Shoulder screws, also known as shoulder bolts, have a non-continuous thread from tip to head, leaving a smooth part of the shank at the base of the head. They are used for rotation or locking screws and can be made with different metals and heads. Square shoulders resist rotation, making them useful for permanent fixtures.
There are many different types of screws and fasteners, each of which has a specific purpose. Shoulder screws have a non-continuous thread from tip to head, so there is a smooth part of the shank at the base of the head. These screws are used for a variety of applications, including those that involve rotation or require some type of locking screw. They are also often called “shoulder bolts”.
The difference between these screws and other types is in the extent to which the threads go – the ridges that spiral up the shank of the screw and pull it into the hole as it turns. On many screws, the thread runs from the tip to the head. On a shoulder screw, however, the thread stops some distance from the head, leaving a smooth-sided round or square shank between the thread and the head. This area is usually slightly larger than the threaded portion of the screw.
Because of their design, these screws are capable of serving many specialized purposes. For example, they are often used in automotive or mechanical applications because the unthreaded shoulder makes a good fastener for pulleys, linkages and other moving parts. Allows for rotation or other movement, such as a pivot link.
Shoulder screws can also be made with a square shoulder, as in a carriage bolt. Square shoulders are useful because they resist rotation, allowing them to act as a strong permanent fixture. For example, the carriage bolt is used in wood because the square portion of the shank resists movement, allowing it to lock into place in the wood. This bolt has a smooth, round head with no slots for a screwdriver or wrench; the bolt is secured with a nut which is screwed onto the threaded end.
Different types of metal, including alloy steel and stainless steel, can be used to make shoulder screws. They can also have different types of heads, such as slotted, Phillips, square or hex. The length and diameter of the shoulder are often as important as the size of the threaded portion, as the smooth portion of the shaft may perform the most important function of the bolt.
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