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Page Title: Table 5-1. Bill of Materials for Blocking and Tiedown of the M973 on the M127A1 Semitrailers (Figs 5-1, 5-2, and 5-3).
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TM 55-2350-272-14
Table 5-1. Bill of Materials for Blocking and Tiedown of the M973 on the M127A1 Semitrailers (Figs 5-1, 5-2, and 5-3).
Item
Description
Approximate
Quantity
Lumber
Douglas-fir or comparable, straight-grain free from material defects;
Fed Spec MM-L-751:
2 linear ft
2- x 4-inch
100 linear ft
2- x 6-inch
40 linear ft
2- x 10-inch
Nails
Common, steel; flathead, bright or cement-coated, type II, style 10;
Fed Spec FF-N-105:12d
270
20d
100
Wire rope*
6 x 19 IWRC; improved plow steel; preformed, regular-lay; table X,
Fed Spec RR-W-410:
1/2-inch
130 ft
Clamps*
Wire rope, U-bolt clips, saddled, single-grip, forged steel, Crosby
heavy-duty or equal; Fed Spec FF-C-450: inch
20
5/8-inch
6
Thimbles*
Standard, open-type, -inch
6
*Chains and loadbinders may be substituted.
Table 5-2. Application of Material for Blocking and Tiedown. of the M973 on the M127A1 Semitrailer
Item No. Required
Application
A
2
H-frame bracing (detail 1, fig 5-3). Each layer consists of three pieces of 2- x 6- x 11-inch lumber
and two pieces of 2- x 6- x 96-inch lumber. Place the first piece of 11-inch lumber 70 inches from
the forward end of the trailer with one end 5.5 inches from the centerline of the trailer. Nail to the
trailer with four 12d nails. Place the second piece (centered) 4 feet from the forward side of the
first piece. Place the third piece so that the aft edge is 8 feet from the forward edge of the first
piece. Nail each with four 12d nails. Place one piece of 96-inch lumber against the ends of the
11- inch pieces and nail each with sixteen 12d nails. Repeat for the second layer, except nail with
20d nails. Build the second H-frame so that the forward end is 38 inches from the aft end of the
forward H-frame.
Load the M973.
B
4
Forward track chocks (detail 4, fig 5-3). Each consists of five pieces of 2- x 10.inch lumber nailed
together with 12d nails. Place one chock firmly against each track at the forward end of each unit.
Toenail with three 20d nails in each side.
C
4
Rear track chocks (detail 5, fig 5-3). Each consists of five pieces of 2- x 10-inch lumber nailed to-
gether with 12d nails. Place one chock firmly against each track at the rear end of each unit.
Toenail with three 20d nails in each side.
D
8
Backup cleats. Use two pieces of 2- x 6- x 12-inch lumber. Place against the heel of each track
chock, items B and C. Nail the bottom piece with four 12d nails and the top piece with four 20d
nails.
E*
8
Wire rope (detail 3, fig 6-3). Each consists of 1/2-inch wire rope, length as required. Form a com-
plete loop between the front units' forward tiedown fixtures and the right stake pocket. Form a
complete loop between the front units' forward tiedown fixtures and the left stake pocket. Place
one complete loop from the left stake pocket over the lower support arms, between the units, to the
right stake pocket. Secure a 2- x 4- x 10-inch wooden block between the wire rope and each sup-
port arm so that the wire rope does not contact the support arms when wire is tensioned. Form one
complete loop between the rear units pintle and the right stake pocket. Form a complete loop be-
tween the rear units' pintle and the left stake pocket, tension all tiedowns evenly.
CAUTION
Tension tiedowns evenly. Do not exceed 400 pounds of tension on any single tiedown.
(Wire rope ends should overlap a minimum of 20 inches.) Secure with four 1/2-inch clamps (item
F).
F*
32
Clamps, 1/2-inch (detail 3, fig 5-3). Place four clamps on each wire rope loop at the overlap area.
Space the four clamps 2 inches apart, with a minimum of 6 inches from the free end of the wire
rope. Tension wire rope and tighten clamps from 20- to 25-foot-pound torque.
G*
6
Thimbles, 1/2-inch (detail 2, fig 53). Place a thimble between the wire rope and the stake pocket
and secure with item H.
H*
6
Clamps, 5linch (detail 2, fig 5-3). Secure each -inch thimble with one clamp.
*Chains and loadbinders may be substituted.
5-4

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