Hagelnut makes jam nut yesterday's news

Jan. 1, 2005
The Hagelnut 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

The Hagelnut 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. The old three-piece design was recognized as being the most secure and reliable spindle nut system when installed in accordance with the TMC (Technology and Maintenance Council of the American Trucking Associations) Recommended Practice RP 618, Wheel End Adjustment Procedures. However, the old-style three-piece jam nut configurations were unable to be used for preload adjustment because the final jam-tightening operation of the outer nut would introduce excessive and uncontrollable preload. For that reason, the only assembly practice approved by most roller bearing manufacturers was limited to installing “end play”: a procedure unable to provide consistent results.

With the new SAE Standard J2535, it is now possible to assemble wheel end systems with controllable preload. The TMC recently published Recommended Practice RP 640, Alternate Wheel Bearing Adjustment Systems, which says in the section, “Adjustable Wheel End Systems” that “A nut fastener system is installed on the axle spindle to adjust the bearings either with limited end play or slight preload. Each fastener system manufacturer has definitive installation instructions.”

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

Voice your opinion!

To join the conversation, and become an exclusive member of FleetOwner, create an account today!

Sponsored Recommendations

Leveraging telematics to get the most from insurance

Fleet owners are quickly adopting telematics as part of their risk mitigation strategy. Here’s why.

Reliable EV Charging Solution for Last-Mile Delivery Fleets

Selecting the right EV charging infrastructure and the right partner to best solve your needs are critical. Learn which solution PepsiCo is choosing to power their fleet and help...

Overcoming Common Roadblocks Associated with Fleet Electrification at Scale

Fleets in the United States, are increasingly transitioning from internal combustion engine vehicles to electric vehicles. While this shift presents challenges, there are strategies...

Report: The 2024 State of Heavy-Duty Repair

From capitalizing on the latest revenue trends to implementing strategic financial planning—this report serves as a roadmap for navigating the challenges and opportunities of ...