The design of grub screws means they’re intended to offer this secure gripping or joining facility without the use of a nut, as opposed to the typical arrangement found with most bolts.

M1.2 x 2mm Slotted Head Flat Point Set / Grub Screws (DIN 551

Grub screws, also known as set screws, are a type of fixing screw that’s most often used to join one component or part securely to another.

It’s non-sparking, and widely used is used for applications requiring some degree of decorative or aesthetic attention thanks to its gold-like appearance. When used the entire screw is encased in the material it is fastening without any exposed screw or bolt heads making them ideal for mechanical systems where metal surfaces rub together or to provide an aesthetic finish.

M2 Screws | Small Screws | Micro Screws | Fastenright Ltd M2 Screws | Small Screws | Micro Screws | Fastenright Ltd

The “M” designation for metric screws indicates the outer diameter of the screw in millimetres, so for an M2 screw, the outer diameter is 2mm. 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.United Kingdom (Deutsch, English) (Nederlands, français, English) (Português) (Български) (English, français) (简体中文, English) (čeština, English) (dansk, English) (eesti keel) (suomi, English) (français, English) (Deutsch, English) (magyar, English) (English) (English) (Italiano,English) (한국어) (latviešu) (lietuvių k. 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. 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.

Grub Screws (DIN 916) - Accu M2 x 3mm Cup Point Set / Grub Screws (DIN 916) - Accu

Hex grub screws provide a very secure, non-slip and deformation-resistant drive socket for seating grub and set screws with high torque forces. One potential downside of flush-set grub screws, however, is that they can be quite difficult to remove once driven with full force to sit flush with or countersunk into the surface of the workpiece, especially if they do become corroded or the drive slot is damaged due to excessive torque going in. 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). They can also be driven with considerably more torque force than traditional screws, as the uniform diameter right the way along the full length of the grub screw shaft means that they don’t begin to split the hole apart as they go in further. Another common usage scenario involving grub screws or set screws is when attaching a pulley hub to a shaft - in this case, the end-point of the set screw pushes firmly against the shaft, possibly with some degree of elastic or plastic deformation of the part(s) at the point of contact, to provide increased grip.

As well as in architectural ironmongery, grub screws are often used in a wide range of industries and sectors to secure all manner of collets, gears and handles to their respective mounting brackets or hardware. In most cases with UK suppliers, you’ll generally see sizes given in the format akin to ‘M8 x 12mm’ or an equivalent variant with different numbers. Because grub screws very often feature a recessed hole or slot at one end for a hex drive, Allen wrench or flat-head screwdriver - as opposed to a traditional head - they can be awkward to get sufficient purchase on for easy removal. These screws can be made from materials such as steel, stainless steel, nylon, brass and ceramic and are available in a wide range of very small sizes. Brass is an alloy of copper and zinc, and the relative proportions of metals in the alloy can vary according to manufacturer specifications and the required mechanical functioning of the screws.