ULTIMAAX® for Fire/Rescue

Advanced severe-duty rear rubber suspension for fire and rescue applications

ULTIMAAX FIRE 48K-65K Fire/Rescue Rubber Suspension

Hendrickson has employed the latest engineering advancements and expertise to develop the ULTIMAAX® 48K – 65K rubber suspension, designed specifically for the fire and rescue market.  The integration of Hendrickson's proven walking (equalizing) beam technology, with its patented progressive rate spring, provides a balance of loaded stability and unloaded ride quality.

ULTIMAAX FIRE 48K-65K Fire/Rescue Rubber Suspension

Features and Benefits

  • Recommended for fire / rescue applications
  • Superior ride results in reduced road shock and vibration to the vehicle, which
    contributes to longer service life of the cab, chassis and body equipment
  • No lubrication requirements
  • Progressive load springs provide long service life and are easy to replace
  • Bar pin end bushings designed to extend service life and reduce re-bush time
  • Comprehensive technical support and training available
  • Optimized design to balance robust durability and weight savings
  • Progressive rate springs provide a unique balance of unloaded ride quality and loaded stability
  • Fabricated walking-beam design equalizes axle loading while providing optimal clearance, axle travel and weight
  • Capacities up to 65,000 lbs.


Suspension Rating (lbs.) 48,000-65,000
GVW Approval1 Unlimited2
GCV Approval Unlimited2
Diagonal Articulation3(in.) 17.5
Ride Heights (in.) 9.5 to 13
Axle Spacing (in.)4 54, 56, 60

Hendrickson approves the use of ULTIMAAX® in fire / rescue applications. All applications must comply with applicable Hendrickson specifications and must also be approved by the respective vehicle manufacturer with the vehicle in its original, as-built configuration. Contact Hendrickson and the respective vehicle manufacturer for approval of additional applications.

1. Contact Hendrickson for applications that may exceed GVW approval ratings.
2. Suspension must be paired with appropriate axle rating.
3. Suspension articulation may exceed vehicle’s capability and may be limited by vehicle manufacturer; vehicle manufacturer installed axle stops may restrict
suspension’s articulation.
4. Contact Hendrickson for availability of additional beam lengths.
For additional details regarding specifications, applications, capacities, operating service and maintenance instructions, refer to applicable Hendrickson
technical literature (available at www.hendrickson-intl.com) or contact Hendrickson at 630-910-2800630-910-2800.
Actual product performance may vary depending upon vehicle configuration, operation, service and other factors.
U.S. and foreign patents granted and / or pending.


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