Order U-bolt kits online. Each
U-bolt kit has two U-bolts with nuts and washers. We
also make custom U-bolts (small and large orders).
To order online
kits, click the type of U-bolt that you need. Find the U-bolt
kit based on dimensions. Use our
U-bolt Inquire Form
to find out pricing of U-bolt sizes not listed in our
We also provide discount on large order U-bolt orders (bulk
pricing) --> enter you information in the U-bolt form
to get pricing.
Complete Leaf Spring U
bolt kits that include two U bolts with deep nuts and
hard washers. Click U-bolt type
that you require to go to further detail.
If you don't see a U bolt that meets your
specifications in our catalog, please use
inquire form. We can
also make custom suspension U bolts based on
the dimensions that you need. These custom
axle u-bolts can be shipped anywhere by UPS.
U-bolts 9/16" diameter and less are made from
1541 Grade 5 Material. Ubolts 5/8"
diameter and greater are made from Grade 8 material.
U-bolts have a sufficient amount of rolled
threads on each leg.
We can also make most
suspension u-bolts to your specifications
and ship them out the same day. Please
let us know the dimensions (as shown below),
the type of bend, and the application.
We can give you a price including shipping.
Custom or Quantity U-Bolt Price
LEAF SPRINGS FOR ALL MODEL TRUCKS/
HEAVY DUTY LEAF SPRINGS
A U-bolt serves in four critical related
truck u-bolts provide the force required to clamp the
leaf spring and
related components firmly together. In addition
to the leaf spring, these components
include the top plate, axle seat, axle and bottom
properly installed u-bolt eliminates any flexing
of the leaf spring in the area between
the u bolts. This is particularly critical since
the hole for the centerbolt in each
leaf acts as a stress concentration which would
lead to rapid leaf breakage
if spring flexing was not totally eliminated by
the U bolt clamping force.
• By firmly
clamping the spring to the axle seat the
horizontal forces acting on the centerbolt
are greatly reduced which in turn prevents shearing of the centerbolt.
clamping of the spring by the truck u-bolts provides
the desired spring stiffness and
contributes to maintaining the vehicle ride
height and handling
characteristics as originally specified for the
How to measure a Leaf Spring U-bolts
Regardless of the
bend type, all Leaf Spring U-bolts are measured in the same manner
as shown here. The U-bolt size is given as
(A) x Distance Between Legs (B)
x Leg Length
Additionally the bend type must also be specified;
either round, semi-round
Do not reuse auto or
truck Leaf Spring U bolts
Used U-bolts will have rusted and damaged threads
from the previous installation.
A previously torqued U-bolt will suffer from
distorted threads from the engagement of the
deep nut. Deep nuts should be tightened
once and re-torqued, never loosened
• A used
u bolt may
have suffered from fatigue as well excessive
stress since achieving
accurate torque with commonly used
impact wrenches is very difficult.
Rod/U-bolt Diameter Determination
Socket to Rod Size Chart
13/16" or 7/8"
1 1/16" or 1 1/8"
must be tightened and torqued using a cross
-Tighten #1 then #4 to
partial torque then partial torque #2 and #3
-Using the same sequence, fully torque U-bolt
that have been torqued to a set preload are
recommended to be re-torqued after a short time
to take-up the stretch in the set of the