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Available as a premium option on select VANTRAAX® and INTRAAX®  integrated air suspension models and standard on  ULTRAA-K® air slider systems. ZMD® technology eliminates shock absorbers from the maintenance equation by integrating the damping function traditionally performed by the shock within the air spring itself. ZMD air springs exchange pressurized air between the bellows and the piston. This patented air spring provides uniform and consistent damping over the life of the air spring.

Sales Literature

Service Literature

Ordering Guides

Model System
Capacity (lbs.)
Diameter (in.)
Ride Heights (in.) Notes
UTKNT 40K 40,000 LDA™ Large-Diameter Axle 16 Standard
HKANT 40K 40,000 LDA 16 Optional; Requires QUIK-DRAW®
AANT 23K 23,000 LDA 14, 15, 16, 17 Optional;  std. travel only
AAT 23K* 23,000 LDA 14, 15, 16, 17 Optional;  std. travel and limited rebound*
AAT 25K* 25,000 LDA 14, 15, 16, 17, 18, 19 Optional;  std. travel and limited rebound*

*RCA Raised-Center Axle is available on AAT23K models equipped with ZMD for both standard and limited rebound travel. Only 14" or 16" ride heights are available with limited rebound travel when spec'ing RCA.