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Set screws also known as grub screws are a special type of screw used to secure moving or sliding parts securely into position. Set screws are completely threaded along the entire length and have no head. They are widely used in a range of sectors and industries. Here at Cromwell, we offer a wide selection of set screws from leading brands Qualfast, Bondhus and workshop. Set screws are considered a type of bolt, despite several key differences. They are designed to securely join and grip components together without the need for a nut. They do not have a head like standard screws and bolts, which allows them to sit flush and hidden within the workpiece with no protruding parts.
A grub screw, also known as a set screw is used for securing sliding or moving components in place. Grubs screws have threaded inserts instead of tapering screw grooves. The screw is passed through a threaded hole in the outer object and then tightened against the inner object to prevent it from moving relative to the outer object. Grub screws are commonly used to secure a pulley or a gear to a shaft or for attaching a handle or cam to a spindle. You can learn more in our comprehensive grub screws guide and our complete set screws guide.
cone point tip grub screws, which are ideal for exerting additional force when joining items made from softer materials, or to fit into an existing depression in the piece being mated to The most obvious point of distinction between grub screws and other types of standard screws and bolts is that true grub screws tend not to feature a protruding head. Instead, they’re usually threaded right to the top, and are the same diameter all the way along their length, meaning that the grub screw can be fully driven into its hole to sit flush with (or even countersunk into, depending on the application) the workpiece. If it won’t budge and needs to be drilled out, start by taking an awl or centre punch and using it with a hammer to make a small indentation in the visible end of the grub screw - this will help reduce the risk of the drill bit from slipping or wandering while you drill through the metal Set screws often do feature a head - very likely a hex fitting - but without a threadless section immediately below it (again, this is different to the length of unthreaded shank you’d typically find on a standard bolt). Because they often feature no protruding screw head in the traditional sense, true grub screws tend to be driven by means of a sunken internal recess at what is still generally referred to as the ‘head end’.
Grub screws can often prove especially useful in situations where a standard nut and bolt would impede the optimal functioning of an object or component(s), or else would not achieve the clean aesthetic the installer is aiming for on the visible/external faces of an item. They’re almost always found being used in mechanical systems where two or more metal surfaces rub or press directly together, and where there isn’t room to fit a bolt or other type of protruding head between the two flush surfaces without limiting proper functionality or movement of the part(s).The main difference is set screws are fully threaded. This allows the entire length of the screw to be fully inserted into the object, unlike standard screw that have a screw head and tightened by a bolt. When buying grub screws or set screws from most manufacturers and suppliers to the UK market, you'll usually find up to six different variants of grub screw shapes on offer. These include: cup point grub screws, which offer much the same function as cone point varieties but can be driven still further to provide even more torque and gripping force Oval point - This style causes minimal surface damage to the held part and due to its shape allows for slight adjustments can be made without loosening the screw. However, the basic steps to removing a grub screw will be largely similar to those required for removing any other type of threaded fastener:
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