Summary:Threaded Rods - What Are They?A threaded rod, or a...
Threaded Rods - What Are They?A threaded rod, or a studded rod is a long thin rod that's threaded on both sides; the entire rod may be extended along its full length.
They're most often used in tension casting; a threaded rod with a spur on one end is called a bar stock. Threaded rods in strip form are often referred to as a smooth rod. A threaded stud in cast iron form is known as an iron rod. Threaded rods are primarily used to join two pieces of wood together or as a component in an architectural design.The most common sizes of threaded rods are eight and twelve-inch lengths, sometimes thirteen and twenty-two inches.
Most eight and twelve-inch sizes will work well for small to medium-sized casting needs. But if you need something longer, such as twenty-two or thirty-six inches, you might try forty-eight and ninety-two inch pieces. For larger-scale architectural needs, look for a threaded bar of forty-eight to seventy-two inches, or even a hundred and forty-eight and one-half-inch piece.For fastener use, threaded rods with galvanized finishes are a good choice.
You should avoid using brass-based fasteners, such as nuts and screws, unless you're working with a specifically rated fastener. The best bolts to use with a threaded rod are those that contain zinc, though you can't count on them to last forever. Over time, brass-based fasteners will degrade, and zinc will begin to migrate out of the holes, leaving you with an unthreaded rod and a hole in your framing.There are a few other materials that work well for threaded rods, including carbon steel and low carbon stainless steel.
Stainless steel is probably the most common and inexpensive option for residential application. Carbon steel threads are also fairly common, but are more expensive. A193 b7 stainless steel threaded rods are an excellent choice for framing buildings. These rods have excellent tensile strengths, which allow them to be used for years with minimal degradation.The real consideration is how you'll use your threaded rods. You could use them simply as a fastener in a standard situation, or you could use them creatively.
If you are building a house, for instance, the best way to use threaded rods is through the use of corner nuts. Corner nuts are specially made for threaded rods, allowing you to secure your rod to the wall without having to use screws. This prevents your rod from moving sideways, which results in less stress being placed on the framing members.Other applications for threaded rods are roof joists, flooring, and hardware.
A popular application is stainless steel roofing nails, which allow you to nail into the rafters of your house without using traditional nails or screws. Because of the superior tensile strength of stainless steel, you won't have to deal with nail warping and other issues often associated with nails. This means faster roof installation with less labor.