1. Drywall Screw
   Flat Head Socket Cap Screw
2. Hex Head Cap Screw
   Masonry Screw

Drywall screws are used to connect drywall to wood or metal studs. They create threads as they are drilled into drywall without damaging the material.

1. Square Bolt
   Hex Bolt
2. Lag Bolt
   Track Bolt

Hex bolts are one of the most commonly used standard fasteners. The hex head offers greater strength, ease of assembly and torque application. Ahh, but the real reason they may be so popular to those who manufacture them, is because there is more area for the their logo or name, than a square-headed bolt.

1. One-Way Screw
   Breakaway Head Bolt
2. Square Screw
   Bristol Screw

If you're not going to remove it, or you don't want anyone else to remove it, the one-way screw is perfect for your use. One-way screws are commonly used in commercial restroom fixtures and on vehicle registration plates, anywhere you want to prevent tampering.

1. Phillips Head Screw
   Flat Head Socket Cap Screw
2. Masonry Screw
   Frearson Screw

A Phillips screw head gives you a lot of torque, but the point on the end of the screwdriver can cause it to slip out of the screw head while turning. There are other types of screw heads that allows the screwdriver to have positive torque with little slipping such as square head or mortorq.

1. Sex Bolts
   U-bolt
2. Flange Bolt
   Hanger Bolt

This type of bolt is U-shaped in order to attach to round surfaces, especially pipes. The U-bolt is also available in a square bend. However, the name didn't change for that shape.

1. Wing Nut
   Tee Nut
2. Jam Nut
   Acorn Nut

This is a nut with "wings" for hand tightening. Just like the thumb bolt, or coin-slotted screw, this nut enables one to tighten the bolt without the need of a fastener.

1. U-Bolt
   Shoulder Bolt
2. Track Bolt
   Hex Bolt

Like the ball and socket in your shoulder which allows you to pivot, the shoulder bolt performs a similar task when installed. The shoulder bolt or stripper bolt are used to create a pivot point.

1. Track Bolt
   Square Bolt
2. Bent Bolt
   Plow Bolt

If you've ever hung a hammock, a hanging planter or anything that needs to attach to wood, this is your bolt. Bent bolts are threaded rods where the end can be formed into an eye or a right-angle bend.

1. The Bristol
   Thumbscrew
2. One-way screws
   Masonry Screw

How smart! A screw made for someone who doesn't have a screwdriver. You don't even need a coin, just your thumb. A thumbscrew has either a tall head and ridged or knurled sides, or a key-like flat sided vertical head. It's not found in structural applications because you can't depend on how secure the screws are held.

1. Acorn Nut
   Jam Nut
2. Tee Nut
   Prevailing Torque Lock

Acorn nuts are a high-crown type of cap nut. Interestingly, the Acorn nut is only used for appearance's sake, and does not have any extra durability or strength.

1. Slot Screw
   Masonry Screw
2. Frearson Screw
   Square Screw

The square screw, also known as a Robertson or Scrulox, has a square-shaped socket in the screw head and a square protrusion on the tool. It makes inserting the tool easier, and tends to keep the screw from slipping off.

1. Square Nut
   Jam Nut
2. Tee Nut
   Hex Nut

The six-sided hex nut is a very common nut to use in building and refurbishing and is the typical nut you would purchase. However, if there are special circumstances like holding up in different weather conditions or repairing something that doesn't have enough room to fit a full hex nut, other nuts are available.

1. Lag Bolt
   Track Bolt
2. Elevator Bolt
   Countersunk Bolt

If you're using wood or masonry you'll need a strong, durable bolt. The lag bolt has an expansion anchor to make it stronger and more secure. Lag bolts are square-headed with threaded conical points.

1. J-Bolt
   U-Bolt
2. Shoulder Bolt
   Square Bolt

J-bolts are used for tie downs or as an open-eye bolt. J bolts are used by contractor and homeowner alike. Used for bigger projects such as building a garage, a new foundation or attaching an new wall to concrete, it provides an additional attachment point once fastened.

1. Track Bolt
   Square Bolt
2. Plow Bolt
   Flanged Bolt

Washers have traditionally been used to protect the joint surface from damage during the tightening process and to distribute the load under the bolt head and nut. Flanged bolts have large heads and using them often eliminates the need for separate washers.

1. Nylon Insert Lock Nut
   Tee Nut
2. Wing Nut
   Jam Nut

This nut comes with a nylon insert to prevent backing off. The plastic insert is placed at the end of the nut, with an inner diameter slightly smaller than the diameter of the screw. Nylon Insert Lock nuts are less damaging to mating threads, but have lower heat limitations.

1. Masonry Screw
   Frearson Screw
2. Hex Head Cap Screw
   Lag Screw

Your project is a bit bigger if you're working with cement and brick. So you'll need masonry screws to connect walls to concrete floors, and attaching hardware to block or brick.

1. Counter-Sunk Screw
   Frearson Screw
2. Masonry Screw
   Lag Screw

Hidden to make the final piece more attractive, the countersunk screw sits flush with the surface. They can be discreetly covered by a screw cap or piece of wood. It also allows objects can rest upon it stably.

1. Carriage Bolt
   Track Bolt
2. Square Bolt
   Plow Bolt

You know when you've tightened a carriage bolt, the ribs or flats on the shank prevent it from turning anymore. The bolts also sport round heads to be aesthetically pleasing.

1. Slot Screw
   Flat Head Socket Cap Screw
2. Lag Screw
   Hex Head Cap Screw

Just as familiar as the Phillips screw, the slot screw is driven by a "common blade" or flat-bladed screwdriver. It was the first type of screw drive to be developed and is used in restoration of old and antique furniture, vehicles and equipment.

1. Track Bolt
   Round Bolt
2. Breakaway Head Bolt
   Elevator Bolt

Building prison door locks, automobile ignition switches, or hoisting a street sign? These are items that you don't want people to easily remove. The breakaway head is a high-security fastener where the head breaks off during installation, or immediately after, leaving a smooth, tamper-free surface.

1. Lag Screw
   Hex Head Cap Screw
2. Flat Head Socket Cap Screw
   Frearson Screw

The Frearson screw is also known as the Reed and Prince screw. Although similar to a Phillips, the Frearson has a sharp tip and larger angle in the V shape which makes the driver or bit able to fit all screw sizes. You can torque this screw at a higher pressure than a Phillips screw without stripping it.

1. Cap Nut
   Square Nut
2. Tee Nut
   Jam Nut

A nut designed to be driven into wood to create a threaded hole is called a tee nut. These nuts require a pre-drilled hole to use and can be serrated to provide a better grip.

1. Slot Screw
   Brass Screw
2. Masonry Screw
   Square Screw

Looking to attach a decorative hinge? You'll need brass screws. Make sure you have the right size screwdriver for these screws. They are made of a malleable material, so a large screwdriver will strip out the heads.

1. Lag Screw
   Coin-Slot Screw
2. Frearson Screw
   Double-Slot Screw

Coin-slot screws can be unscrewed with a coin. This screw is used on items where a person most likely doesn't have a screwdriver. This screw is used for such things as compartments that contain batteries in a toy, camera or other items.

1. Track Bolt
   Countersunk Bolt
2. Elevator Bolt
   Square Bolt

Think of how fast a train runs on a track and the vibrations that track receives. The track bolts need to stay secure and not twist or loosen with the intense vibrations. Track bolts are designed specifically for use in railroad tracks. Some bolts have an elliptical head to prevent rotation.

1. Cap Nut
   Square Nut
2. Jam Nut
   Heavy Hex

This will get you out of a jam! If the space where you're screwing in the nut won't fit a regular hex nut, a jam nut should fit because of it's reduced height.

1. Flat Head Socket Cap Screw
   Sheet Metal Screw
2. Flat Head Phillips Machine Screw
   Hex Head Cap Screw

Sheet metal screws are made out of carbon steel and are the most common and most economical screws. However, you may want to pay more for galvanized or stainless steel screws that are designed to resist rust and corrosion.

1. Cap Nut
   Square Nut
2. Castle Nut
   Flange

Square nuts are ideal to use in blind location because people can tighten and loosen a square-shaped fastener without having it in sight, as long as a sturdy grip can be obtained.

1. Coupling Nut
   Castle Nut
2. K-Lock Nut
   Square Nut

The one thing both professionals and DYI enthusiasts know is there is no "perfect" project. Things never fit precisely. That's why coupling nuts are important. They connect pieces of threaded rod or other male threaded fasteners to extend or create a better fit.

1. Aircraft Bolt
   Countersunk Bolt
2. Elevator Bolt
   Square Bolt

Just look at a skyscraper and you'll realize how important elevator bolts and their correct installation is to all office workers and visitors alike. That's why elevator bolts are designed to have relatively large diameters and flat, square necks. The larger bearing area of the head lets them work in soft materials while the square neck prevents rotation.

1. Castle Nut
   K-Lock Nut
2. Square Nut
   Cap Nut

K-Lock or Kep is a nut with an attached free-spinning external tooth lockwasher. The advantage of using a K-Lock is that it is already a combination of an external tooth lock washer and nut, so you don't need (or can lose/drop) as many parts.

1. Flange Nut
   Cap Nut
2. Castle Nut
   Wing Nut

The flange is serrated to allow for a better grip on the surface of the joint. Serrated nuts work well for over-sized or irregularly shaped holes, since the flange covers any discrepancies and serrations cover the entire bearing surface.

1. 2-Way Reversible Lock Nut
   Prevailing Torque Lock Nut
2. K-Lock Nut
   Castle Nut

A lock nut that can be installed either side up, which makes it faster and easier to use. It is often used in high-temperature applications.

1. Track Bolt
   Countersunk Bolt
2. Round Bolt
   Plow Bolt

This won't surprise you, plow bolts were mainly used for building and fixing plows and are now used on road graders, tractors, scoop shovels and other types of farm equipment. Plow bolts are used when the surface needs to be smooth. They sometimes include a key that prevents rotation.

1. Castle Nut
   K-Lock Nut
2. Slotted
   Prevailing Torque Lock Nut

A non-reversible lock nut is used for high-temperature applications. However, they are not recommended when the nut must travel down long spans of threaded shanks. The gradual wearing away of metal tends to loosen the grip of these lock nuts.

1. Slotted Nut
   Castle Nut
2. K-Lock Nut
   Coupling Nut

Drill a hole through the threaded section of a bolt and place a cotter pin through it to prevent the nut from rotating.The nut you'll use is the slotted nut that has six large slots, 60 degrees apart, in the top center of each flat side.

1. Sheet Metal Screw
   Flat Head Socket Cap Screw
2. Wood Screw
   Lag Screw

Wood screws are specifically designed for connecting wood to wood. If you are constructing something that will be outside year-round, used in salt water, fresh water, or wet conditions, be sure to order a silicon bronze wood screw that is 96% copper and around 2% to 3% silicon.