TM 55-7440-240-14
Table 6-3 Bill of
Materials for Blocking
and Tiedown of
Power Unit, PU-732/M, in General
-Cargo Vessel
Approximate
quantity
Description
Item
Douglas-fir, or comparable, straight-grain, free from material defects; Fed Spec MM-L-
Lumber
751H:
4 linear ft
2- x 4-inch
12 linear ft
2- x 12-inch
52 linear ft
4- x 6-inch
16
Nails
Common, steel, flathead, bright or cement-coated; Fed Spec FF-N-105B: 12d
12
60d
50 ft
3/8-inch
6 x 19 IWRC, improved plow steel, preformed, regular-lay; Fed Spec RRW410C:
Wire rope
Wire rope, U-bolt clips, saddled, single grip, steel, Crosby heavy-duty or equal; Fed Spec
Clamps
16
FF-C-450D: 3/8-inch
Application of Materials for Blocking and Tiedown of Power Unit, PU732/M, in General-Cargo Vessel
Item
No. required
Application
4
Lumber, 2- x 12- x 36-inch. Pre-position on vessel deck so that two pieces are under each pair
A
of wheels and parallel to the long axis of the trailer.
B
2
Side blocks. Each to consist of 4- x 6- x 156-inch lumber. Locate one piece centered on the
trailer and against each outside wheel.
3
c
End blocks. Each to consist of 4- x 6- x 104-inch lumber. Locate one piece forward of and to
the rear of trailer wheels across items B. Locate one piece across items B and under lunette.
Toenail each end of each block to items B with two 60d nails.
4
Backup cleats. Each to consist of 2- x 4- x 12-inch lumber. Locate one piece on top of items B
D
against the joint of the items C which are against the wheels. Nail to items B with four 12d
4
Wire rope, approximately 12 feet each. Form a complete loop through a trailer tiedown provi-
E
sion and appropriate deck padeye or D-ring. Pull wire rope taut and secure with clamps (item
F).
F
16
Clamps. Use four to secure each item E. Details for placement of clamps may be found in