TM 1-1500-204-23-6
Figure 2-62. Dill Lok-Skru Fastener
d. Snap and Curtain. Snap and curtain fasteners, MS27977 MS27986 are identified by part number.
e. Interlocking Slide. Interlocking slide fasteners, commonly called zippers, are identified in table 2-12.
2-10. Studs. The type studs used in aircraft structure are coarse thread studs, fine thread studs, stepped studs, necked
stepped studs, wrench pad necked stepped studs, lockring studs, and self-tapping lockring studs. Studs are available
either drilled or undrilled on the nut end. Figure 2-63 shows some stud types.
a. Removal of Bent, Damaged, or Broken Studs.. Remove bent or damaged studs as follows.
(1)
Place adapter, as shown in figure 2-64, in stud remover.
(2)
Drive adapter down over threads of stud.
(3)
Remove studs by turning stud remover with a wrench. If threads in parent material pick up and
stud remover cannot be turned, remove stud remover from adapter.
(4)
Place stud remover block and puller on adapter and remove adapter from stud
(5)
Cut off stud close to parent material.
Table 2-12. Interlocking Slide Fasteners (Zipper)
Size
Type
Grade
Description
0
Light service
1
Light-medium service
2
Medium service
3
Medium-heavy service
A
Nonseparating, single action
B
Separating, single action
C
Nonseparating, single action with bridge stop
D
Separating, single action, quick detaching
E
Nonseparating,
double
action,
center
opening
F
Nonseparating, double action with bridge
stop
G
Separating, double action, end opening
S
Standard nonlocking
L
Locking
I
Brass
II
Zinc alloy
4
Heavy service
2-53
