EJOT DELTA PT® DS
New Technology for Thermosets and Composites
Reduced boss diameter and height requirements
High resistance to pull-out forces
Provides repeat assembly and "insert removal"
Minimized clamp load loss
Improved vibration resistance
Multi-Compound angled thread
Forming flutes along body of screw
Profiled thread root for material containment
Some designs require thermosets, which pose special demands on the direct assembly because of their hardness and brittleness.
In response to these challenging conditions, the DELTA PT® DS screw was developed. Special grooves that help to cut the female thread have been added to the thread geometry of the established DELTA PT®. These grooves are especially distinct at the tip of the thread and taper off towards the screw head. This thread-forming zone enables a low tightening torque while maintaining a high stripping torque.
Smaller hole depth is possible because less chip space is required compared to screws with a traditional cutting edge.
Cost-saving potential through standardization – only one screw for thermosets and thermoplastics.
Removal of costly inserts is possible due to the multiple reusability feature provided by the thread design.
More comprehensive production range regarding screw diameter and length.
Larger thread engagement area for the same insertion depth.
dh = Hole- Ø = 0.83 - 0.90 x d1
d1 = Nominal Ø of the screw
dc = Counterbore diameter = d1 + 0.2 mm
tc = Chip space = 0.8 - 1.2 x d1