TEKS® Self-Drilling
Fasteners
 ITW
Shakeproof produces both forged point and milled point
Teks self-drilling fasteners that drill their own hole
in thin sheet metal, heavier gauge metals and non-metallics.
They form close mating threads in these holes to produce
a complete fastening system in a single operation. This
total performance self-drilling fastener reduces labor,
is ideal for automated assembly, simplifies and improves
fastening designs, reduces or eliminates the need for
drill bits or taps and cuts expensive tooling costs.
GER-NIB® FEATURE:
For particularly torque-sensitive applications, Shakeproof's
torque-robbing Ger-Nib feature can be incorporated in
the Teks fastener head.
Tapping
and Fastening
Once
the hole is drilled, Teks fasteners tap the hole in the
same way as thread forming or thread cutting screws do
in a pre-drilled hole. Teks fasteners, however, provide
two outstanding installation advantages over ordinary
self-tapping screws:
- By
point design and diameter control, Teks fasteners always
drill the proper hole for optimum fastening. The possibility
of an incorrect hole diameter or an out-of-round condition
is eliminated, assuring consistent driving and fastening
torque.
- Torque
variations caused by paint build-up, weld flash or
foreign material in pre-drilled or pre-punched holes
are eliminated.
Drilling
Figure
1 shows a No. 8-18 Teks fastener drilling a hole in steel.
Maximum drilling efficiency is attained as it advances
at the rate of .004" per revolution. The screw thread
rate of advancement, however, is .055" per revolution.
It is therefore essential that the drilling function
be complete and the material be fully penetrated before
the first screw thread engages. To meet this requirement,
the unthreaded length of the Teks point must be equal
to, or greater than, the material thickness to be drilled.
It is important to understand that where more than one
sheet of material is involved, the calculation of the
total thickness of the material to be drilled must include
voids or spaces between the sheets. Figure 2 illustrates
three examples.
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