RcTek : Information & Resources for the Model Car Racer

Fixings & Fasteners - Grub Screws

This section of the RcTek site is devoted to informing the radio controlled model car racer about the various Fixings & Fasteners that are used in remote controlled model cars.

In this article we have information for the model racer about the grub screw type threaded fasteners, which are use extensively in remote controlled cars.

Grub Screws

Grub Screws

Grub screws are usually used on model cars to retain parts such as gears, collets & collars to such as gear shafts, etc.. and the hardened, high tensile steel type is recommended.

Although grub screws are made with both Allen and Slotted type head styles, the Allen type is recommended for model car use due to the weakness of the slotted type.

Grub screws are available with different type tips and these are shown below along with a short description.

Flat Point

Grub Screws

The flat point tip type is the simplest and least expensive type available and is the one that is most commonly use on model cars. For general use it is fine, but the bottom threads can deform when the grub screw is tightened which can make disassembly difficult.

Domed Point

Grub Screws

The domed point tip type is an improvement on the flat point type in that the threads don't deform upon tightening of the grub screw. There is also an increase in point pressure due to the reduced tip contact area.

Cone Point

Grub Screws

The cone point tip type can be used in a couple of different situations. The pointed tip can either located into a machined depression or it can make and indentation into a softer material. It offers better holding power and increased point pressure.

Cup Point

Grub Screws

The cup point tip type is an improvement on the cone point with regard to its ability to create an indentation into the surface it is fastened against.

Knurled Cup Point

Grub Screws

The knurled cup point is an improvement on the cup point as it has serrations on its tip and its flat end. This makes it probably the best type to use on model cars as it is suitable for almost all different applications.

Dog Point

Grub Screws

The dog point type tip is seldom (if ever) used on model cars but is included here for completeness. The tip is normally located into a groove in a shaft and allows the shaft to rotate whilst retaining the part in place.

Measuring Grub Screws

All grub screws are measured and specified using their overall length, regardless of the tip of the screw.

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© 2001, 2009 by Darren Burnhill