2 long pin with pin hole Regular (light grey, black, or
red); no friction variant available.
3 long pin with stop bush Regular variant not
available; friction variant exists in a variety of colors.
This pin can be used like a regular 2L friction pin, but its
bush allows it to be pulled out easily. It is often used in
Technic sets to make structural connections that can be
removed with ease.
4 pin with towball Friction variant (black). This pin
usually serves as a mounting point for LEGO links, as
shown in Figure 2-11.
5 axle pin with towball This is a variant of a regular
pin with a towball; available in light grey.
In addition to bricks, the Technic system contains pieces
called beams or liftarms. As shown in Figure 2-12, beams
are like bricks reduced to mere pin holes. They come in many
sizes and shapes, and some beams even include axle holes.