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Grub Screws.

Grub Screws

What are Grub Screws?

Grub screws, known for their headless design, are a specialized type of fastener crucial in precision engineering. Typically, you insert these screws into a tapped hole and secure them with an internal drive. Their lack of a protruding head differentiates them from bolts, enabling them to sit flush or below the surface of the material. This feature makes grub screws ideal for applications where a smooth surface finish is vital and where space constraints do not allow for the protrusion of a traditional screw head.

How Grub Screws Work.

Grub screws are used to secure an object within or against another object, effectively without being seen or causing interference. They are often employed in situations where a minimalistic or smooth finish is essential, such as in machinery, instruments and consumer electronics. For example, they can be used to secure a gear onto a shaft in a gearbox or to adjust the tension in a guitar string by being fitted into the bridge. Their headless design ensures a seamless fit, making them indispensable in both aesthetic and functional applications.

Materials of Grub Screws.

Available in an abundance of materials for any task, our range includes A2 and A4 Stainless Steel for corrosion resistance, Hardened Steel for strength, PEEK for chemical resistance, Polycarbonate for electrical insulation and Nylon for reduced friction. These materials offer specific benefits like enhanced durability, resistance to environmental factors, or insulation properties, making them suitable for various industrial and consumer applications.

Sizes, Drive Types & Tips.

Accu offers a huge array of grub screw sizes and types, ranging from the smallest thread size of M1.2 (1.2mm) to the largest M20 (20mm) and lengths from 1.5mm to 120mm. Drive types include Socket, Torx and Slotted. Whether you need small grub screws for delicate applications or larger sizes for robust assemblies, there’s a variant to suit every requirement.

As for grub screw types, usually, we're discussing the type of tip which will be clamping down on the joining part i.e. a shaft. Accu's range encompasses flat, cone, ball & spring, cup, nylon tip, brass tip, dog point and knurled which offer enough variance between the range to cover any and all engineering applications. To learn even more, we have an article that explains "What are grub screws?" and goes into the details fo each tip type.

Additional finishes like AccuBlack chemical blackening offer a matte black finish that reduces reflections and allows for seamless integration for a blacked-out look. AccuLock thread locking patches offer enhanced resistance to loosening which is exceptionally important for this family of screws.


Q: What are grub screws used for?.

A: Grub screws are used for securing objects without a protruding screw head, ideal for applications requiring a smooth finish or in confined spaces. Common uses include machinery assembly, musical instruments and electronics.

Q: Are grub screws one size?.

A: No, grub screws come in various sizes, from tiny M1.2 (1.2mm) to larger M20 (20mm) thread sizes and lengths from 1.5mm to 120mm, catering to different application needs. They also come in different drive types too meaning you can have an allen key grub screw or a slotted one.

Q: What are the disadvantages of grub screws?.

A: Grub screws can be difficult to remove once installed, especially if over-tightened or if thread-locking patches are used. They also require precise alignment to ensure effective fastening. One minuscule movement can mean the difference between a tight hold on a shaft to no holding power at all.

Q: What's the difference between a grub screw and a set screw?.

A: While the terms are often used interchangeably when it comes to the differences between a grub screw vs set screw, grub screws typically refer to headless screws, while set screws historically refer to a fully threaded bolt.

Q: Which grub screw is best?.

A: Choosing the best grub screw largely depends on the tip type required for your specific application. Flat tips are best for ensuring maximum contact on flat surfaces, while cone tips are ideal for centring in indented areas. Ball & spring tips offer flexibility for irregular surfaces, and cup tips work well with rounded shafts. For delicate or finished surfaces, nylon and brass tips prevent damage. Dog point tips are excellent for fixed positioning and alignment. Selecting the right tip type is crucial for optimal performance in your specific use case.

Bespoke Grub Screws Manufacture.

High precision, bespoke manufacture of Grub Screws to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.

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