocket at a maximum angle of 45 degrees (detail 3, fig 7-3).
Wire rope ends should overlap approximately 24 in.
G
Thimbles. Place one under wire rope at each place where rope passes over bottom
8
edge of stake pocket and tiedown shackle. Secure each thimble to wire rope with
one clamp (detail 3, fig 7-3).
Change 1
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