Screws are fasteners which are used to hold to objects or materials together and are integral parts of wooden items, machines, buildings, electrical appliances, etc. A screw is made of metal which is usually stainless or galvanised steel. The top part of the screw which is visible even after it is embedded into the material is called the head. The end point of the screw is sharp to drill inside the material. The cylindrical body of the screw is called shaft and is characterised by threading in a helical pattern. Best best quality screws online (cap screw, drywall screws, pan head screw, csk screw, lag screw, bolt screw, brass screws, black screws, stainless steel screws) with best offers. The portion just below the head is called shank which is smooth in some types of screws.
The screws can be classified on the basis of some factors. They have been discussed here.
The screws can be divided into countersunk screw and non-countersunk screw on the basis of the design of the screw heads. In a countersink screw, there is an angular shape beneath screw head which requires you to drill a hole with the correct head angle so that the screw is housed perfectly. In a non-countersink screw, the head does not have an angle and the screw head is present outside the surface. Hence, there is no need to make a pre-drill hole to house the screw head.
Countersink screw head- The following types of screw heads are countersink screw heads.
Non-countersink screw head- These are the various types of non-countersink screw heads.
Screw drive is the design of a screw which allows it to be turned and installed using a screwdriver or Allen wrench. The screw drive determines the manner in which the screw attaches with the surface.
Grub screw which is also known as set screw does not have a head and is fully threaded. Even if a grub screw has a head, it will be fully threaded with no smooth shank between the head and the shaft.
Ball screw functions by converting rotational motion to linear motion. A ball screw has a ball nut and a threaded shaft. Ball bearings are present between the nut and the shaft which provides a rolling motion to the nut over the threaded shaft.
Lead screw also converts rotational motion to linear motion. However, a lead screw is different from ball screw due to the fact that the nut slides over the threaded shaft instead of rolling.
When you need to buy screw, you must ensure that the screws you purchase must match the project. For simple projects which do not require drills, screws with simple heads and simple drives such as Philips are suitable. For heavy-duty materials, screw heads with multiple grooves and points are suitable. You can access all types of screw online due to presence of many online stores. The screw price depends upon its design, material, size, screw head and brand. Prices of specialty screws will be more as compared to conventional screws. For example, ball screw price is more as compared to a simple screw. The type of head is also an important determinant of the screw. For example, star screw price is more as compared to a slotted or Phillips screw. Machine screws are heavy duty screws. Thus, the screw machine price is more as compared to wood screw price. But the price of a machine screw is lesser as compared to self drilling screw price. This is because self drilling screw has a drill shaped point which can cut through metal and does not require a pilot hole. Material of the screw is also an important factor. For example, steel screw price is more as compared to aluminium screw price because steel is a heavy duty metal.
You can compare the screw price list for various types of screws on different online stores to get the best price.
|Hettich Handle Fixing Screw- Retail Packing - M4 x 20 (Pack of 1000)||Rs. 1,255|
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