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Sep 1, 2004 12:00 PM

The Hagelnut spindle nut system is an improved adaptation of the conventional three-piece jam nut used for years as the primary wheel end retention system in the tractor-trailer industry. Old-style jam nut configurations could not be used for preload adjustment of tapered roller bearings because the final jam-tightening operation of the outer nut could introduce excessive and uncontrollable preload. The Hagelnut provides installation of controllable preload when installed properly.

Done correctly, the wheel end assembly is installed with a controlled amount of wheel bearing preload sufficient to assure ideal running conditions. This eliminates any possibility of the wheel installation being too tight or with any degree of looseness due to the installation process.

The retainer nut cannot be moved because the nub engaged by the hole in the intermediate washer cannot be moved to allow disengagement until the adjustment nut has been retightened to eliminate intended interference. This is the Hagelnut's patent-pending design feature for added reliability of fastener assembly.

For special requirements, unitized hub assemblies using cartridge bearings could also benefit from the advantages provided by the Hagelnut system. Some compliance would be necessary with the positioning of the adjustment nut to allow lateral movement needed for disassembly.

For complete details, contact Rather Engineering, 414 S York, Dearborn MI 48124.