TM 1-1500-204-23-6
Figure 2-38. Machine Screws
Figure 2-40. Self Tapping Screws
(3)
Drive screws. Drive screws, MS21318, as shown in figure 2-40, are plain head, self-tapping screws used
as capscrews in the attachment of nameplates in castings or in sealing drain holes in corrosion-proofing tubular
structures. These screws differ from other self-tapping screws in that they are not formed to fit screwdrivers and are not
intended to be removed after installation. Drive screws are installed by driving the screw into a drilled hole with a
hammer.
f.
Electrical Screws. Use round-head machine screws, AN508, as shown in figure 2-41, for electrical use in
such application as instrument installations where nonmagnetic qualities are desired.
2-6.
Clamps. Clamp identification and types used in Army aircraft maintenance are presented in the
following paragraphs.
a.
Clamp Identification. Clamps are identified as one of the following types.
(1)
Loop-type bonding clamp.
A plain metal uncushioned clamp, as shown in figure 2-42, which bonds
metal tube to the airframe.
Figure 2-39. Fillister Head Screw
2-40
