COMMON SCREW TYPES AT A GLANCE

COMMON SCREW TYPES AT A GLANCE

Silicon Bronze Machine Screws

Silicon Bronze Machine Screws or sometimes called machine bolts are typically smaller than the average threaded screw. Machine screws can range from 3/4 inch (19.05 mm) to larger sizes. Machine screws are usually used to fasten to an existing tapped hole in a metal surface. They often come with a matching nut. The key characteristics of machine screws include their overall size, shape, head type, length, material and thread type.

 

Phillips and flat head are the main types of drive for machine screws. There are many other types of special drives available. These are usually associated with tamperproof screws. These drives include torx – six-point and spanner to name just a few. After the machine screw has been fastened into place, its shape will determine where it lies. For holes that are countersunk, flat head machine screws will be able to lay flush with the surface. Pan and round heads will protrude on a flat surface.

Silicon Bronze Machine Screws should be threaded all the way along their shank. Because the machine screws are often tapped to a particular size or type of thread, it is essential that they are threaded on. Two of the most important characteristics of threads is the outer diameter and pitch of each thread. Machine screws can have either a counter-clockwise or clockwise thread.

 

Sheet Metal Screws

Specially hardened, razor-sharp threads that can cut through materials and make its own internal thread

The shank of sheet metal screws has a sharp tip and threads that enable them to cut through various materials, including metal, wood and plastic. A series of three numbers is used to indicate the size of sheet-metal screws. These numbers refer to the diameter, thread count and length of each fastener. A sheet metal screw with a size 4-32×1-1/2″ has a diameter of 4,32 threads per inch and a length 1-1/2″.

There are two main types of sheet metal screws: self tap screws and Self-drilling screws . These screws are sharp and can cut through metal. But, they must be predrilled. A drill point tip is used to easily cut through metal with self-drilling screw heads.

You can choose from a variety of styles for the head of sheet metal screws. The heads of a pan or round-headed screw will extend to the top of the material when they are installed. When installed, flat and oval countersunk screw heads will be flush with top of material. These screws are available with either a Phillips or flat drive, as well as a combo drive.

Sheet steel screws made of carbon steel are most commonly used and the most cost-effective. These screws can rust or corrosion when exposed to water or chemicals. Therefore, they should only be used indoors. Galvanized and stainless steel screws can resist corrosion but are more expensive than standard steel screws. For a different look, sheet metal screws can be coated in zinc or nickel.

 

Cap Screws

Cap screw has a large head with a cylindrical shaft that has external threads. This provides a positive mechanical stopping device when tightening screws. The head is wider than the threaded section. Cap screws can be inserted directly into a threaded, tapped hole without the use of a nut. When tightened, a cap screw can exert a large amount of clamping power.

The most common styles of cap screws are: Hex head and Socket head. Cap screws are made of stainless steel or carbon steel. The forces required to secure the mechanical connection will determine the type and size of the cap screw that is best suited for the application.

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