441TX


TRILOBULAR TORX FLAT HEAD THREAD FORMING SCREWS



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 use of Torx allows to transmit a higher tightening torque than other impressions. It is a universal type of impression, unlike the specific ones that are used in the various countries of the world (cross, philips, pozi, slotted, square impressions and so on). Torx is particularly suitable for diameters from 4 upwards; applying it on smaller diameters is not particularly recommended as the reduced depth of the impression with respect to a cross can create problems during assembly. Precisely for this reason, if they are not mounted perfectly in line with the holes and with the screwdriver, the insert could escape from the screw seat.

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



Code Description Availability Certifications Request offer
441TX.02510ZN VITI TRILOBATE 2.5X10 TS TORX T10 ZINCATE 112600.0
441TX.0308ZN VITI TRILOBATE 3X 8 TS TORX T10 ZINCATE CR.3 60000.0
441TX.0310ZN VITI TRILOBATE 3X10 TS TORX T10 ZINCATE 99200.0
441TX.0312ZN VITI TRILOBATE 3X12 TS TORX T10 ZINCATE 0.0
441TX.0406ZN VITI TRILOBATE 4X 6 TS TX T20 ZINCATE 72150.0
441TX.0408ZN VITI TRILOBATE 4X 8 TS TORX T20 ZINCATE Cr.3 64000.0
441TX.0410ZN VITI TRILOBATE 4X10 TS TORX T20 ZINCATE CR.3 0.0
441TX.0412ZN VITI TRILOBATE 4X12 TS TORX T20 ZINCATE CR.3 0.0
441TX.0415ZN VITI TRILOBATE 4X15 TS TORX T20 ZINCATE CR.3 0.0
441TX.0416ZN VITI TRILOBATE 4X16 TS TORX T20 ZINCATE CR.3 0.0
441TX.0418ZN VITI TRILOBATE 4X18 TS TORX T20 ZINCATE CR.3 0.0
441TX.0420ZN VITI TRILOBATE 4X20 TS TORX T20 ZINCATE CR.3 128025.0
441TX.0420ZO VITI TRILOBATE 4X20 TS TORX T20 ZINCATE NERE CR.3 0.0
441TX.0430ZN VITI TRILOBATE 4X30 TS TORX T20 ZINCATE CR.3 14175.0
441TX.0508ZN VITI TRILOBATE 5X8 TS TORX T25 ZINCATE Cr.3 0.0
441TX.0510ZN VITI TRILOBATE 5X10 TS TORX T25 ZINCATE Cr.3 304300.0
441TX.0512LT VITI TRILOBATE 5X12 TS TORX T25 ZINCATE LANTHANE 0.0
441TX.0515ZN VITI TRILOBATE 5X15 TS TORX T25 ZINCATE Cr.3 292150.0
441TX.0520LT VITI TRILOBATE 5X20 TS TORX T25 ZINCATE LANTHANE + FINIGARD 0.0
441TX.0520ZN VITI TRILOBATE 5X20 TS TORX T25 ZINCATE Cr.3 304400.0
441TX.0525ZN VITI TRILOBATE 5X25 TS TORX T25 ZINCATE Cr.3 0.0
441TX.0612ZN VITI TRILOBATE 6X12 TS TORX T30 UNI 8113 ZINCATE Cr.3 0.0
441TX.0615ZN VITI TRILOBATE 6X15 TS TORX UNI 8113 ZINCATE Cr.3 0.0
441TX.0625ZN VITI TRILOBATE 6X25 TS TORX UNI 8113 ZINCATE Cr.3 0.0
441TX.0816ZN VITI TRILOBATE 8X16 TS TORX T40 ZINCATE CR.3 0.0
441TX.0818ZN VITI TRILOBATE 8X18 TS TORX T40 ZINCATE CR.3 0.0
441TX.0820ZN VITI TRILOBATE 8X20 TS TORX T40 ISO 14581 ZINCATE CR.3 0.0
441TX.0825LT VITI TRILOBATE 8X25 TS TORX T40 LANTHANE 0.0
441TX.0830ZN VITI TRILOBATE 8X30 TS TORX T40 ZINCATE CR.3 0.0