Quick Answer

WHAT SIZE ARE stock U-bolts?

Standard U-Bolt Chart

SIZE Dia. (D) Ins. Length (L)
5/16 x 3/4 5/16″ 2″
5/16 x 1 5/16″ 2 7/16″
5/16 x 1 1/4 5/16″ 2 3/4″
5/16 x 1 1/2 5/16″ 3″

How do I calculate my U-bolt length?

The U-bolt size is given as Diameter (A) x Distance Between Legs (B) x Leg Length (C). Additionally the bend type must also be specified
either round, semi-round or square.

What happens if you reuse U-bolts?

Reason 2: Used U-bolts don’t tighten the same as new U-bolts. The next issue with reusing U-bolts has to do with the threads themselves. When being tightened, the threads are deformed under the torque. Each time the U-bolt is tightened the threads are cut and grooved by the nut as the nut is tightened around them.

Can you reuse U-bolts on trucks?

We get a variety of reactions when we advise our customers that reusing U-bolts is never a good idea. There are some very specific reasons why we stress this point so much, trying to sell you something you don’t need is not one of them. U-bolts are a torque to yield bolt.

How are trailer U bolts measured?

The length (L) is measured from end of bolt to inside of the bend, while the width (C) is measured between the legs. Some companies will show the length to the bottom or centerline of the bend instead of the top of the bend. The width is sometimes detailed as center of one leg to center of the other leg.

How much weight can u bolts hold?

How Much Weight Can An Eye Bolt Hold?

Shank Diameter (in) Weight Capacity (lbs)
7/8 7,200
1 10,000
1-1/4 15,000
1-1/2 22,000

What is the U-bolt formula?

The U-bolt size is given as Diameter(A) x Distance(B) x Leg Length(C). Additionally the bend type must also be given to avoid problems in specifications of semi-round bend shapes.

How is U-bolt weight calculated?

The weight is calculated by multiplying the volume of the product by its density. The density of the material varies from material to material. The density of the 304 grade steel is 7.85 grams per centimeter cube, that of super duplex grades is 7.8 and of Nickel 200 alloy is 8.89.

How do you specify AU bolts?

In order to specify a u-bolt for pipes, you must provide the diameter of the pipe, the material, the tangent length, and either the load or thickness of the u-bolt rod.

What is the torque specs for U-bolts?

Recommended U-Bolt Torque for Cold-Formed U-Bolts

Size Material Grade Max. Torque Ft. Lbs. Unplated
1/2 – 20 5 70
9/16 – 18 5 100
5/8 – 18 8 177
3/4 – 16 8 313

Can loose U-bolts cause vibration?

By definition, an under-tightened bolt is already loose and the joint does not have enough clamp force to hold the individual sections together. This can lead to sideways slippage between sections, placing unwanted shear stress on the bolt that could eventually cause it to break. Vibration.

Can you over tighten leaf spring bolts?

Tightening the shackle bolts too much will squeeze the shackle straps against the leaf springs and the whole suspension system will bind and cause problems. The best thing to do when tightening down shackle bolts is to use lock nuts and tighten them until they are snug and then backed off 1/4 turn.

How do you tell when leaf springs are worn out?

Look out for these tell tale signs that you need to replace your leaf springs:

  1. Squeaky sounds while your truck is in motion.
  2. Slouching on one side.
  3. Sagging in the back.
  4. Diminished handling.
  5. Trouble hauling and towing loads.
  6. Suspension bottoming out.
  7. Cracks on leaves.

Should you replace U-bolts on leaf springs?

Expert Reply: I would not recommend reusing your existing u-bolts because the nuts are designed to mis-align the threads as they are tightened down to prevent the u-bolts from coming loose. You should choose the u-bolt kit that will fit the diameter of your axle.

Can you reuse bolts that have been heated?

If fasteners have been exposed to extreme heat or show any signs of corrosion, they should not be reused. Previous modifications made to fasteners with paint, lubrication, or other treatments also make them unsuitable for a second application.

How do you torque leaf spring bolts?

A 1/2 inch diameter bolts should be torqued between 45 ft/lbs and 70 ft/lbs. A 9/16 inch diameter bolt should be torqued between 65 ft/lbs and 95 ft/lbs and a 5/8 inch diameter bolt should be torqued between 100 ft/lbs and 120 ft/lbs.

How much weight can a 1/2 inch bolt hold?

Proof Load

Nom Bolt Size (in) Grade
2 5
7/16 5850 9050
1/2 7800 12100
9/16 10000 15500

What is the safe working load for a 1 eye hook?

Shoulder Eye Bolts

Shank Diameter Working Load Limit In Linepull (lbs.) Working Load Limit Angle Less Than 45° (lbs.)
7/8 10600 2650
1 13300 3325
1-1/4 21000 5250
1-1/2 24000 6000

How much weight can a 1/2 U-Bolt hold?

How much weight can a 1/2 U-Bolt hold?

a b breaking strength
3/8″ 5/16″ 4600 lbs.
1/2″ 3/8″ 8000 lbs.
9/16″ 1/2″ 12500 lbs.

How tight should you tighten U-bolts?

A 1/2 inch diameter bolts should be torqued between 45 ft/lbs and 70 ft/lbs. A 9/16 inch diameter bolt should be torqued between 65 ft/lbs and 95 ft/lbs and a 5/8 inch diameter bolt should be torqued between 100 ft/lbs and 120 ft/lbs. I have attached two FAQ articles on trailer suspension for you to check out.

How heavy is a bolt?

weigh-in between 350 to 399 grains, standard weight crossbow bolts range from 400 to 459 grains, and heavyweight crossbow bolts weigh-in at a hefty 460 grains and above. These bolt weights include the weight of a standard 100-grain field point in addition to the weight of the finished bolt itself.

How much weight can an M8 bolt take?

How Much Weight Can An M8 Bolt Hold?

Size Grade 8.8 Grade 10.9
M8 2,120kg 3,040kg
M10 3,370kg 4,810kg
M12 4,890kg 7,000kg
M16 9,100kg 13,000kg

How much does a keg of bolts weigh?


What are square U-bolts used for?

Square U Bolts are designed to fix an item to a box section structure or trunking, or used for clamping square or rectangular items. Typically, they find themselves in use within the suspension of metal channels and duct work – but can also be embedded in concrete as anchor bolts or used to secure heavy equipment.

What is au bolt clamp?

U-bolts are traditionally used to clamp pipes into place. Pipes are tubes and engineers who design pipe systems are wholly concentrated on the inside of the tube – because from there they can determine how much fluid or gas can flow through the pipe. Makes sense – for them.

What is au bolt on a truck?

The U-bolt is a U-shaped bolt with a nut on each end. In automotive situations, they are primarily used to hold up the rear suspension leaf springs. The springs are threaded through the bolt, and the bolts are screwed down on the axle.