How do you attach carriage bolts?

Asked By: Laurencia Itts | Last Updated: 7th January, 2020
Category: sports climbing
4.1/5 (355 Views . 41 Votes)
Slide the threaded end of the carriage bolt into the drilled hole. Push the head of the bolt against the surface of the material. Tap the head of the carriage bolt to seat the bolt to the material.

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People also ask, how do carriage bolts work?

Carriage Bolts: Carriage bolts are used mainly in making furniture. They have a round head with a square collar and are tightened into place with a nut and wrench. The collar fits into a prebored hole or twists into the wood, preventing the bolt from turning as the nut is tightened.

One may also ask, do you use washers with carriage bolts? No washer needed. The whole idea or the square part is to hold the bolt in place so you can tighten up the nut without the bolt turning. Carriage bolts can be a PITA on for deck applications.

Accordingly, where can you use carriage bolts?

Carriage bolts are extensively used for security fixings, such as locks and hinges, where the bolt must only be removable from one side. The smooth domed head and square nut below prevent the carriage bolt from being unlocked from the insecure side.

How long should a carriage bolt be?

Typically, carriage bolt sizes range from #10 to 3/4" in diameter while lengths span from about 1/2" to 20"—only larger sizes are available in long lengths. Measure length from under the head to the threaded end of the bolt.

18 Related Question Answers Found

What is the difference between a lag bolt and a carriage bolt?

The carriage bolt is more of a bolt than its lag counterpart. The carriage bolt is a straight cylinder with a flat edge. The top has a small square neck that resists turning when it is fastened into place. The lag bolt, on the other hand, has a point at the end and wide threads for use in wood construction.

What are the different types of bolts?

Types of bolts
  • 3.1 Anchor bolt.
  • 3.2 Carriage bolt.
  • 3.3 Elevator bolt.
  • 3.4 Flange bolt.
  • 3.5 Hanger bolt.
  • 3.6 Hexagon bolt/Tap bolt.
  • 3.7 Lag bolt.
  • 3.8 Machine bolt.

How do you get a carriage bolt out?

How to Remove a Carriage Bolt
  1. Equip a socket wrench with the appropriate sized socket.
  2. Push on the head of the carriage bolt with your thumb and twist the nut counterclockwise with the socket wrench.
  3. Strike the threaded end of the carriage bolt with a hammer to push the bolt head out of the hole.

Why do you need washers on bolts?

The primary purpose of most washers is to evenly distribute the load of the threaded fastener with which they are used. Threaded fasteners stress the material in which they are driven. Driving a screw into wood, for example, may cause the wood to crack around the surface.

Why is it called a carriage bolt?


There actually are simple Carriage bolts were designed to attach sheet metal to wood. The square base under the head allows the bolt to be tightened from one side without a second person holding the head from turning.

How do you remove a nut from a spinning carriage bolt?

Use the socket wrench on the nut and begin turning the nut while holding the bolt still with a large flat head screwdriver. If the nut still won't budge, spray more WD-40 on the nut and wait a few minutes. Than use a hammer to tap on the nut and bolt to try to break some of the rust.

Do carriage bolts have shear strength?

Carriage bolts are designed to be tightened from the nut side of the assembly. Grade 5 carriage bolts are made from carbon steel and have a tensile strength of 120,000psi, and have a proof load strength of 85,000psi. They have a tensile strength of 150,000 psi and a shear strength of 90,000 psi.

What happens if you dont use a washer?

Most notably, washers protect the surface from damage during installation. They distribute the pressure and prevent the fastener from moving or corroding. Skipping on washers can dramatically reduce the lifespan of how your product is put together. Ultimately, that leads to disaster for the product itself.

What order do lock washers go on?

Ideally the lock washer goes into the threaded fastener first followed by the flat washer. This way the lock washer adds tension to the fastener assembly. It creates pressure on the bolt or nut (depending on where it is used) to prevent the assembly from loosening when it is exposed to vibration.

What do washers do for screws?


Washer, machine component that is used in conjunction with a screw fastener such as a bolt and nut and that usually serves either to keep the screw from loosening or to distribute the load from the nut or bolt head over a larger area. For load distribution, thin flat rings of soft steel are usual.

How many washers are in a bolt?

Bolts come in lengths of 1/8" steps. If you need to use more than 2 washers, consider going to the next size bolt. 3 washers is acceptable practice. If it takes more than 3, then you should consider a shorter fastener or make a custom spacer.

Which direction does a lock nut go on?

Locking Nuts
Place the lock nut against the threaded end of the bolt, just as you would place an ordinary nut. Make sure that if the nut has a raised center portion this faces out; the flat surface of the locking nut should sit flush against the work surface once tightened.