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Product Technical Data Sheets
Technical Specifications
Screw Selection Chart
Buildex® self-drilling screws are designed with features to suit a wide number of applications and materials and it is important that they are used correctly. In many cases, installation problems have been found to be due to simple faults in product use or operator technique.
The following chart should assist users to obtain maximum efficiency from Buildex® screws. Always use a TEK gun with a clutch, minimum 600W/1500rpm.


Buildex Technical Help Desk Phone: 1300 137 273
  Fax: 1800 137 272
  Email: technicalhelpdesk@buildex.com.au

  Problems Problem Causes Solutions
  Drill Points are difficult to
start and keep sliding on
metal surface.
The screw is not being held at right angles
to the work surface.
Hold the screw at 90 degrees to the work
being drilled.
Insufficient force being applied when
starting drilling action.
For most efficient operation approx 10kg of
force should be applied.
Steel being drilled is too hard. Simultaneously squeezing the trigger of the
driver apply extra force to the drill point to
assist it to “dig in” as it starts to rotate.
Screwdriver running in reverse. Change switch to forward position.
  Screws wobble and are
difficult to start.
Drive bit broken, worn, clogged. Clean driver bit or replace with new driver bit. Screw must fit firmly on the drive bit.
  Screws drill but will not thread. Thickness of material being drilled is too thick. Check overall thickness of materials.
Insufficient power in screwdriver, drops in power and speed. Reduce lead length. Use heavy duty
screwdriver 380 Watt minimum.
  Heads “break off”
when tightened.
Screwdriver depth locater not set correctly.

Adjust depth locater further forward so that
drive will disengage at correct depth.

Torque clutch set too high. Back off driver ratchet to reduce torque.
  Drill points commence to
drill but have difficulty in
completion of drilling.
• Steel being drilled is too hard in sections.

Test screws into another piece of steel.

Materials too thick for gauge of screw.
(point length)
Select right gauge screw with correct
drilling capacity.
  Screw threads stripping
in steel.
Steel being drilled is too thin. Use a coarser thread product.
  Drill points breaking. After drilling through one thickness of
materials, drillpoint may be crashing forward
onto the second thickness when there is an
air-gap in between.
A longer or extended drill point is recommended where the application involves drilling through one material, then passing through air, to drill through and fasten into a second steel member.
Driver is set in reverse mode. Change switch to forward position.
Too heavy on end load. Let the screw do the work.
  Sealing washers squashing
out under head.
Depth locater incorrectly set.

Adjust the depth locater forward.

Excessive force driving fastener. Use less force setting fastener.
  Cross recess driver bits
breaking or wearing out
prematurely.
Torque or depth on screwdriver
incorrectly set.
Re-set to avoid over tightening of the screw, maintain firm pressure setting the screw.
Incorrect cross recess being used. Replace with correct type of driver bit.
(Phillips)
Incorrect tool being used. Use a TEK gun.
  Wing Teks® threading in
wood - wood lifting up.
Wings breaking off too early.

Reduce pressure to allow wings to
counter bore hole.

Fastening into wood knot.
Move fastener to another position.
  Heads of self embedding
Teks® not embedding
below surface.
Incorrect fastener being used. Drill point
must drill fibre cement sheet and before
thread engages, otherwise thread connects
in fibre cement and counters embedding teeth.
Choose correct fastener.
Compressed fibre cement sheet too hard.
Pre countersink sheets prior to screw fitting.
Cross recess damaged. Ensure drive bit is “Phillips” not “Pozidrive”.
Depth gauge is set incorrectly. Set Depth gauge to stop when fastener is approximately 1mm below the surface.


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