442


UNI 8114

TRILOBULAR SCREWS PHIL OVAL 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 the 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 the 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
442.0306ZN VITI TRILOBATE 3X 6 TSC+ UNI 8114 ZINCATE Cr.3 0.0
442.0307ZN VITI TRILOBATE 3X 7 TSC+ UNI 8114 ZINCATE Cr.3 0.0
442.0308ZN VITI TRILOBATE 3X 8 TSC+ UNI 8114 ZINCATE Cr.3 310000.0
442.0408BU VITI TRILOBATE 4X 8 TSC+ UNI 8114 BRUNITE 0.0
442.0412ZN VITI TRILOBATE 4X12 TSC+ UNI 8114 ZINCATE Cr.3 0.0
442.0412ZO VITI TRILOBATE 4X12 TSC+ UNI 8114 Z.NERO Cr.3 0.0
442.0414ZN VITI TRILOBATE 4X14 TSC+ UNI 8114 ZINCATE Cr.3 0.0
442.0415ZN VITI TRILOBATE 4X15 TSC+ UNI 8114 ZINCATE Cr.3 30000.0
442.0512ZN VITI TRILOBATE 5X12 TSC+ UNI 8114 ZINCATE Cr.3 0.0
442.0512ZO VITI TRILOBATE 5X12 TSC+ UNI 8114 Z. NERE CR.3 0.0
442.0516LT VITI TRILOBATE 5X16 TSC+ UNI 8114 LANTHANE 240 + TORQUE TENSION 15% 0.0
442.0516ZN VITI TRILOBATE 5X16 TSC+ UNI 8114 ZINCATE Cr.3 0.0
442.0516ZNT VITI TRILOBATE 5X16 TSC+ UNI 8114 ZINCO NICHEL TRASPARENTE 400h + LUBRIF. 0.0
442.0620ZN VITI TRILOBATE 6X20 TSC+ UNI 8114 ZINCATE Cr.3 0.0