ULTRA ROD® Two-Piece
Torque Rods
SUBJECT: Selection Guide and Welding
Instructions
LIT NO: 59310-002
DATE: February 2009
REVISION: D

SELECTION GUIDE

CURRENT END

OLD END

HOLE DIA.

MOUNTING CNTRS

66610-000H
66766-000H
66767-000H

46610-000
56766-000
56767-000

5⁄8"

43⁄8"
43⁄8"
43⁄8"

CURRENT END

66620-000H
66769-000H
66630-000H

OLD END

7⁄8"

¾"

TAPER

11⁄8"

46620-000
56769-000
46630-000

2" X
17⁄8" X 1¼"
3" X 1¼"

CURRENT END

OLD END

HOLE DIA.

LENGTH

66640-000H

46640-000

¾"

511⁄16"

CURRENT END

OLD END

HOLE DIA.

LENGTH

66610-000H

46610-000

5⁄8"

43⁄8"

CURRENT END

OLD END

HOLE DIA.

66650-000H

46650-000

11⁄8"

CURRENT END

OLD END

HOLE DIA.

LENGTH

MOUNTING CNTRS

66661-000H
66768-000H
67047-000H
67048-000H
66660-000H
67046-000H

46661-000
56768-000
57047-000
57048-000
46660-000
57046-000

5⁄8"

¾"
¾"
7⁄8"
5⁄8"
¾"

27"
27"
27"
27"
35"
35"

43⁄8"
511⁄16"
43⁄8"
43⁄8"
43⁄8"
43⁄8"

CURRENT END

OLD END

TAPER

LENGTH

66691-000H
66690-000H

46691-000
46690-000

17⁄8" X 1¼"
17⁄8" X 1¼"

27"
35"

CURRENT END

OLD END

TAPER

LENGTH

66671-000H
66670-000H

46671-000
46670-000

2" X 11⁄8"
2" X 11⁄8"

27"
35"

CURRENT END

OLD END

TAPER

LENGTH

66681-000H
66680-000H

46681-000
46680-000

3" X 1¼"
3" X 1¼"

27"
35"

CURRENT END

OLD END

TAPER

LENGTH

66671-000H
66670-000H
66681-000H
66680-000H

46671-000
46670-000
46681-000
46680-000

2" X 11⁄8"
2" X 11⁄8"
3" X 1¼"
3" X 1¼"

27"
35"
27"
35"

CURRENT END

OLD END

HOLE DIA.

LENGTH

66701-000H
66700-000H

46701-000
46700-000

11⁄8"
11⁄8"

27"
35"

ULTRA ROD® Two-Piece Torque Rods
ULTRA ROD TWO-PIECE TORQUE RODS
The Hendrickson ULTRA ROD® can service most trucks up to 52,000 pound capacity.
ULTRA RODs are designed for up to 27 inch centers for most applications and 35 inch for
widespread tandems.

HOW TO MEASURE AND ASSEMBLE NEW TWO-PIECE ULTRA RODS
To ensure proper measurement for torque rod replacement, check for the following:
■

If the torque rod being replaced IS an ULTRA ROD, measure center of end hub to center
of end hub of the old torque rod. Make the new torque rod the same length.

■

If the old torque rod IS NOT an ULTRA ROD, it is IMPORTANT to verify how the torque rod
is mounted and then measure as shown in Figures 1, 2, and 3.

FIGURE 1

FIGURE 2

Outside Mount:
Measure center to center of old
torque rod. Make the new torque rod
the same length.

FIGURE 3

Taper Pin To Straddle Pin Mount:
Measure center to center of old
torque rod and add 1⁄16" to make new
torque rod.

Inside To Inside Mount:
Measure from the center of old
torque rod and add 1⁄8" to make new
torque rod.

PRE-ASSEMBLY METAL PREPARATION
FIGURE 4

1. Select the appropriate end type for the
cross-member end, frame rail and axle
end of the existing torque rod.
2. Assemble male spacer bar into the base
of the female sleeve until it bottoms in
the female sleeve. Measure for excess,
see Figure 4.
3. Remove excess of male spacer bar using abrasive cutting, sawing, or machining methods. End face of spacer bar should be square. DO NOT flame or arc cut.
4. Remove all grease, oil, rust or oxides from the metal surfaces to be welded by grinding,
filing, or power brushing.

2

59310-002

ULTRA ROD® Two-Piece Torque Rods
WELDING ASSEMBLY
THE WELDING PROCEDURE DESCRIBED MUST BE PERFORMED BY AN ASME OR AWS QUALIFIED
WELDING OPERATOR. AN EFFECTIVE WELD BETWEEN SPACER BAR AND TUBULAR END IS CRITICAL
TO SAFE OPERATION OF THESE PARTS. HENDRICKSON TRUCK SUSPENSION SYSTEMS SHALL NOT BE
RESPONSIBLE FOR WELDING AND FABRICATION PERFORMED BY THE PURCHASER OR USER OF THIS
PRODUCT.

NOTE

For correct and easy assembly, match scribed line on spacer with sleeve arrow and weld, as
shown in Figure 5.
1. Assemble male spacer bar into the base of the female sleeve until it bottoms in the
female sleeve. Check for correct length, see detail on front page of this publication.
2. Rotate male end until scribed line is positioned with arrow on sleeve end. Hold in position for fillet weld, see Figure 5.
FIGURE 5

3. Complete assembly by welding a minimum ¼" convex fillet weld. This weld must obtain
full root penetration with equal legs sufficient to provide metallurgical fusion between
weld and base metal. DO NOT undercut or overlap.
■

For maximum security, welded assembly should be NDT inspected with dye penetrant, fluorescent penetrant or magnetic particle techniques. Any 1⁄16" or larger defect
must be repaired and reinspected.

WELDING PROCESS
TYPE: Preferred: GMAW (Gas Metal Arc Welding), commonly referred to as MIG welding.
Alternate: SMAW (Shielded Metal Arc Welding), commonly referred to as stick, arc or
coated electrode.
CURRENT: DC reverse polarity.
SHIELDING GAS: (GMAW process only) 100% CO2 or 75% Argon - 25% CO2 (C25) at 30 CFH
flow.
FILLER METAL:
NOTE

GMAW - AWS #ER70S-6, SMAW - (Coated electrode), AWS #E6010 or
E7018.

No pre-heating or post-heating of metal is required. However, SMAW (coated electrodes)
should be stored in a warming oven to minimize moisture absorption.
COMPONENT POSITION: All components are to be positioned so welding can be performed
in the #1F (Flat Roller Fillet) position only.

BASE METAL: Male Spacer Bar and Female Sleeve: SAE 1030
See Hendrickson Selection Guide, Lit. No. 45745-148 for more information regarding one and
two-piece torque rods and replacement bushings.
Refer any questions regarding this publication to Hendrickson Tech Services.
Contact information:
1.866.755.5968 (toll-free U.S. and Canada)
1.630.910.2800 (outside U.S. and Canada)
e-mail techservices@hendrickson-intl.com
Visit www.hendrickson-intl.com for Hendrickson product information.
59310-002

3

www.hendrickson-intl.com

Truck Commercial Vehicle Systems
800 South Frontage Road
Woodridge, IL 60517-4904 USA

59310-002 Rev D 02-09

1.866.755.5968 (Toll-free U.S. and Canada)
1.630.910.2800 (Outside U.S. and Canada)
Fax 1.630.910.2899

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.
© 2009 Hendrickson USA, L.L.C. (U.S. Rights) Hendrickson International Corporation (Rights Outside U.S.) All Rights Reserved

Printed in United States of America