Albany County Fasteners - Nuts, Bolts, Screws, Washers, Rivets & Industrial Supply

What’s the Difference between Bolts and Screws?

What's the Difference between Bolts and Screws

 

When it comes to fasteners, one of the most common questions is, “What’s the difference between bolts and screws?” While bolts and screws may look similar, there are distinct differences that set them apart. In this article, we’ll explore the bolt vs screw and screw vs bolt debate to help you understand when to use each type of fastener.

Bolts Vs. Screws

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Bolts:

A bolt is a type of fastener with external threads and a head designed to be used with a nut. The primary characteristic of a bolt is that it relies on the nut to provide the necessary clamping force to hold assembled parts together securely. Bolts are not intended to create their own mating threads or hold themselves in place. Instead, they must protrude through the materials being fastened to allow the nut to engage the threads. Bolts are frequently used with washers to distribute the clamping force over a larger area.

 

Screws:

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Screws are threaded fasteners that can have a head or be headless (e.g., set screws). Unlike bolts, screws are designed to create their own mating threads in a pre-drilled hole or, in some cases, to create their own hole as they are driven into the material. Screws do not require a nut to fasten securely; they rely on the engagement of their threads with the surrounding material to hold themselves in place. Screws are typically tightened until they are fully seated in the material and are not intended to protrude through to the opposite side, although there are exceptions.

 

Bolt vs Screw and Screw vs Bolt:

When deciding between a bolt vs screw or screw vs bolt, consider the following:

  • Bolts are used when a nut is required to secure the fastener and when access to both sides of the assembly is available.
  • Screws are used when the fastener needs to create its own mating threads and when access to only one side of the assembly is available.
  • Bolts are more often used with washers to distribute the clamping force, while screws are less frequently used with washers, except for finishing purposes.

Terminology Clarification:

At AlbanyCountyFasteners.com, we understand that the terms “bolt” and “screw” are sometimes used interchangeably in industry jargon. To help our customers find the products they need more easily, we may use these terms interchangeably on our website. However, it’s essential to understand the technical differences between bolts and screws when selecting the appropriate fastener for your project.

 

Key Takeaways:

  • Bolts are designed to be used with a nut and require access to both sides of the assembly.
  • Screws create their own mating threads and do not require a nut to fasten securely.
  • While bolts and screws have distinct differences, the terms are sometimes used interchangeably in industry jargon.
  • Albany County Fasteners uses both terms to help customers find the products they need more easily.

Conclusion:


Now that you understand the difference between bolts and screws, as well as the bolt vs screw and screw vs bolt debate, you can make an informed decision when choosing fasteners for your projects. Whether you need bolts, screws, or other fastening solutions, AlbanyCountyFasteners.com has a wide range of high-quality products to meet your needs. Visit our website to explore our extensive inventory and find the perfect fasteners for your next project.

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What Size Drill Bit Do I Use To Drill A Hole For A Carriage Bolt?

 

SHOP DRILL BITS

 

What Size Drill Bit Do I Use To Drill A Hole For A Carriage Bolt?

carriage bolt drill size

A common question we get when discussing carriage bolts is “What size drill bit do I use to drill a hole for a carriage bolt?” The answer is simple. Use the same size drill bit as the diameter of the bolt. If you are using a 1/2″ diameter bolt use a 1/2″ drill bit.

 

Installing A Carriage Bolt

Carriage bolts are very misunderstood and yet very simple to install. Made primarily for wood, carriage bolts have a square shoulder right below the head. This shoulder is designed to catch on wood and be pulled into it (by tightening the nut). Often you will find the domed head of a carriage bolt countersunk into the wood. To learn how to make a countersunk hole carriage bolt in woodyou can check out this video we made: How To Drill A Countersunk Pilot Hole.

SHOP CARRIAGE BOLTS

 

Step One

The first thing to do when installing a carriage bolt is to determine the diameter of your carriage bolt. After you figure out the diameter with a thread gauge or other measuring tool, find a wood drill bit with the same diameter and then get your drill ready.

 

SHOP THREAD GAUGES    SHOP WOOD DRILL BITS 

 

Step Two

Now that you have your drill bit, mark the wood and drill out the hole. Depending on the type of wood drill bit you use to make the hole, the carriage bolt may slide right into the hole or be very tight. If it is very tight grab a hammer and tap the rounded head of the bolt so it slides into the hole. *Pro Tip: Since you already have the hammer out, once the hammering in a carriage boltsquare shoulder gets down to the wood give it a couple solid hits, so the square portion begins to sink into the wood.

SHOP HAMMERS

 

Step Three

Take a washer and nut and fasten them to the carriage bolt against the wood. As you tighten the nut against the washer, it will pull the square shoulder into the wood preventing it from spinning. Once the domed head of the carriage bolt is tight against the wood the carriage bolt is installed.

SHOP WASHERS    SHOP NUTS 

 

Conclusion

Carriage bolts are surprisingly simple to understand and yet many people still struggle with them. Hopefully this post will help you to understand which sizetightening a carriage bolt drill bit you will need and how to install a carriage bolt into wood.

 

 

 

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What is Torque Control?

Torque Control and Related Terms

Torque is the force applied to something to make it spin (rotate) in machinery. Torque in relation to fasteners is the resistance faced when installing a fastener. Torque control then is simply controlling the amount of torque placed on a fastener without damaging it by over-tightening.

Prevailing Torque Measure of a screw or nuts frictional resistance to rotation.
Prevailing “Off” Torque Highest back-off torque on a torque wrench on the first rotation of a screw or nut upon removal.
Installation Torque The initial torque amount used to install a fastener before Pre-load.
Breakaway Torque The minimum torque required to start rotation into a nut (in the case of a bolt) or into a pre-tapped hole (in case of a screw).
Breakloose Torque Minimal torque required to begin the disassembly of a fastener assembly.
Seating Torque The torque required to produce pressure onto the installation material causing compression by the fastener.

Torque Wrenches are one of the easiest ways to ensure proper torque is met. Simply set the wrench’s torque and then when the maximum is reached the clutch will slip. This slip means the wrench stops putting any more torque on the fastener and it has reached its optimal torque.



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How to Install and Remove a Carriage Bolt

Carriage Bolt Install and Removal

The Setup

The first thing we need to do when installing a carriage bolt is to make sure we have the right parts and tools to do so. For this job we will need a:

For our example, we have already pre-drilled the hole into a piece of 2×4 and attached it to a vice. This will act as our installation surface for our carriage bolt.

Understanding A Carriage Bolt

carriage bolt setup

A carriage bolt is a bolt with threading all the way up the shank to a small square shoulder, with a domed head. The square shoulder of a carriage bolt stops it from spinning as it is screwed into the surface of a material. You would not typically use this type of bolt on very hard wood as it may not properly dig into the material, which would cause the bolt to spin in place. Once you seat the bolt through the hole, it is the job of the nut and washer to pull the bolt into the material tightly. Since there is no drive device for the domed head of the bolt, this is the only way to install it.

The Install

The installation process is fairly simple. First, you drill a hole into the wood for the appropriate size (diameter) of the bolt. Next you slide the bolt into the hole (you may need a hammer as the hole should be just big enough for the bolt to go through).

drill the hole

Now that you have the nut through the wood it is time to attach the nut and  the washer. Place the washer on the rear side of the bolt followed by the nut. The washer will help to distribute the force you are about to put onto the nut to pull the bolt into the wood. This will not only protect the wood on the back side but also keep the bolt from digging into it and getting stuck.

tighten nut with washer

As you tighten the nut, the square shoulder on the bolt will be pulled into the wood. Once the underside of the head rests against the wood, the carriage bolt is officially installed.

The Removal

Removing the carriage bolt is a fairly simple process. First, you will want to twist the nut close to the end of the bolt. DO NOT TAKE THE NUT ALL THE WAY OFF THE BOLT, you will need it to help move the bolt along.

prepare to remove and loose nut

Once the nut is backed off to the end of the bolt, hit the nut with a hammer. The force  should start moving the square shoulder out of the wood. As you move the  bolt further out the nut will get closer to the wood. When this happens continue to back out the nut and strike it again. Repeat this process until the bolt is loose enough to take out by hand or the nut can no longer grip the bolt.

push out bolt with hammer

If you find the bolt is stuck but the nut can no longer attach to the bolt, use the nail remover attached to the hammer and use it to pry the bolt out of the hole.

removing process is complete

It’s That Simple

There you go now you know everything you’ll need to know about installing and  removing carriage bolts. As always, Albany County Fasteners stresses the need for protective gear while working with dangerous materials. Remember to ALWAYS wear safety glasses while drilling to protect your eyes and wear protective gloves that fit to keep your hands safe from harm as well.

Full Installation and Removal process you can find on our Youtube channel

Why Do Some Bolts Have Shoulders?

Why Do Some Bolts Have Shoulders?

There are many different types of bolts available for use. From carriage bolts to hex cap screws, many of them can be seen sporting a shoulder (area near the head of the bolt without threading). But why? What does this area do?

Shoulder or Shank?

A shoulder or shank is a term that can be used to describe this unthreaded portion of a bolt. For different types of fasteners the appearance of a shank can mean different things. We made a post a while back about why would screws have a shank; Bolts have a shank for an entirely different reason though.

Bolt Shoulders

Bolt Shoulders exist for two reasons. The first is to create an area on the bolt where sheering is less likely to occur. If a load is pulling sideways against the unthreaded area of a bolt then the bolt will be less likely to snap as the areawhere the pressure is being placed is stronger than the threaded portion. The second reason for a shank is to allow for more versatile uses. This shank can act as an area for something attached to the bolt to be moved around.



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