HT Series

Top Mount Air Suspension

HT Top Mount Air Suspension

With hundreds of thousands of HT SERIES suspensions on trailers running on- and off-road around the world, these models have been the suspensions of choice for virtually every trailer application for nearly a decade. The HT SERIES delivers rugged dependability and outstanding ride quality and control for vans, platforms, dumps, tankers, dollies and pups, lowboys, auto haulers, trailers on flat cars, B-trains, Michigan trains and container chassis. Our patented TRI-FUNCTIONAL® Bushing in unison with a rigid beam and solid axle connection provides the ideal combination of ride softness and roll stability.

Hendrickson recommends reviewing our application guide when choosing the suspension that best meets your needs.  
 L707 Application Guide

HT Top Mount Air Suspension

Features and Benefits

Conventional Ride Heights

  • Single-axle capacities from 20,000 pounds to 30,000 pounds
  • Ride heights from 12 to 23 inches
  • Spacing from 49 to 122 inches, tri- or quad-axle up to 144 inches

Low Ride Heights

  • Single-axle capacities from 20,000 pounds to 30,000 pounds
  • Ride heights from 4 to 17 inches
  • Excellent ground clearance on liftable models
  • Axle spacing from 49 to 122 inches

Single-Axle Applications

  • The HT SERIES is available in a HIGH CONTROL version for use on trailers with multi-articulation points like doubles, triples, B-trains, dollies and full trailers
  • Single-axle capacities from 20,000 pounds to 30,000 pounds
  • Ride heights from 4 to 23 inches

Unparalleled Support

  • 5-year/500,000-mile structural warranty
  • Backed by thousands of dealers
  • Off-the-shelf replacement parts


  • Proven technology provides mile after mile of worry-free service
  • Voids positioned to optimally absorb all road forces
  • The ideal combination of ride softness and roll stability
  • Specially formulated rubber compound stands up to the toughest operating conditions
  • Only two long-life bushings in each suspension — fewer than any other design
  • Five- or seven-year warranty depending on application

Rigid Trailing Arm/Solid Axle Connection

  • Simplicity of design reduces the number of moving parts, bushings and fasteners for minimal maintenance
  • Provides superior stability while eliminating torque rods and stabilizer bars
  • Eliminates retorquing requirements
  • Low spring rate for exceptional ride quality
  • Compatible with industry standard axles
  • Large bore shocks for longer life

QUIK-ALIGN® Pivot Connection (Standard on Most Models)

  • Provides quick, easy axle realignment
  • Save time and money should axle realignment become necessary
  • TORQ-RITE® shear bolt eliminates guesswork
  • Realign using standard tools — no torque wrench or welding required
  • Optimize tire life


Base Model Reference Suspension Capacity1 (LBS.) Suspension Ride Height2 (IN.)
HT190T 20K 14, 15, 16, 17
HT230 23K 14, 15, 16, 17, 19
HT250T3 25K 12, 14, 15, 16, 17, 19
HT300T 30K 15, 16, 17, 19, 21, 23

1. Capacity of primary suspension only; axle not included.

2. Suspension ride heights must be set within Hendrickson specifications in order to provide load equalization among axles and to ensure proper suspension performance. Failure to maintain proper ride height settings can lead to suspension, axle or trailer damage.

3. The HT250T is intended for use as a liftable suspension, in combination with other HT primary models. It may also be used in place of an HT230 when the application calls for high travel or low ride height.


File Name Rev. Date Size
L1185 - Side Beam Lift (SBL) Flyer A 06/20 0.55 MB
L610 - MAXILIFT® Low Deck Height Trailer Lift and Lock System Operator's Guide 05/98 0.13 MB
L632 - HT Brochure J 12/19 1.43 MB
L633 - Application Questionnaire E 09/19 0.25 MB
L667 - High Control for INTRAAX and HT Series C 06/20 0.21 MB
L707 - Trailer Application Guide M 01/20 0.29 MB
L761 - Understanding Air Ride J 01/20 4.79 MB
L801 - Liftable Suspension Guide E 11/19 1.2 MB
L977 - Trailer Suspension Systems and Axle Systems Identification Guide I 11/19 3.52 MB
Ordering Guides
E1259 - B2AHT Beam-To-Axle – WABCO PAN17 Electronic Ordering Guide C 03/21 0.28 MB
Parts List
L1182 - Controls Parts Catalog I 03/20 1.83 MB
L1266 - Frame Brackets Parts List H 06/20 0.44 MB
L1287 - Shock and Shock Strap Parts List F 08/20 0.36 MB
L38 - HT230 Top-Mount Parts List G 03/21 4.39 MB
L589 - TRI-FUNCTIONAL® Bushing Replacement Tool Parts List G 07/19 0.17 MB
L720 - Service Tools D 04/19 0.77 MB
L936 - HT190T Top Mount Parts List A 06/19 1.01 MB
L937 - HT250T Top Mount Parts List C 06/19 2.5 MB
L939 - HT300T Top Mount Parts List C 03/21 1.22 MB
L885 - MAXILIFT Specifications C 11/19 0.19 MB
Installation Drawings
D-24171 - HT300 ARL Kit Clevis and Flat Bracket 8 04/05 0.13 MB
D-33380 - UBL-201/202/301/302 BOLT-ON AAL & HT250T (301/302 Only) Installation Drawing 4 06/20 0.32 MB
B106 - Pivot Bushing Inspection Procedure D 05/18 0.82 MB
L1111 - Slider Pin Washer Installation - 08/08 0.08 MB
L427 - Bushing Replacement Procedure H 02/19 2.61 MB
L577 - HT Suspension Installation Procedures D 01/21 1.77 MB
L64 - Welding Procedures G 04/16 1.62 MB
L725 - HT250US, HT300US and CXU Shock Mount Replacement Procedures B 09/18 0.57 MB
L750 - Bushing Tube Spacer Inspection/Replacement Procedure D 10/20 1.33 MB
T19002 - Trailer Patent Information O 02/21 0.14 MB
T44004 - HT Suspension Information and Requirements - 09/19 0.54 MB
L904 - HT250US/HT250U/HT250T Suspension PSI/Load Scale Decal D 11/19 0.04 MB
L904SP - Espanol HT250US/HT250U/HT250T Suspension PSI/Load Scale Decal D 12/19 0.04 MB
L583 - Trailer Comprehensive Warranty Statement AC 11/20 0.59 MB
L583FR - Énoncé intégral de la garantie États-Unis et Canada AC 02/21 0.6 MB

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