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De-mountable vibration-free fasteners ensure a clear view

De-mountable vibration-free fasteners ensure a clear view With top models of BMW motorcycles capable of achieving 175bhp at 9,250 rpm, blistering acceleration of 0-100kph in less than three seconds and top speeds up to 140 mph it is essential that riders have a clear view before overtaking. A shaky rear view mirror is definitely unwelcome and a potential danger.

Aiming to increase on-road safety and optimise the manufacturing procedures of its motorcycles BMW has adopted SNAPLOC, the high performance vibration -free 'push-on/pull-off' fastening system developed and manufactured by International fastening and assembly technology specialist Böllhoff. The SNAPLOC system minimises vibration of the mirror assembly and allows quick and easy 'snap-fit' installation as well as disassembly for repair, replacement or servicing - all without the need for special tools.

The customised fastening solution comprises three SNAPLOC ball pins which are fitted to the metal frame of the motorcycle. These connect with three mating couplings which are press fitted into the engineering plastic mirror housing and held in place by an undercut. The ball pins, or studs, are injection over-moulded in glass filled nylon (PPA GF) engineering plastics around steel fasteners whose M6 threads are finished in a black Zn/Ni coating to enhance corrosion resistance. The receiving couplings are precision injection moulded in black EPDM - X: a grade of material that provides resistance to UV exposure and as well as the positive snap-fit and essential long term vibration absorption properties critical to this application.

Three basic designs of SNAPLOC couplings have been developed for plate fastenings, for mounting domes and fixing with adhesive. Different ball diameters accommodate a range of stress conditions while stud sizes and other physical dimensions can be varied to suit application requirements. Ball studs are injection over-moulded in engineering plastics around steel fasteners.
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