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What Are the Different Types of Screws?

Various nuts, bolts and screws.
Hex screws can be turned with wrenches.
Lag screws, which have coarse threading and a hexagonal head, can be used to secure wooden planks and other materials.
Pieces of sheet metal might be secured to each other or to another surface with sheet metal screws.
Allen wrenches - can be used with hex screws.
The head of a Phillips screwdriver looks like a plus sign when viewed head on.
A hex socket screw.
Article Details
  • Originally Written By: L. S. Wynn
  • Revised By: A. Joseph
  • Edited By: L. S. Wynn
  • Last Modified Date: 31 October 2014
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Screws are amazingly versatile and powerful fasteners. The basic concept is a threaded cylinder that is used for holding all sorts of things together, including wood, plastic and metal. Different types of screws have been developed to maximize efficacy for particular applications. The various types of screws can be categorized according to driving methods, head shape, type of threads and the material and finish used to make the screw.

Driving Methods

Head Shape

Thread Varieties

In addition to all the varieties described above, screws can be made out of various materials, including steel, brass, aluminum and nylon. Screws also can have various finishes such as zinc plating, black oxide or non-stick coating. A screw that will be exposed to the elements might be galvanized to prevent rusting. Screws also come in a seemingly endless variety of diameters and lengths.

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anon924878
Post 20

What type of screw thread has an equilateral triangle thread form?

anon321132
Post 19

Set screws are also used with nuts.

woodscrews
Post 18

A visual representation of the article.

@wanderer, the difference between bolts and screws are that both are externally threaded fasteners, but a bolt is intended to be tightened or released by a nut, whilst a screw is intended to be inserted into holes in assembled parts being tightened by torquing the head. Then you have bolts which are screws, and vice versa, for example, machine screws!

muahmed
Post 17

Could any one suggest that where we put hard drive screws, rack Screws, printer screws, camera screws, and general mounting screws in the below mentioned screw types, assuming that all of above mentioned screws are made up of steel.

anon90588
Post 16

For threaded rods, go to Rockler or Hartville tool and buy the threading tool, make your own out of dowels. There are threaded rods made from wood which was pressure-saturated with some kind of plastic. They are expensive!

anon84581
Post 15

To start out, look in the Machinery Handbook or Standard Handbook for Mechanical Engineers. Then go to McMaster-Carr and the other industrial hardware vendors. Cheers, Ghost54

anon74037
Post 11

Tapcon screws are designed for concrete or cement, a pilot hole needs to be drilled first, then the screw can be installed.

anon72693
Post 10

There's also screws made to screw into plastic. Looking into screw point the screw profile is not round, often like a rounded corner equilateral triangle.

anon50777
Post 8

Trim screws (or trim head screws) are missing from your list.

anon45016
Post 6

How can I tell one screw from another?

anon27498
Post 5

I am looking for threaded rods that are made out of wood and are used to put shelves together with wooden spindles that have threaded ends.

where can I find these.

thanks, naz

wanderer
Post 4

What are the main differences between BOLT and SCREW? Can these name be used interchange?

Here are what I know:

Bolt to be used with nut

Screw to be used alone (self tap)

Why do we call LAG BOLT but not LAG SCREW or do we?

elsewhen
Post 2

There are also lag screws (or lag bolts) which are usually heavy-duty fasteners that have a hex head and are tightened with a nut.

Drywall screws are specially designed to be installed with a drill with a drive-bit; you can hang drywall very quickly and easily with these specialized screws.

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