Views:2 Author:Site Editor Publish Time: 2018-04-17 Origin:Site
The machine screws series is one of the most important categories in the whole fastener product line. In life, we often see machine screws on various occasions, such as on the machine, in the wardrobe, on the board, and so on. In fact, we are no strangers to machine screws. Today we are going to have a deep understanding of machine screws.
What are machine screws?
Machine screws are one type of screw; they're used to hold parts together in all types of machines such as electronics, engines and huge industrial manufacturing equipment. Occasionally, they're also called stove bolts. Typically, they're threaded through preexisting, tapped holes -- as opposed to creating the hole as you screw them in. Still, some machine screws have tapping ability to cut and thread a hole as they're inserted. Machine screws come in coarse thread, which means they have 24 threads per inch, and in fine thread, which means they have 32 threads per inch. Machine screws come with different types of heads.
Machine screws are uniformly threaded screws of ¼ inch nominal diameter or less those are designed to be threaded into uniformly threaded nuts or threaded holes in the parts they are intended to fasten. Machine screws are available in a wide array of configurations, materials, driver head types and sizes. As their name implies, machine screws are used to fasten various components together in machines, tools, appliances, electronic devices and vehicles of every description. They are available in virtually every material including steel, stainless steel, brass and even nylon.
Different head types of machine screws
Machine screws are available in a wide assortment of driver head types, including standard slotted, Phillips head, hex socket head for use with Allen wrenches, Torx six-pointed star, square-drive socket head and security heads, which are easily driven in but very difficult to remove.
The most common types of machine screw head shapes are pan head, flat head, round head, oval head, truss head and hex head. While round heads are probably used most often, flat heads are particularly useful when the screw needs to be flush with the surface it's screwed into. Oval head machine screws are very similar to flat head screws, but they're a bit rounded on top. Pan heads stick out above the surface, as do truss heads. Truss heads have a lower profile, though, and they have a large surface area. Most of the various head types are available with either slotted or Philips screwdriver compatibility, and some come with a combination head that is compatible with both. On the fillister and cheese head machine screws, the slot is deeper than others so you can apply more power when you drive them in. Meanwhile, tamper-resistant machine screws make it difficult for unauthorized people to get into whatever you've screwed shut.
Difference between machine screws and bolts
Although machine screws are generally considered to be smaller than bolts, machine screws also tend to be designated as such if the primary tightening of the fastened joint is accomplished by turning the head of the screw. With a bolt, the primary tightening procedure might be accomplished by turning the nut holding the bolt through a hole.
Stainless steel machine screw sizes
While the size of a machine screw is usually relatively small, there can still be a vast amount of variations between size, shape and length, mostly determined by their intended purpose and how strong they need to be. Custom-made screws may also be manufactured for specific machines that do not even have to follow any ISO standards. Machine screws can be made of any of a variety of metals or plastics.
Machine screws may have their threads formed by die cutting, where some material is actually cut out of the grooves forming the thread, or by rolling or roll forming where the thread is rolled into the screw by precise rolling dies under very high pressure where no material is removed.