U-Bolts - Forged Top Grade 8

Truckspring.com uses the finest quality SAE Grade 5 and SAE Grade 8 steel, to provide you the best quality u-bolts. All threaded rod manufacturing processes are ISO 9002 and QS-9000 certified, to ensure the best quality products.

We stock Grade 5 Round u-bolts in the following diameters: 1/2", 9/16", and 7/8". We also stock Grade 8 u-bolts in the following diameters: 5/8", 3/4", 7/8", 1", 1-1/8", and 1-1/4".

To Purchase Grade 8 Forged Top U-Bolts

The chart below provides quick reference to the Grade 8 Forged Top u-bolts we have in stock. Each kit contains:

Round U-Bolt Kit
  • 2 u-bolts
  • 4 washers
  • 4 nuts

Once you find the u-bolt that meets your requirements, click on the 'buy' link next to add the u-bolt kit to your cart, and review pricing. On the cart page, specify the number of KITS you would like to purchase, and checkout.

Custom Bent U-Bolts

If you do not find the u-bolt that meets your requirements, send us an email, or give us a call @ 1-800-358-4751. We have a Centermark bender, and can custom bend u-bolts to your specifications. In most cases, custom bent u-bolts ship the same day.

How to Measure a Forged-Top U-Bolt

How to Measure U-bolts

  • Determine the type of bend (Round, Semi-Round, or Square)
  • Measure the diameter of the Rod ("A")
  • Measure the distance between the Legs ("B")
  • Measure the length of the leg ("C")

In the chart below, Part #UB810100 is 5/8" diameter x 2-1/2" wide x 10" long.

Grade 8 Forged Top U-Bolts
      Primary  
Part # Dimension Bend Application Click for Price
UB810100 5/8 X 2-1/2 X 10 Square   Buy
UB812160 3/4 X 2-1/2 X 16 Square   Buy
 
UB86223R 7/8 X 3-1/2 X 23 Round   Buy
UB86224R 7/8 X 3-1/2 X 24 Round   Buy
 
UB814200 7/8 X 3-5/8 X 20 Round Mack Buy
UB814220 7/8 X 3-5/8 X 22 Round Mack Buy
UB814240 7/8 X 3-5/8 X 24 Round Mack Buy
UB814260 7/8 X 3-5/8 X 26 Round Mack Buy
 
UB814130 7/8 X 5 X 13 Round   Buy
 
UB86816R 1 X 3-1/16 X 16 Round IHC/Navistar Buy
UB86817R 1 X 3-1/16 X 17 Round IHC/Navistar Buy
UB86818R 1 X 3-1/16 X 18 Round IHC/Navistar Buy
UB86819R 1 X 3-1/16 X 19 Round IHC/Navistar Buy
UB86820R 1 X 3-1/16 X 20 Round IHC/Navistar Buy
UB86821R 1 X 3-1/16 X 21 Round IHC/Navistar Buy
UB86822R 1 X 3-1/16 X 22 Round IHC/Navistar Buy
UB86823R 1 X 3-1/16 X 23 Round IHC/Navistar Buy
UB86824R 1 X 3-1/16 X 24 Round IHC/Navistar Buy
UB86825R 1 X 3-1/16 X 25 Round IHC/Navistar Buy
 
UBN16095 1 X 6-5/16 X 9-1/2 Round Neway ART Buy
UBN16105 1 X 6-5/16 X 10-1/2 Round Neway ART Buy
UBN16115 1 X 6-5/16 X 11-1/2 Round Neway ART Buy
UBN16125 1 X 6-5/16 X 12-1/2 Round Neway ART Buy
 
UB816155 1 X 3-1/2 X 15-1/2 Semi-Round Peterbilt Air Ride Buy
 
UB816150 1 X 3 X 15 Square   Buy
UB816170 1 X 3 X 17 Square   Buy
 
UB816125 1 X 5 X 12-3/4 Square Fruehauf/Propar Buy
 
UBN16105SFT 1 X 6-5/16 X 10-1/2 Square Neway AR Buy
UBN16115SFT 1 X 6-5/16 X 11-1/2 Square Neway AR Buy
UBN16125SFT 1 X 6-5/16 X 12-1/2 Square Neway AR Buy
 
UB87212SFT 1-1/8 X 5 X 12-1/4 Square Fruehauf/Propar Buy
UB87213SFT 1-1/8 X 5 X 13-1/4 Square Fruehauf/Propar Buy
 
UB87713SRFL 1-1/4 X 5-1/8 X 13 Semi-Round GMC/Autocar Buy
UB87714SRFL 1-1/4 X 5-1/8 X 14 Semi-Round GMC/Autocar Buy
 
UB87710SRFT 1-1/4 X 5-1/8 X 10 Semi-Round Oshkosh/Diamond Reo Buy
UB87712SRFT 1-1/4 X 5-1/8 X 12 Semi-Round Oshkosh/Diamond Reo Buy

Need Custom Bent U-bolts?

Call 1-800-358-4751 for expert advice on U-Bolts. Or send us an email. We're open (Eastern Time Zone):
  • M-F: 7am - Midnight
  • Sat: 8am - 1pm
Secure online ordering is available 24 hours a day, 7 days a week.

About U-Bolts

U-Bolts on many suspensions provide the force necessary to create what is called the center clamp. This provides the permanent tie between not only the spring leaves, but between the spring and spring seat as well. The clamp performs the following functions:
  • Attach the spring firmly to the axle seat
  • Prevent leaf breakage through the center bolt section
  • Prevent center bolt breakage due to shear

U-Bolt Q&A

Q.  If I'm replacing a spring, can I re-use the old u-bolts?

A.  No, you should never re-use u-bolts. A properly installed U-Bolt stretches a little bit under torque. The results of this small amount of stretching and its effects on the U-Bolt threads and deep nut, lower a used U-Bolt's ability to sustain the required clamping torque.


Q.  Is torque important when I tighten u-bolts?

A.  You bet it is. The following are a list of common problems resulting from improperly torqued u-bolts:
  • looseness in seat area
  • excessive wear on chassis components
  • possible spring breakage
  • possible axle slippage and misalignment