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594 03-9529998 : ראשל”צ טל 1 אדר יבוא ושיווק פרזול בע”מ רחוב דוד רזיאל 03-9511511 :פקס
WPW tips will help you to understand
this issue and avoid problems
such as wood cracking
Skipping the predrilling process
Drillinga clearanceholeandcountersink
WPW Countersink & Stop for a long lasting perfect joint.
NOT SUCH A SIMPLE JOB.
When joining 2 pieces of wood using screws, it is essential to predrill and
countersink in order to achieve an esthetic and long lasting finish.
• Pilot hole - in the bottom board.
• Clearance hole and Countersink - in the top board.
The pilot hole diameter should roughly match the root diameter of the screw.
It can be slightly smaller for softwood.
The clearance hole should be slightly larger than the diameter of the threads.
For decking jobs, it is not usually necessary to pre-drill the bottom board,
as it will always be hidden from view.
This might cause splitting and cracking of the wood or even breakage of the
screw when using hardwood or composite materials.
This failure can appear immediately after driving the screw, or after a certain
period, due to not enough room for the wood to expand and contract as
moisture levels in the wood change due to it being exposed to the weather.
Avoid cracking - always predrill before driving a screw!
Clearance hole ensures a tight joint, allowing the screw to pass freely through
the top board. The screw engages only the bottom board. Hence, the upper
board is pulled down to the bottom board.
Countersink is needed to set screws flush or below the surface of the board!
Depth-Stop helps to always achieve the same depth of the countersink.
1 2 3
No problem! Use WPW
Countersink & Stop.
WPW!
We need your help!
Thread
Diameter
Countersink
Root
Diameter
Clearance hole,
Sized to thread
Diameter
Pilot hole
Sized to
Root
Diameter