NHTSA ID Number: 10165835
Manufacturer Communication Number: pb409
TSB/Document Date: 2019-10-14
Summary
Wheel Attachment and Torque Requirements Product Bulletin
PRODUCT BULLETIN #409
Page 1 of 3
Date: October 14, 2019
Subject: Wheel Attachment and Torque Requirements
Dexter
would like to REITERATE the extreme importance of properly matching your axles, wheels, and tires when specifying or replacing
your trailer wheels. It is of equal importance that you apply and maintain proper wheel mounting torque on your trailer axle. Please follow
the wheel selection, torque requirement, and torque sequence guidelines below. This information can also be found on our website,
www.dexteraxle.com.
Wheel Selection
Wheels are a very important and critical component of your running gear system. When specifying or replacing your trailer wheels it is
important that the wheels, tires, and axle are properly matched. The following characteristics are extremely important and should be
thoroughly checked when replacement wheels are considered.
1. Bolt Circle: Many bolt circle dimensions are available and some vary by so little that it might be possible to attach an improper wheel
that does not match the axle hub. Be sure to match your wheel to the axle hub, bolt circle, hub pilot and wheel mount surface to
hub face. Also confirm that proper studs stick out.
2. Capacity. Make sure that the wheels have enough load carrying capacity and pressure rating to match the maximum load of the axle
tire and trailer.
3. Offset. This refers to the relationship of the center line of the tire to the hub face of the axle. Care should be taken to match any
replacement wheel with the same offset wheel as originally equipped. Failure to match offset can result in reducing the load carrying
capacity of your axle.
4. Rim Contour.
!
CAUTION
Replacement tires must meet the same specifications as the originals. Mismatched tires and rims may come apart with
explosive force and cause personal injury to yourself or others. Mismatched tires and rims can also blow out and cause you
to lose control and have an accident which can result in serious injury or death.
!
CAUTION
Do not attempt to repair or modify a wheel. Even minor modifications can have a great effect. Do not install a tube to
correct a leak through the rim. If the rim is cracked, the air pressure in the tube may cause the pieces of the rim to explode
with great force and can cause serious injury or death.
Torque Requirements
You should always consult with the wheel manufacturer to determine the appropriate torque level for you wheels. It is extremely important
to apply and maintain proper wheel mounting torque on your trailer axle. Torque is a measure of the amount of tightening applied to a
fastener (nut or bolt) and is expressed as length times force. For example, a force of 90 pounds applied at the end of a wrench one foot
long will yield 90 Ft. Lbs. of torque. Torque wrenches are the proper method to ensure torque is applied correctly to a fastener.
!
CAUTION
Wheel nuts or bolts must be tightened and maintained at the proper torque levels to prevent loose wheels, broken studs,
and possible dangerous separation of wheels from your axle, which can lead to an accident, personal injuries or death.
Be sure to use only the fasteners matched to the cone angle of your wheel (usually 60° or 90°). The proper procedure for attaching
your wheels is as follows:
1. Start all nuts/bolts by hand to prevent cross threading.
Dexter Axle Company
Phone: (574) 295-7888
2900 Industrial Parkway East
www.dexteraxle.com
Elkhart, IN 46516
Fax: (574) 295-8666
PRODUCT BULLETIN #409
Page 2 of 3
2. The tightening should be done in stages:
a. Initially snug (10 ft-lb) the nuts/bolts to align and seat the wheel to the hub, in the order described in the torque sequence
diagram below.
b. Tighten the nuts/bolts performing the wheel torque sequence below.
3. Wheel nuts/bolts should be torqued before first road use and after each wheel removal. Check and re-torque after the first 10
miles, 25 miles and again at 50 miles. Check periodically thereafter, THIS IS VERY IMPORTANT.
4. Wheel nuts are designed to have full thread engagement with the wheel stud. Wheel stud threads should be visible outside
the wheel nut. There will be varying amounts of thread stick out depending on variables such as center disc thickness and nut
thickness. In general, there should be approximately three threads visible past the end of the nut.
Wheel Installation Torque Sequence (Ft. Lbs.)
Wheel Size
Stud Size
1st Stage
2nd Stage
Final Torque
Cone Nut Degree
12" - 440 BC
1/2"-20
20-25
35-40
60-75
60° Cone Nut
12" - 545 BC
1/2"-20
20-25
35-40
60-75
60° Cone Nut
13" - 440 BC
1/2"-20
20-25
35-40
60-75
60° Cone Nut
13" - 545 BC
1/2"-20
20-25
35-40
60-75
60° Cone Nut
14" - 545 BC
1/2"-20
20-25
50-60
100-120
60° Cone Nut
15" - 545 BC
1/2"-20
20-25
50-60
100-120
60° Cone Nut
15" - 655 BC
1/2"-20
20-25
50-60
100-120
60° Cone Nut
16" - 655 BC
1/2"-20
20-25
50-60
100-120
60° Cone Nut
16" - 865 BC
9/16"-18
20-25
50-60
140-170
60° Cone Nut
16.5" - 655 BC
1/2"-20
20-25
50-60
100-120
60° Cone Nut
16.5" - 865 BC
9/16"-18
20-25
50-60
140-170
60° Cone Nut
16.5" x 9.75" 865 BC
5/8"-18
50-60
120-125
175-225
Special Stud Piloted With 90° Cone Nuts
17.5" Hub Pilot 865 BC
5/8"-18
50-60
100-120
190-210
Hub Piloted With Clamp Ring. 90° Cone Nuts &
Greased Threads
17.5" Hub Pilot 865 BC
5/8"-18
50-60
90-200
275-325
Hub Piloted With Flange Nut
17.5" Hub Pilot 865 BC
5/8"-18
50-60
60-110
150-175
Hub Piloted With Swivel Flange Nut
Medium & Heavy Duty Wheel Torque Requirements (Ft. Lbs.)
Description
Part No.
Application
5/8-18 90° Cone Nut
006-109-00
Clamp Ring 033-052-01
190
210 Greased Threads
3/4-10 Hex Nut
006-117-00
Demountable Rim Clamp
210
260
3/4-16 Spherical Nut
006-064-01, 02
006-069-01, 02
Single Wheel
Inner Dual
450
450
500
500
1-1/8 - 16 Spherical Nut
006-070-01, 02
Outer Dual
450
500
5/8 - 18 Non-Swiveling Flange Nut
006-058-00
Wheels
275
325
5/8 - 18 Swiveling Flange Nut
006-209-00
Wheels
150
175
M22-1.5
006-118-00
Swiveling Flange Nut
450
500
Dexter Axle Company
Phone: (574) 295-7888
2900 Industrial Parkway East
www.dexteraxle.com
Torque Min. Ft. Lbs.
Torque Max. Ft. Lbs.
Elkhart, IN 46516
Fax: (574) 295-8666
PRODUCT BULLETIN #409
Page 3 of 3
TORQUE SEQUENCE
1
1
1
3
4
4
3
6
5
4
3
2
2
4 BOLT
5
2
5 BOLT
6 BOLT
1
10
6
8
4
3
5
7
1
8
3
6
5
4
7
2
8 BOLT
2
9
10 BOLT
Chip Durren
Market Manager
Dexter Axle Company
Phone: (574) 295-7888
2900 Industrial Parkway East
www.dexteraxle.com
Elkhart, IN 46516
Fax: (574) 295-8666
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TSB/Document ID: pb409
Replacement Service Bulletin Number:
MFR Communication Date: 2019-10-14
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT
MFR Component System:
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