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Trailer Axles and Suspension Systems
Air Suspensions
SAF Air Fixed Frame Suspensions
SAF CBXu Underslung
SAF CBXu Underslung
SAF CBXu Underslung
SAF CBXu Underslung
SAF CBXu Underslung
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SAF CBXu Underslung

The SAF CBXu Underslung Fixed Frame Air Suspensions are designed with low-ride heights for low-profile trailer applications. 

Product inquiry
Product information

The SAF CBXu Underslung Fixed Frame Air Suspension delivers durability in a lightweight system for low-profile on/off-highway trailer applications with multiple configurations.

The CBXu Underslung Fixed Air Suspension features:

  • SwingAlign™ for Fast and Accurate Axle Alignment  
  • Multi-functional pivot bushing with exterior void design
  • Optional P89™ PSP7 or P89 Plus™ Air Disc Brakes
  • Optional SC5 Dressed Drum Wheel End Package with 5-Year Warranty
  • 25/30k Capacity Models Available (Rated for 30k at Creep Speed)
  • Optional Tire Pilot Plus™ Tire Inflation System
  • Optional 5” Axle for Smaller Brake Configurations
  • CBXy Yoke Mount Model Available for Lowboy Trailer Applications
  • Black Armour® Corrosion Protection
  • Featuring Haldex Calipers and Actuators
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Technical data
Suspension Capacities:23,000 and 25,000 lbs. (10.4 and 11.3 t) 
Ride Heights:6” / 7” / 8” / 9” / 10” / 12”
Standard Axle Track:71.5” (optional 75.5” / 77.5” / 81.5” / 83.5”)
Technologies
SwingAlign™
SwingAlign™
P89™ Air Disc Brakes
P89™ Air Disc Brakes
SC5 Dressed Drum Brake Wheel Ends
SC5 Dressed Drum Brake Wheel Ends
Tire Pilot Plus™
Tire Pilot Plus™
Black Armour® Corrosion Protection
Black Armour® Corrosion Protection
Literature
View all
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AF® Trailer Air Ride Suspensions Will Be Equipped with Haldex Brand Height Control Valves (HCVs)
pdf / 758.42 KB
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SAF Trailer Axle Production Change Notification Bulletin for Tire Inflation Prep
pdf / 499.55 KB
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SAF Drum Brake Lining - New Color Code Change Bulletin
pdf / 424.18 KB
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Friction Material - New Markings Bulletin for SAF Drum Brakes
pdf / 308.62 KB
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SAF P89 Air Disc Brake Hub Change with MTIS (PSI) Tire Inflation System Bulletin
pdf / 148.66 KB
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SAF Air Spring Logo Change Bulletin
pdf / 249.96 KB
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SAF Hub/Wheel Bearing Lubrication Upgrade Bulletin for all Dressed Axles
pdf / 1.08 MB
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Consolidation & Standardization to the New \"SC5\" Dress Drum Brake Wheel End Package Bulletin for SAF CBX & ULX Series Trailer Suspension Systems
pdf / 336.28 KB
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SAF P89 Series Air Disc Brakes Product Line Announcement Bulletin
pdf / 856.20 KB
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SAF Drum Brake & P89 Air Disc Brake Axles with Axle Spindle Nuts Change Bulletin
pdf / 596.85 KB
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SAF Parallel (P-Style) Spindle Axles Change Bulletin for Drum Brake Axles Only
pdf / 489.80 KB
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Important Information - CB and CBX Series Suspension
pdf / 119.70 KB
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ABS Sensor Block for P89 Integral and P89 Plus
pdf / 247.56 KB
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Camshaft Enclosure Design Improvement Bulletin for SAF Trailer Drum Brake Axles
pdf / 243.76 KB
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ABS Tone Ring Change for SAF P89 PLUS Air Disc Brake Systems
pdf / 338.42 KB
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Important Information Service - ABS Sensor Block Replacement for the P89
pdf / 4.53 MB
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Important Information - Technology / SAF INTEGRAL Disc Brake Air Brake Chambers
pdf / 215.27 KB
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Spider Bearing Cam Seal Removal & Reassembly Instructions for SAF Series Drum Brake Axles
pdf / 166.69 KB
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Important Info Bulletin - SAF Drum Brake Product Update Bulletin. New Roller Guide replaces washer on camshaft
pdf / 122.37 KB
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SAF INTEGRAL Disc Brake Caliper Install product change notice
pdf / 57.77 KB
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SAF CBX Series Trailer Suspension INTEGRAL Disc Brake Product Change Notice
pdf / 79.84 KB
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SAF Trailer Axles with 85⁄8˝ Drum Brakes Marketing Bulletin
pdf / 482.66 KB
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Integral Disc Brake Wheel and Valve Stem Clearance Notification
pdf / 92.12 KB
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