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Click
here to download Fixing to Metal PDF
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About Fasteners Now
These Metal Teks®
self-drilling screws have a hardened drill point
that will drill and thread in structural steel and
mild steel.
There are
two main criteria of a Teks point.
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- The point must be in perfect
diameter ratio relationship to the thread, so
as to not overdrill. This allows the thread
to engage in the steel at an acceptable tapping
torque. The pullout load is also determined
by the ratio of the thread diameter to the hole
diameter.
- The point must have a swarf flute
longer than the total thickness of the steel
being drilled. This prevents problems with fastener
installation due to swarf clogging the flue.
It is important that the drill point has completed
drilling the total thickness of the steel before
the thread engages.
To choose the correct fastener, it is necessary
to select one where the length of the drill
point is equal to or greater than the total
thickness of the material to be drilled including
the air-gap. If the drill point is less than
the total thickness of the material and the
thread engages, then the fastener can break
or become impossible to drive.
As a rule the correct length screw should have
at least 3 threads protruding behind the metal
you are fastening to.
The table indicates the metal thickness capacity
of each gauge size available. When the gauge
size has been determined, the length and head
style for the intended application would then
need to be determined.
| Screw Gauge |
Threads per inch |
Drilling Capacity (max) |
| 6 |
20 |
2.3mm |
| 8 |
18 |
2.5mm |
| 10 |
16 |
3.5mm |
| 10 |
24 |
4.5mm |
| 12 |
14 |
4.5mm |
| 12 |
24 |
6.0mm |
| 13 |
13 |
1.0mm |
| 14 |
10 |
3.0mm |
| 14 |
20 |
6.4mm |
| 15 |
15 |
1.0mm |
| Series 500-12g |
24 |
12.5mm |
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Buildex Metal Teks® are available
in a variety of finishes with unique product features
to suit a wide range of environmental conditions.
How To Use
- Measure the total thickness of the materials
to be drilled.
- Choose a screw that has a drilling capacity
equal to or greater than the total thickness
of materials to be drilled.
| Screw Gauge-TPI |
Drilling Capacity |
| 6-20 |
2.3mm |
| 8-18 |
2.5mm |
| 10-16 |
3.5mm |
| 10-24 |
4.5mm |
| 12-14 |
4.5mm |
| 12-24 |
6.0mm |
| 13-13 |
1.0mm |
| 14-10 |
3.0mm |
| 14-20 |
6.4mm |
| 15-15 |
1.0mm |
- Determine the best head style for the intended
application.
- Choose a screw long enough to allow at least
three threads to protrude beyond the metal being
fastened to.
NOTE: The lengths shown for countersunk, countersunk
rib and bugle head screws indicate the distance
from the top of the screw head to the screw
point. For all other screw types, the length
is measured from the underside of the screw
head to the screw point.
- Select the correct driver for the screw being
used.
| Head Style |
Driver |
| Wafer Hd 8/10g |
#2 Phillips bit |
| Wafer Hd 12g |
#3 Phillips bit |
| Pan Hd |
#2 Phillips bit |
| CSK 6/8/10g |
#2 Phillips bit |
| CSK 14g |
#3 Phillips bit |
| CSK Rib 6/8/10g |
#2 Phillips bit |
| CSK Rib 14g |
#2 Phillips bit |
| Tamper Resistant Hd |
* Special Driver |
| Hex Hd 8g |
1/4" Hex Socket |
| Hex Hd 10/12/13g |
5/16" Hex Socket |
| Hex Hd 14/15g |
3/8" Hex Socket |
| Button Head |
#2 Phillips Bit |
| Bugle Head |
#2 Phillips bit |
| Self-Embedding Head |
#2 Phillips bit |
* Available from the Buildex Customer Service
Centre
- Fit driver to a power
screwdriver (Tek Gun) set to HIGH (approx. 2500rpm).
- Put screw onto driver and place
at fastening position.
- Push sharply on screwdriver to
create a starting point.
- Squeeze screwdriver trigger and
maintain firm end pressure until screw has drilled
and fastened.
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