J. LANFRANCO & Cie offers a wide range of slotted self-locking nuts – ESL, ERM and THU – designed to meet the specific requirements of railway applications.
The ESL, J. LANFRANCO’s flagship all-metal nut, is reusable and suitable for a very large number of railway, passenger vehicle and track applications. The self-locking system is provided by the two overlapping slots located on the upper part of the turret of the nut.
Also available is the THU all-metal, reusable hexagonal nut – with two slots on the same plane in the turret. This also comes in a low version (THM), offering flexibility of application according to specific constraints. Unlike other models, such as the ESL, which have slightly higher self-locking performance, the significant advantage of the THU and THM is that they can be used without specific tools, such as torque wrenches. This avoids dispersion due to the human factor and ensures consistent performance even with used materials.
The choice of the nut depends on the specific constraints of each application. The THU stands out for its ability to maintain its performance. It is particularly suitable for environments subject to extreme stresses, intense vibrations, variations in conditions and wear of equipment. This versatility is particularly advantageous for freight networks, where loads and speeds vary considerably in South America, North America and Australia.
The THU nut has proven its effectiveness in a variety of applications, ranging from metro and TGV infrastructure to secondary freight networks around the world.
Its design and ability to operate without torque accuracy make it an ideal choice for railway infrastructure and other applications under severe stress. “We have chosen a constant evolution to meet the technical needs of our customers. We integrate normative updates, improve friction coefficients and select the nuts best suited to each assembly,” highlights J. Lanfranco & Cie.
Having spent a decade in the fastener industry experiencing every facet – from steel mills, fastener manufacturers, wholesalers, distributors, as well as machinery builders and plating + coating companies, Claire has developed an in-depth knowledge of all things fasteners.
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