446


TRILOBULAR SCREWS HEX SOCKET HEAD
The self-forming trilobular screw is a triangular section screw with metric thread suitable for direct screwing in blind or through holes. Its main feature is to avoid the threading phase in steel and light alloy products. During screwing, this screw forms the thread plastically, i.e. by deforming the material, thus creating a play-free coupling between screw and nut, thus guaranteeing 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 length of the screw, 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 of 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 measured from the tip to the underhead.

Code Description Availability Certifications Request offer
446.0306ZN VITI TRILOBATE 3X 6 TCCE ZINCATE Cr.3 128000.0
446.0308ZN VITI TRILOBATE 3X 8 TCCE ZINCATE Cr.3 159000.0
446.0310ZN VITI TRILOBATE 3X10 TCCE ZINCATE Cr.3 158500.0
446.0312ZN VITI TRILOBATE 3X12 TCCE ZINCATE Cr.3 154000.0
446.0315ZN VITI TRILOBATE 3X15 TCCE ZINCATE Cr.3 157900.0
446.0320ZN VITI TRILOBATE 3X20 TCCE ZINCATE Cr.3 160300.0
446.0408ZN VITI TRILOBATE 4X 8 TCCE ZINCATE Cr.3 11150.0
446.0408ZO VITI TRILOBATE 4X 8 TCCE Z. NERE Cr.3 0.0
446.0410ZN VITI TRILOBATE 4X10 TCCE ZINCATE Cr.3 0.0
446.0412ZN VITI TRILOBATE 4X12 TCCE ZINCATE Cr.3 102900.0
446.0415ZN VITI TRILOBATE 4X15 TCCE ZINCATE Cr.3 18550.0
446.0420ZN VITI TRILOBATE 4X20 TCCE ZINCATE Cr.3 58000.0
446.0508ZN VITI TRILOBATE 5X 8 TCCE ZINCATE Cr.3 0.0
446.0510ZN VITI TRILOBATE 5X10 TCCE ZINCATE Cr.3 279100.0
446.0510ZO VITI TRILOBATE 5X10 TCCE Z. NERE Cr.3 0.0
446.0512ZN VITI TRILOBATE 5X12 TCCE ZINCATE Cr.3 0.0
446.0515ZN VITI TRILOBATE 5X15 TCCE ZINCATE Cr.3 17165.0
446.0515ZO VITI TRILOBATE 5X15 TCCE ZINCATE NERO Cr.3 0.0
446.0518ZN VITI TRILOBATE 5X18 TCCE ZINCATE Cr.3 21042.0
446.0520ZN VITI TRILOBATE 5X20 TCCE ZINCATE Cr.3 220350.0
446.0525ZN VITI TRILOBATE 5X25 TCCE ZINCATE Cr.3 178900.0
446.0530ZN VITI TRILOBATE 5X30 TCCE ZINCATE Cr.3 108900.0
446.0535ZN VITI TRILOBATE 5X35 TCCE ZINCATE Cr.3 111600.0
446.0610ZN VITI TRILOBATE 6X10 TCCE ZINCATE Cr.3 0.0
446.0612ZN VITI TRILOBATE 6X12 TCCE ZINCATE Cr.3 183750.0
446.0615ZN VITI TRILOBATE 6X15 TCCE ZINCATE Cr.3 222500.0
446.0620ZN VITI TRILOBATE 6X20 TCCE ZINCATE Cr.3 155800.0
446.0622ZN VITI TRILOBATE 6X22 TCCE ZINCATE Cr.3 0.0
446.0625ZN VITI TRILOBATE 6X25 TCCE ZINCATE Cr.3 184000.0
446.0630ZN VITI TRILOBATE 6X30 TCCE ZINCATE Cr.3 102000.0
446.0635ZN VITI TRILOBATE 6X35 TCCE ZINCATE Cr.3 102300.0
446.0640ZN VITI TRILOBATE 6X40 TCCE ZINCATE Cr.3 41150.0
446.0650ZN VITI TRILOBATE 6X50 TCCE ZINCATE Cr.3 44750.0
446.0660ZN VITI TRILOBATE 6X60 TCCE ZINCATE Cr.3 39970.0
446.0670ZN VITI TRILOBATE 6X70 TCCE ZINCATE Cr.3 40250.0
446.0812ZN VITI TRILOBATE 8X12 TCCE ZINCATE Cr.3 51000.0
446.0815ZN VITI TRILOBATE 8X15 TCCE ZINCATE Cr.3 36575.0
446.0820ZN VITI TRILOBATE 8X20 TCCE ZINCATE Cr.3 66400.0
446.0825ZN VITI TRILOBATE 8X25 TCCE ZINCATE Cr.3 51450.0
446.0830ZN VITI TRILOBATE 8X30 TCCE ZINCATE Cr.3 52350.0
446.0835ZN VITI TRILOBATE 8X35 TCCE ZINCATE Cr.3 14855.0
446.0840ZN VITI TRILOBATE 8X40 TCCE ZINCATE Cr.3 4270.0
446.0845ZN VITI TRILOBATE 8X45 TCCE ZINCATE Cr.3 5950.0
446.0850ZN VITI TRILOBATE 8X50 TCCE ZINCATE Cr.3 7930.0