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TM 5-4210-220-34
e.
Fasteners
Replace any bolt, screw, nut, or fitting that has damaged threads. Inspect tapped holes for damage. If fitting
cannot be retapped with next oversize screw or stud, chasing the threads with proper size tap or die may cure
the problem.
f.
Lockbolts
The lockbolt and collar type fasteners are used to secure the body panels on the truck
Always use the correct lockbolt when replacing equipment. Measure the width of all the various layers of
metal. Add these together and use the lockbolt with the correct grip range.
NSN
VENDOR
GRIP RANGE
HOLE
PART NO.
(INCHES)
SIZE
5306-01-245-0086
2801-06-03
0.1 25/0.250
.203
2590-01-244-6212
2801-06-04
0.187/0.312
.203
5306-01-244-6247
2801-06-05
0.250/0.375
.203
5306-01-245-0087
2801-06-06
0.312/0.437
.203
5306-01-244-6248
2801-06-08
0.437/0.562
.203
REMOVAL
(1)
Using a hammer and a center punch, center punch the lockbolt head.
(2)
Using a 13/64 in. drill bit and an electric drill, drill the lockbolt head until it is removed.
(3)
Using a hammer and a pin punch, tap on lockbolt shank until it falls out.
INSTALLATION
(1)
Set and clamp parts to be lockbolted in proper alinement. If holes are predrilled aline holes and clamp
parts together.
(2)
Drill 13/64 in. mounting holes as necessary.
(3)
Insert lockbolt into prepared hole. Ensure the lockbolt is installed with the head facing the outside of the
body.
(4)
Install the lockbolt collar onto the lockbolt from the opposite side of body panel.
(5)
Place nose of hand tool (Model 721) over the shank of the lockbolt and against the lockbolt collar.
(6)
Squeeze hand tool levers together. As the tool pulls on the lockbolt shank, the sheets of metal are
drawn together. The tool compresses the lockbolt collar Into the locking grooves and continues to pull
on the lockbolt shank until lockbolt collar is completely compressed. The shank will break off at the
neck. Discard the portion of the lockbolt shank that breaks away.
(7) Repeat steps 1 thru 6 until all necessary lockbolts are installed.
g.
Insert Fasteners
There are two different sizes of Insert fasteners used on this truck Use the following table to determine size and
NSN for either insert fastener.
2-18
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