Hendrickson van / reefer slider boxes were manufactured in three designs. In order to determine the box type,
check to see if the cross members are in a ladder orientation or if the orientation forms two K’s or one K.
If the orientation forms a ladder, refer to the illustration below. If the cross members form the “K” orientation,
use the dimensions provided on pages 17 and 18 to determine which model that you have.

HS Slider Box
• HS190 / 230 Tandem

Box height is 10"

Cross member
ladder orientation

16

L977 Rev H

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS
ULTRAA-K® UTKNT Slider Box
• UTKNT 40K Tandem
Box height is 8"

“K” bracing

Frame bracket
width is 4.03"

Bottom width of
trailer frame rail is 4.00"

VANTRAAX HKANT Slider Box
• HKANT 23K Single
• HKANT 40K Tandem
• HKANT 46K Tandem
• HKANT 46K 121" Wide Spread Tandem
• HKANT 69K23 Tridem

Box height is 8"

“K” bracing

(HKANT 40K Shown)

Frame bracket
width is 4.12"

Bottom width of
trailer frame rail is 4.88"

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17

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS
VANTRAAX® HKAT Slider Box
• HKAT 46K Tandem
• HKAT 50K Tandem (K-brace Reinforced)
• HKAT 69K23 Tridem
• HKAT 69K25 Tridem

K-brace reinforcement (50K)
Box height is 8"

VANTRAAX HKAL Slider Box
• HKAL 46K Tandem

HK Series Slider Box
• HK190 / 230 Tandem
“K” bracing

(HKAT 50K Shown)

Frame bracket width
is 7.25"

Bottom width of
trailer frame rail is 7.69"

VANTRAAX HKARL Slider Box
• HKARL 46K Ramp Ready Tandem
Box height is 14"

HTHKR Slider Box
• HTHKR 200U Ramp Ready Tandem
“K” bracing

Integrated ramp bay
(Ramp-Ready models only)

(HKARL 46K Shown)

Frame bracket
width is 7.25"
Bottom width of
trailer frame rail is 7.69"

18

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IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS

SLIDER SUSPENSIONS — PLATFORM APPLICATIONS
Hendrickson platform slider boxes feature a “Z-rail” style box that is designed to fit between the trailer I-beams
with the locking pins engaging through the holes in the web of the beams. Refer to the illustrations below to
determine if you have a top mount or low-ride model.

INTRAAX®-SP AAZL Slider Box

Box height is 6.06"

• AAZL 23K Single
• AAZL 46K Tandem

(AAZL 46K Shown)

Hanger width is 7.25"
Bottom width of
trailer frame rail is 6.06"

Box height is 6.06"

INTRAAX-SP AAZNT Slider Box
• AAZNT 23K Single
• AAZNT 46K Tandem
• AAZNT 69K23 Tridem

(AAZNT 46K Shown)

Hanger width is 4.12"
Bottom width of
trailer frame rail is 6.06"

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19

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS

PRIMARY SUSPENSIONS — VOCATIONAL APPLICATIONS
TOP-MOUNT SUSPENSIONS
Top-mount suspensions are those with the beam assembly on top of the axle. The illustrations show the distinguishing
characteristics of the various Hendrickson top-mount suspensions. In order to determine the suspension model,
find the illustration with the same identifying characteristics.

HT™ SERIES Top-Mount

• HT190T
• HT230T

Single combo stud air spring
8", 10" or 12"

Straight beam

Integrated axle seat
U-bolt

HT SERIES Top-Mount
• HT250T

Single combo stud air spring
8", 10" or 12"

Integrated axle seat
U-bolt

20

Straight beam with dropped
air spring seat

L977 Rev H

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS
HT™ SERIES Top-Mount
• HT300T

Double combo stud air spring
9", 11", 13"

Straight beam

Integrated axle seat
U-bolt

T Series Top-Mount (Legacy)

Double stud air spring
Varies

Straight beam

Separate axle seat
welded to beam

L977 Rev H

U-bolt

21

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS
UNDERSLUNG SUSPENSIONS
Underslung suspensions are those with the beam assembly under the axle. The illustrations show the distinguishing
characteristics of the various Hendrickson underslung suspensions. In order to determine the suspension model,
find the illustration with the same identifying characteristics.

Upper shock bracket mounts in frame
cross member (remote shock)

HT™ SERIES Underslung
• HT190U

Single combo stud air spring

U-Bolt
8",10" or
13.19"

Straight beam
Integrated Axle Seat
Upper shock bracket mounts
to trailer frame

HT SERIES UNDERSLUNG
• HT200UAM

U-Bolt
9" or 10"

Integrated Axle Seat

Double stud air spring
- One combo stud
- One standard stud

Straight beam

HT SERIES Underslung
• HT250US
• HT300US

Upper shock bracket mounts
to frame bracket
Single combo stud air spring (250US)
Double combo stud air spring (300US)

U-Bolt
4.5", 8",
10",12"
or 14"

Straight beam
Integrated Axle Seat
22

L977 Rev H

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS
HT SERIES Underslung
• HT250U

Upper shock bracket mounts
to frame bracket
U-Bolt

Single combo stud air spring

6.19",
8",10"
or 13.19"

Curved beam

Separate axle seat welded to beam

HT™ SERIES Underslung
• HT300U

Upper shock bracket mounts
to frame bracket
Double stud air spring
- One combo stud
- One standard stud

U-Bolt
10",13.19",
14.69" or
17.69"

Curved beam
Separate axle seat welded to beam

T Series Underslung (Legacy)
Separate axle seat welded to beam

U-Bolt
Double stud air spring
- One combo stud
- One standard stud

Varies

Upper shock bracket mounts
to the rear
Curved beam

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23

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS
Y-BEAM SUSPENSIONS
Y-Beam suspensions are those with the beam assembly under the axle and the suspension pivot bushing tubes integrated
into the trailer frame. The illustrations show the distinguishing characteristics of the various Hendrickson Y-beam suspensions.
In order to determine the suspension model, find the illustration with the same identifying characteristics.

HT SERIES Y-BEAM
• HT250YS
Upper shock bracket mounts to trailer frame
Single stud air spring

QUIK-ALIGN®
Straight beam

HT SERIES Y-BEAM
• HT250YB
• HT300YB

Upper shock bracket mounts to trailer frame
- Profile varies. See below
Air spring mounting varies. See below

QUIK-ALIGN

Curved beam

HT250YB

HT300YB

HT300YB

• Paired with HT250UB
• Single combo stud air spring

• Paired with HT300UB
• Double air spring stud
- One combo stud
- One standard stud

• Paired with HT300US
• Dual combo stud air spring

DO
NOT

WE
LD

24

L977 Rev H

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS

PRIMARY SUSPENSIONS — VOCATIONAL APPLICATIONS (INTRAAX®)
Hendrickson’s INTRAAX suspensions have an integrated axle and beam assembly. The illustrations show the
distinguishing characteristics of the various models. In order to determine the suspension model, find the
illustration with the same identifying characteristics.

INTRAAX Top-Mount
• AAT 23K / 25K / 30K
5.75" long
lower shock bolt

Hanger width is 7.25"

Manufactured
before December 2010
LDA™ Large-Diameter Axle
(5.75")
Air Spring mounting
located above the axle
With weld-on
air spring pedestal

Integrated axle and
beam assembly

INTRAAX Top-Mount

Manufactured
late August 2002 through 2008

• AANT 23K
5.75" long
lower shock bolt

Hanger
width 4.12"
With cast, bolt-on
air spring pedestal
Air Spring
mounting
located above
the axle

LDA Large-Diameter Axle
(5.75")

Integrated axle and
beam assembly

L977 Rev H

Manufactured
2001 through 2002

With 2-inch, weld-on
air spring pedestal

25

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS
INTRAAX Extreme-Duty Top-Mount
• AAEDT 30K

Hanger width is 7.25"

7.25" long lower
shock bolt

Standard axle (5")

Air Spring mounting seat
located above the axle

Integrated axle and
beam assembly

INTRAAX Extreme Duty Low-Ride / Liftable
• AAEDL 30K

7.25" long lower
shock bolt
Hanger width is 7.25"

Standard axle (5")

Dropped air spring
mounting seat located
behind the axle

Integrated axle and
beam assembly

26

L977 Rev H

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS
INTRAAX Low-Ride / Liftable
• AAL 23K / 25K / 30K
7.25" long lower
shock bolt

Hanger width is 7.25"

Dropped air spring
mounting seat located
behind the axle

LDA™ Large-Diameter Axle (5.75")
(Optional 5")

Integrated axle and
beam assembly

INTRAAX Low-Ride
• AANLS 20K
• AANL 23K

20K - 9.5" long lower shock bolt
23K - 5.75" long lower shock bolt

Hanger width is 4.12"

20K - Standard axle (5")

Dropped air spring
mounting seat located
behind the axle

23K - LDA Large-Diameter Axle (5.75")

Pivot bolt to center of axle distance
20K - 17.8"

Integrated axle and
beam assembly

23K - 19.5"
L977 Rev H

27

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS

SELF-STEER SUSPENSION — VOCATIONAL APPLICATIONS (CONNEX™-ST)
Hendrickson’s CONNEX-ST trailer self-steer suspensions combine the proven HT250T with its innovative steer axle
technology. The illustration shows the distinguishing characteristics of the CONNEX-ST model.

CONNEX-ST Liftable
• CXSL 25K

Lock straight assembly
Tie rod

Steering knuckle
assembly

28

L977 Rev H

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS

PRIMARY SUSPENSION — VOCATIONAL APPLICATIONS (CONNEX™)
Hendrickson’s CONNEX unitized trailer suspension system combines the proven HT™ SERIES suspension components
with TRLAXLE® non-integrated axle. The illustration shows the distinguishing characteristics of the CONNEX model.

CONNEX Underslung
• CXU 23K
• CXU 25K

CONNEX Y-Beam
• CXY 23K
• CXY 25K

L977 Rev H

29

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS

NOTES:

30

L977 Rev H

IDENTIFICATION GUIDE — TRAILER SUSPENSION AND AXLE SYSTEMS

NOTES:

L977 Rev H

31

Actual product performance may vary depending upon vehicle configuration, operation, service and other factors.
All applications must comply with applicable Hendrickson specifications and must be approved by the respective vehicle manufacturer with the vehicle in its original, as-built configuration.
Contact Hendrickson for additional details regarding specifications, applications, capacities, and operation, service and maintenance instructions.

Call Hendrickson at 330.489.0045 or 866.RIDEAIR (743.3247) for additional information.

www.hendrickson-intl.com

TRAILER COMMERCIAL VEHICLE SYSTEMS
2070 Industrial Place SE
Canton, OH 44707-2641 USA
866.RIDEAIR (743.3247)
330.489.0045 • Fax 800.696.4416

L977 Rev H 03-19

Hendrickson Canada
250 Chrysler Drive, Unit #3
Brampton, ON Canada L6S 6B6
800.668.5360
905.789.1030 • Fax 905.789.1033

Hendrickson Mexicana
Circuito El Marqués Sur #29
Parque Industrial El Marqués
Pob. El Colorado, Municipio El Marqués,
Querétaro, México C.P. 76246
+52 (442) 296.3600 • Fax +52 (442) 296.3601

© 2007 - 2019 Hendrickson USA, L.L.C. All Rights Reserved. All trademarks shown are owned by Hendrickson USA, L.L.C., or one of its affiliates, in one or more countries.
Information contained in this literature was accurate at the time of publication. Product changes may have been made after the copyright date that are not reflected.

Printed in United States of America