1 | Milling pockets & head geometry
Milling pockets underneath the screw-head for an optimal countersinking:
- gentle on material
- ideal also for metal fittings
Alternative Head Typ: Washer Head
2 | Friction part
3 | Thread
Double thread with integrated notch, recessed second thread turn rolled out to the tip:
- Minimised blast effect
- Improved pull-out values
- Quicker screwin
4 | Tip
With 30° geometry
- Reduced split effect
- Quicker bite
- No pre-drilling required
Rapid® 2000 are available in 3 x16 to 6 x 300 mm.
Countersunk heads are counter-sinkable in wood or even in prepared steel plates. The milling pockets reduce the fraying and splintering of the wood.
The friction part reduces screwing resistance by opening the hole slightly wider than the screw shank. It is usually combined with the half thread.
Friction Part Geometries
The double thread is allowing for faster install times by ensuring stronger thread pull out capacities.
The Hi-Lo thread allows for energy-saving screwing with improved pull-out values. The Hi-Lo is combined with the double thread that ensures quicker installation times.
Partially threaded screws, also known as half thread, pull timber members or steel plates and timber together. For the design head pull-through and withdrawal of thread must be checked. Lateral loads as well as axial loads are efficient transferred.
The axial load capacity of the thread in comparison to the countersunk head is approx. 3:1. Using a washer head screw leads to a similar performance of the thread pull out and the head pull through capacity.
Applications for partially threaded screws.