Product category:
Fasteners, threaded and non-threaded
News Release from: J Lanfranco | Subject: ESL, ERM and HCE
Edited by the Engineeringtalk Editorial
Team on 24 June 2004
Self-locking nuts boost assembly
reliability
Lanfranco's ESL, ERM and HCE nuts and locking strips are designed to provide secure fixings for the railway, military, public works and energy sectors.
Lanfranco's ESL, ERM and HCE nuts and locking strips are designed to provide secure fixings for the railway, military, public works and energy sectors Their self-locking capability ensures complete assembly reliability that has been confirmed through vibration loosening tests conducted by CETIM, France's mechanical engineering technical centre
This article was originally published on Engineeringtalk on 5 Jun 2002 at 8.00am (UK)
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Unlike other self-locking nuts on the market, Lanfranco nuts can be reused up to 25 times.
They provide strong resistance to vibration and ensure high-security fitting, in particular for the railroad sector.
Lanfranco recommends the ESL nut for both standard and safety assemblies.
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The self-locking system used consists of compressing the sides of several screw threads in two zones.
ESL nuts are especially used in the railroad sector for fixing parts under the chassis (compressors, transformers, air-conditioning units, cabinets for various equipment), as well as for bolting shock absorbers, traction motors, pantograph strips and brakes.
ERM nuts use the same self-locking system as the ESL but also have an integrated conical washer that maintains tension in the assembly.
These nuts are used for all standard and safety assembly jobs that require parts to remain stressed.
They are recommended for electrical connections (shunts), assemblies of several superposed items and flexible materials such as composites and elastomers.
HCE nuts are most commonly used for standard and safety assemblies with several nuts and whose cost must be controlled.
For example, in the railroad sector, HCE nuts are ideal for rail laying.
The self-locking system used for them entails the compression of one or two threads in a zone.
Lanfranco's locking strips are multipoint self-locking fittings that are positioned in a section with specific center distances (defined by the client) and provide lateral freedom of movement.
These modular assembly fittings are generally used to connect several locating points for one piece in a single operation without the need to respect precise centre distances or counter-drilling.
The locking nuts offer excellent resistance to temperature depending on the protective coating chosen.
They can be made of different materials including carbon and alloy steels, stainless steel, nonferrous metals and titanium, and can be tapped according to standards such as ISO, inch and gas thread.
The fittings can be supplied with numerous types of corrosion proof, anti-seizing or even aesthetic coatings.
The self-locking torque of these nuts conforms to the NFEN ISO2320 standard for steel and NFE25035 for stainless steel.
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