Introduction
This information is intended as a guide for the proper specification and application of Dexter Axle running gear, associated components
and accessories.
Dexter offers a full line of trailer axles that can be used in many different applications. When specifying any pre-engineered components
such as axles, it is the responsibility of the trailer designer to insure compatibility with the vehicle and all of its sub‑systems.

Important Information
The information presented is meant to assist trailer manufacturers in the specification of their running gear components. Dexter Axle
does not warrant that the information given constitutes an approved trailer design or application. Dynamic loading, travel requirements
unique to the trailer design, unusual service conditions, trailer configurations, unequal load distribution, hitch or coupler arrangements
and towing vehicle suspension characteristics can significantly affect the performance of any trailer axle and/or suspension systems.
It remains the responsibility of the trailer manufacturer to evaluate, specify and test their trailer/running gear combination before
production and to certify it as such. While the information presented at the time of this writing is current, it is subject to change as
designs and components evolve over time.

Disclaimer of Warranty and Limitation of Liability
All users of this product catalog acknowledge that the information presented is significantly affected by factors within the exclusive
knowledge of the user including, among other things, service conditions, trailer configurations, load distributions, hitch and coupler
arrangements and tow vehicle suspension characteristics, that the users have independently investigated these factors and have solely
relied on those investigations when using this catalog, and that it is the responsibility of the user to adequately specify, evaluate and
test its trailer/running gear combinations.
DEXTER AXLE DISCLAIMS ALL WARRANTIES, WHETHER WRITTEN, ORAL OR IMPLIED, IN FACT OR IN LAW (INCLUDING ANY WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE), ASSOCIATED WITH THE USE OF THE CATALOG AND WITH ANY
INFORMATION PRESENTED BY THIS CATALOG.
Dexter Axle shall not be liable in damages (whether compensatory, punitive, direct, indirect, special, incidental or consequential) to any
user of this catalog under contract, tort, strict liability or any other theory of liability, and any user agrees to indemnify and hold Dexter
Axle harmless from any and all claims, actions or other proceedings (including attorney fees and court costs) arising out of the use of
this catalog to the extent said claims, actions or other proceedings do not arise out of the sole and exclusive negligence of Dexter Axle.

Load Ratings
The maximum load carrying capacity of any assembly is limited to the lowest load rating of any individual component selected. For
instance, the load rating of a pair of wheels may be lower than other axle components selected. If this is the case, the load carrying
capacity of the axle assembly is reduced accordingly. As a specific example, if a pair of wheels is rated at 1500 pounds each and is
used with other components rated at 4000 pounds per axle, the maximum load capacity is limited to 3000 pounds. If two tires are rated
at 1400 pounds each and are used on this assembly, the maximum load carrying capacity is limited to 2800 pounds.

Table of Contents
Models and Capacities

22,500-27,500 Lbs.................................................................................................................................................................... 3
Available Axle Tracks.................................................................................................................................................................... 3
Brake Performance...................................................................................................................................................................... 3

Hubs and Drums

12 1/4" x 7 1/2" Brake Size....................................................................................................................................................... 4
10 Stud on 8 3/4" Hubs with Inboard Drums...................................................................................................................... 4
8 Stud on 275mm (10.827") Hubs with Outboard Drums.................................................................................................... 5
3-Spoke Cast Wheels........................................................................................................................................................... 6
16 1/2" x 7" Brake Size.............................................................................................................................................................. 7
10 Stud on 11 1/4" Hubs with Inboard Drums.................................................................................................................... 7
10 Stud on 11 1/4" Hubs with Outboard Drums.................................................................................................................. 8
10 Stud on 285.75mm (11.25") Hub Piloted with Outboard Drums.................................................................................... 9
5-Spoke Cast Wheels.........................................................................................................................................................10
Cross Reference........................................................................................................................................................................11
Hubs & Drums; Wheels & Drums.......................................................................................................................................11
Bearings, Seals, and Caps.................................................................................................................................................12
Anti-Lock Braking Systems (ABS)..............................................................................................................................................13

Tires & Wheels

Clearances and Dimensions......................................................................................................................................................14
Application Information.............................................................................................................................................................15
Determining Maximum Spring Centers................................................................................................................................15
Tires, Wheels & Rims.......................................................................................................................................................... 16

Axle/Brake Components

12 1/4" x 7 1/2" Brake Size - ‘PQ’ Style...................................................................................................................................18
16 1/2" x 7" Brake Size - ‘Q’ Style............................................................................................................................................20

Tandem Air System

Tandem Air System....................................................................................................................................................................22

Camshafts

12 1/4" x 7 1/2" Brake Size.....................................................................................................................................................23
16 1/2" x 7" Brake Size............................................................................................................................................................24

Air Chambers

Service Air Chambers................................................................................................................................................................25
Spring Brake Air Chambers........................................................................................................................................................26
Tandem Axle Configurations.......................................................................................................................................................27

Suspensions

HDSS Underslung......................................................................................................................................................................29
HDSS Overslung........................................................................................................................................................................30

Limited Warranty

Dexter Axle Limited Warranty......................................................................................................................................................31

Video Gallery

Dexter Axle Video Gallery...........................................................................................................................................................32

2 | 2018.11

HEAVY DUTY CATALOG

22.5 - 27.5 LBS. AXLE CAPACITY

Models and Capacities
Beam

D-2L12
D-2M12
D-2H12
D-2L16
D-2M16
D-2H16

5" Light Wall
5" Medium Wall
5" Heavy Wall
5" Light Wall
5" Medium Wall
5" Heavy Wall

Brake
12 1/4" x 7 1/2"
12 1/4” x 7 1/2”
12 1/4” x 7 1/2”
16 1/2" x 7"
16 1/2” x 7”
16 1/2” x 7”

MODELS AND CAPACITIES: 22,500 – 27,500 LBS.

Model No.

Beam Capacity**

Highway w/Leaf Springs
22,500 Lbs.
25,000 Lbs.
27,500 Lbs.
22,500 Lbs.
25,000 Lbs.
27,500 Lbs.

Air Ride Suspension
n/a +
22,500 Lbs.
25,000 Lbs.
n/a +
22,500 Lbs.
25,000 Lbs.

** Allowable use of axle capacity ratings (type of service and track/spring center overhang dimension, etc.) and components vary with
application.
+ Light wall tube on models D-2L12 and D-2L16 is not approved for axles equipped with air ride suspensions.

Available Axle Tracks
Tracks are available from 48" to 124".

Brake Performance
The following brake models meet or exceed requirements set forth by Federal Motor Vehicle Safety Standards 121 when tested under the following
conditions:

Brake Size

Wheel Load
*(lbs.)

Rolling Radius
(in.)

A.L. Factor
(consisting of)
Type 30 A/C
6" Slack Adjuster
Type 30 A/C
6" Slack Adjuster

12 1/4" x 7 1/2"

10,000

15.7

16 1/2" x 7"

12,500

19.6

* Wheel Load per wheel end
The permitted use of axles and components, including the capacity ratings that are shown, vary with application and type of service. The capacities
indicated for tires, wheels and axles should be used for general guidelines only.
Dexter Axle disclaims all warranties, whether written, oral or implied, in fact or in law (including any warranty of
merchantability or fitness for a particular purpose), associated with the use of the manual and with any information
presented by this manual.

HEAVY DUTY CATALOG
22.5 - 27.5 LBS. AXLE CAPACITY

2018.11 | 3

HUBS & DRUMS: 12¼" X 7½" BRAKE SIZE

10 Stud on 8 3/4" Hubs With Inboard Drums
For use with 15" or 17.5" ball seat mounted steel disc wheels

8

3

5

7

9

10
11

13
14

1

6

Item
0
0
ns
ns
1
1
ns
ns
ns
3
4
5
5
6
7
8
9
9
10
10
11
12
13
14

12

Part No.

Qty

Description

Comments

008-277-71
008-277-70
008-277-29
008-277-28
008-277-04
008-277-05
008-277-23
008-277-22
024-200-01
031-026-01
031-027-01
025-056-02
025-056-01
009-040-01
005-102-00
006-047-00
006-069-02
006-069-01
006-070-02
006-070-01
071-124-00
021-038-02
005-100-00
007-157-00

1
1
1
1
1
1
1
1
1
1
1
10
10
1
10
10
10
10
10
10
1
1
6
6

LH Assembly Hub & Drum 10 Stud 8 3/4" BC
RH Assembly Hub & Drum 10 Stud 8 3/4" BC
LH Assembly Hub & Drum 10 Stud 8 3/4" BC ABS
RH Assembly Hub & Drum 10 Stud 8 3/4" BC ABS
LH Assembly Hub 10 Stud 8 3/4" BC
RH Assembly Hub 10 Stud 8 3/4" BC
LH Assembly Hub 10 Stud 8 3/4" BC ABS
RH Assembly Hub 10 Stud 8 3/4" BC ABS
ABS Tone Ring
Inner Bearing Cup (HM218210)
Outer Bearing Cup (HM212011)
LH Shoulder Stud
RH Shoulder Stud
Drum 12 1/4" x 7 1/2"
Washer
Hex Nut – Drum Mounting
LH Inner Cap Nut
RH Inner Cap Nut
LH Outer Cap Nut
RH Outer Cap Nut
Gasket – Oil Cap
Oil Cap (with vent plug)
Lock Washer – Oil Cap
Cap Screw – Oil Cap

Use Ball Seat Mtg. Steel Wheels
Use Ball Seat Mtg. Steel Wheels
Use Ball Seat Mtg. Steel Wheels
Use Ball Seat Mtg. Steel Wheels
Includes Items 3-5
Includes Items 3-5
Includes Items 3-5
Includes Items 3-5
Included with ABS Hubs

For Steel Disc Wheels
For Steel Disc Wheels

ns - not shown

Hub & Drum Dimensional Information
Item
A
B
C
D
E
F
G
H
I
J

Description
Cup to Cup
Cup to Mounting Face
Cup to End of Drum
Brake Diameter
Shoe Brake Width
Drum Overall Width
Pilot Diameter
Bolt Circle
Bolt Diameter
Hub Cap Hole Mtg

Inner Bearing Cup and Cone Overall Stack Thickness

4 | 2018.11

Dimensions
3.34"
.81"
10.57"
12.25"
7.50"
10.50"
7.12"
8.75"
3/4"
5/16"
6 Holes 5.50 BC
1.575"

HEAVY DUTY CATALOG

22.5 - 27.5 LBS. AXLE CAPACITY

8 Stud on 275mm (10.827") Hubs
With Outboard Drums
5

10
11
3

14

4
6

1

Item
0
ns
ns
ns
1
ns
ns
ns
ns
3
4
5
5
6
10
11
12
13
14

13

Part No.
008-396-70
008-396-72
008-396-71
008-396-73
008-396-05
008-396-06
008-396-07
008-396-08
024-200-01
031-026-01
031-027-01
007-194-00
007-195-00
009-116-01
006-118-00
071-124-00
021-038-02
005-100-00
007-157-00

Qty
1
1
1
1
1
1
1
1
1
1
1
8
8
1
8
1
1
6
6

12

Description

Comments

Assy Hub & Drum 8 Stud on 275mm BC
Assy Hub & Drum 8 Stud on 275mm BC
Assy Hub & Drum 8 Stud on 275mm BC ABS
Assy Hub & Drum 8 Stud on 275mm BC ABS
Assy Hub 8 Stud on 275mm
Assy Hub 8 Stud on 275mm
Assy Hub 8 Stud on 275mm ABS
Assy Hub 8 Stud on 275mm ABS
ABS Tone Ring
Inner Bearing Cup (HM218210)
Outer Bearing Cup (HM212011)
Stud, Press-In M22 x 1.5
Stud, Press-In M22 x 1.5
Drum 12 1/4" x 7 1/2"
Swivel Flange Nut
Gasket – Oil Cap
Oil Cap (with vent plug)
Lock Washer – Oil Cap
Cap Screw – Oil Cap

Use Pilot Mtg. Steel Wheels
Use Pilot Mtg. Aluminum Wheels
Use Pilot Mtg. Steel Wheels
Use Pilot Mtg. Aluminum Wheels
Includes Items 3-5 for Steel Wheels
Includes Items 3-5 for Aluminum Wheels
Included Items 3-5 for Steel Wheels
Includes Items 3-5 for Aluminum Wheels
Included with ABS Hubs

HUBS & DRUMS: 12¼" X 7½" BRAKE SIZE

For use with 17.5" or 19.5" 221mm piloted disc wheels

2.47" Stud Length for Steel Wheels
3.32" Stud Length for Aluminum Wheels

ns - not shown

Hub & Drum Dimensional Information
Item
A
B
C
D
E
F
G
H
I
J