EJOT DELTA PT® S
Technology for Thermosets and Composites
Reduces radial stress due to low flank angle and cutting edge
Insert elimination possible
Allows for thinner boss designs
Offers high retention when used in thermosets
Multi-compound 30° flank angle and root for dynamic safety
Increased vibrational safety by improved pitch
Cutting edge for lower installation torque
The DELTA PT® screw is a proven fastener element for thermoplastics, which can also be used in many thermosetting plastics.
The expansion, which happens during thread forming, overextends the capability of some thermosets.
Therefore, the DELTA PT® S has been developed. Introducing a cutting edge reduces radial stress during thread cutting in the thermoset material.
The Cutting Edge
The DELTA PT® screw S is made with a DELTA PT® thread form and has an additional feature of a milled cutting edge over approximately three pitches at the lead thread end of the screw.
The DELTA PT® screw without cutting edge is suitable for assembly in many thermosets. The toughness and impact strength of the thermoset material should be established to establish if the cutting notch is required. The initial evaluation can establish if the cutting edge is necessary. Assembly tests on original components will give final performance confirmation. The geometry of the boss design should generally be shown on the right. It is essential that the filling of it is homogeny, especially in conjunction with long fiber materials. Extra fins on the boss can be of benefit.
d1= Nominal-Ø of the screw
dc = d1 + 0,2 mm
The possible dimension of the DELTA PT® screw with cutting-edge is limited due to manufacturing technique.
The current lengths and diameters available are listed in the matrix to the right. Parts are produced with the standard DELTA PT® styles.
Special geometries upon request.
Full thread only to 50mm length possible.