What Are Grub Screws and Set Screws?

 


Set screws and grub screws are two different types of screwdrivers. Unlike the standard projecting screw head, set screws lack a threadless shank below the head. Instead, the "head-end" of a set screw is a recessed internal depression. Unlike set screws, a hex or star socket can seat a headless grub screw. Set screws may also be seated in standard slotted drives.

Socket-Head Drive Designs

Socket-head drive designs for a variety of screws have been around for over a century. They are the most common type of drive, with the socket-head being the safest type due to its ability to transmit maximum torque. Both types of drive are compatible with many different types of tools. There are many different tip types for grub screws, including common Cup Points and Torx heads. To suit your specific application, bespoke manufacturing is available.

Socket-head drive designs for a variety of Grub Screws & Set Screw types are available. Set screws, or grub screws, are commonly used for fine adjustment and permanent positioning of parts. Their hex fitting head does not have a threadless shank underneath it, and instead features a recessed internal depression that serves as the "head-end". Socket-head drive designs for grub screws and set screws are designed for standard slotted or hex-head driver sets.



Point Types

Set screws and Grub screw points are similar in appearance. Both types of fasteners are used to clamp or join objects. They are used in a variety of scenarios where a traditional nut and bolt combination would be inconvenient or inadvisable. For example, grub screws are often used as indoor handles to attach them to the spindle. Unlike bolts, which are made with heads, grub screws have no protruding edges.

One of the most common grub screw point types is a cup or cone point. This point features a flat, extended perimeter to guide the screw into the pre-drilled location hole. These types of grub screws are used to secure rotating parts, such as shafts and gears. They are also used to achieve fine adjustments. However, their flat, pointed ends limit their use in automotive applications.



Sizes

There are several different sizes of grub screws and set screw types available for your fixing requirements. Both types are versatile, highly adaptable, and have the benefit of greater corrosion resistance than a bolt or nut. Listed below are some of the most common sizes and types of grub screws and set screws. They are used for a variety of applications, from small repairs to large-scale projects.

A standard set screw size is based on the screw diameter. The diameter should be equal to one-half the shaft diameter. If you are unsure about the screw size, contact the manufacturer for the proper screw data. Common materials for set screws include stainless steel, brass, and alloy steel. Plastic set screws are also widely available. While a set screw's diameter can vary widely, its diameter should match the diameter of the shaft to be effective.

Common Uses

Grubbers, also known as a socket, or set screws, are used to join two objects with a tight torque. Developed over a century ago, grub screws were the first screw to eliminate the need for a screwhead, thus reducing the chance of accidents. They are generally headless and can be seated using an Allen key or a screwdriver with a hexagonal insert bit. Grub screws have several different point types, which are important to know when putting them together.

Often used to attach two pieces of metal, grub screws have a flat point that bites into the surface of the second object when fully screwed in. Set screws can also have a slotted head, recessed drive, hex or square head, or crosshead shape. These are commonly used for fastening screws to metal and plastics. When used in this way, they are incredibly versatile.

Reusability

In addition to being a popular tool in industrial settings, Grub Screws & Set Screws play an important role in the mechanics and engineering fields. They are used to attach door handles and knobs to spindle shafts. To attach a door handle or knob to a spindle, the grub screw thread extends into a square locator recess on the spindle and then is driven into the tapped hole. The screw is fully driven into the hole and the grub head projects through the hole. As a result, the spindle is moved to the proper position on the door handle.

Set screws and grubs are often used together, as they provide a more secure connection. Unlike a traditional bolt, a grub screw doesn't have a projecting head and threads into the surface, rather the head is recessed into the hole. Depending on the application, a grub screw or set screw may be seated into a standard slotted drive or hex socket.

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