441


UNI 8113 - DIN 7500M

TRILOBULAR SCREWS PHIL FLAT HEAD
The self-forming trilobe screw is a triangular section screw with metric thread suitable for direct screwing in blind or through holes. Its main feature consists in avoiding the threading phase in steel and light alloy products. During screwing, this screw forms the thread plastically, i.e. by deformation of the material, thus creating a play-free coupling between screw and nut, thus ensuring optimal fastening with high resistance to tearing and unscrewing due to the vibrations of use. The creation of the thread in this condition avoids the formation of shavings, a feature particularly required by several regulations concerning threads on blind holes. Regardless of the screw length, the efficiency of this thread is expressed in the first 20 / 25mm only starting from the tip. The presence of a longer thread length does not affect the screw's sealing capacity. The utmost attention must be paid to the holes or die-casting pins that will be used for the creation of the holes: an incorrect hole even if only five cents can in some cases radically change the tightness of the screw. It should also be said that not all the tables in circulation are correct for the use of the screws in question; this situation was created following the regulatory grouping of various types of self-forming screws, which however had different characteristics and therefore different holes for use. From our long and affirmed technical experience we can maintain that the hole suitable for any type of use is four or five tenths maximum smaller than the nominal diameter of the screw; in case of die-casting, a maximum taper of one degree must be calculated. Different tapers can create problems during particularly heavy tightening, as they interfere with the regulation of the screw: it can in fact have a forming part of four times its own pitch. Our trefoil screws, in addition to the galvanic treatment according to RoHs regulation, are subjected to a lubrication treatment, necessary to reduce the screwing effort by 30%.

The length of the screw is calculated by measuring the screw including the head.

Code Description Availability Certifications Request offer
441.02506ZN VITI TRILOBATE 2.5X 6 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.02506ZO VITI TRILOBATE 2.5X 6 TS+ UNI 8113 Z.NERO Cr.3 0.0
441.02508ZN VITI TRILOBATE 2.5X 8 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.02510ZN VITI TRILOBATE 2.5X10 TS+ UNI 8113 ZINCATE Cr.3 295000.0
441.02512ZN VITI TRILOBATE 2.5X12 TS+ UNI 8113 ZINCATE Cr.3 389300.0
441.02515ZN VITI TRILOBATE 2.5X15 TS+ UNI 8113 ZINCATE Cr.3 1035000.0
441.0306ZN VITI TRILOBATE 3X 6 TS+ UNI 8113 ZINCATE Cr.3 287200.0
441.0308ZN VITI TRILOBATE 3X 8 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.0310ZN VITI TRILOBATE 3X10 TS+ UNI 8113 ZINCATE Cr.3 102900.0
441.0310ZO VITI TRILOBATE 3X10 TS+ UNI 8113 Z.NERE Cr.3 0.0
441.0312ZN VITI TRILOBATE 3X12 TS+ UNI 8113 ZINCATE Cr.3 492000.0
441.0315ZN VITI TRILOBATE 3X15 TS+ UNI 8113 ZINCATE Cr.3 301000.0
441.0320ZN VITI TRILOBATE 3X20 TS+ UNI 8113 ZINCATE Cr.3 90000.0
441.0325ZN VITI TRILOBATE 3X25 TS+ UNI 8113 ZINCATE Cr.3 187950.0
441.03506ZN VITI TRILOBATE 3.5X 6 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.03508ZN VITI TRILOBATE 3.5X 8 TS+ UNI 8113 ZINCATE Cr.3 137900.0
441.03512ZN VITI TRILOBATE 3.5X12 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.03512ZO VITI TRILOBATE 3.5X12 TS+ UNI 8113 Z. NERE Cr.3 0.0
441.0406ZN VITI TRILOBATE 4X 6 TS+ UNI 8113 ZINCATE Cr.3 162800.0
441.0407ZN VITI TRILOBATE 4X 7 TS+ UNI 8113 ZINCATE Cr.3 96000.0
441.0408ZN VITI TRILOBATE 4X 8 TS+ UNI 8113 ZINCATE Cr.3 116750.0
441.0410ZN VITI TRILOBATE 4X10 TS+ UNI 8113 ZINCATE Cr.3 203000.0
441.0410ZO VITI TRILOBATE 4X10 TS+ UNI 8113 Z. NERE Cr.3 0.0
441.0412ZN VITI TRILOBATE 4X12 TS+ UNI 8113 ZINCATE Cr.3 126500.0
441.0412ZO VITI TRILOBATE 4X12 TS+ UNI 8113 Z.NERO Cr.3 0.0
441.0415ZN VITI TRILOBATE 4X15 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.0415ZO VITI TRILOBATE 4X15 TS+ UNI 8113 Z.NERO Cr.3 0.0
441.0420ZN VITI TRILOBATE 4X20 TS+ UNI 8113 ZINCATE Cr.3 40000.0
441.0425ZN VITI TRILOBATE 4X25 TS+ UNI 8113 ZINCATE Cr.3 37000.0
441.0430ZN VITI TRILOBATE 4X30 TS+ UNI 8113 ZINCATE Cr.3 154000.0
441.0506ZN VITI TRILOBATE 5X 6 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.0508ZN VITI TRILOBATE 5X 8 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.0510ZN VITI TRILOBATE 5X10 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.0512ZN VITI TRILOBATE 5X12 TS+ UNI 8113 ZINCATE Cr.3 70000.0
441.0512ZO VITI TRILOBATE 5X12 TS+ UNI 8113 Z.NERO Cr.3 0.0
441.0515ZN VITI TRILOBATE 5X15 TS+ UNI 8113 ZINCATE Cr.3 151900.0
441.0520ZN VITI TRILOBATE 5X20 TS+ UNI 8113 ZINCATE Cr.3 222000.0
441.0525ZN VITI TRILOBATE 5X25 TS+ UNI 8113 ZINCATE Cr.3 150000.0
441.0530ZN VITI TRILOBATE 5X30 TS+ UNI 8113 ZINCATE Cr.3 215500.0
441.0532ZN VITI TRILOBATE 5X32 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.0534ZN VITI TRILOBATE 5X34 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.0535ZN VITI TRILOBATE 5X35 TS+ UNI 8113 ZINCATE Cr.3 56000.0
441.0535ZO VITI TRILOBATE 5X35 TS+ UNI 8113 Z.NERO Cr.3 0.0
441.0540ZN VITI TRILOBATE 5X40 TS+ UNI 8113 ZINCATE Cr.3 13700.0
441.0612ZN VITI TRILOBATE 6X12 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.0615ZN VITI TRILOBATE 6X15 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.0620ZN VITI TRILOBATE 6X20 TS+ UNI 8113 ZINCATE Cr.3 53091.0
441.0625ZN VITI TRILOBATE 6X25 TS+ UNI 8113 ZINCATE Cr.3 51500.0
441.0630ZN VITI TRILOBATE 6X30 TS+ UNI 8113 ZINCATE Cr.3 90000.0
441.0820ZN VITI TRILOBATE 8X20 TS+ UNI 8113 ZINCATE Cr.3 0.0
441.0820ZO VITI TRILOBATE 8X20 TS+ UNI 8113 Z.NERE 0.0