Answers.Body: <p><a href="https://i.sstatic.net/DcON4.jpg" rel="noreferrer"><img src="https://i.sstatic.net/DcON4.jpg" alt="enter image description here"></a></p>
  
  <p>The answer is <strong>studs</strong>. Note that there are more pieces with the same ability. </p>
  
  <p><a href="https://i.sstatic.net/8jGQB.jpg" rel="noreferrer"><img src="https://i.sstatic.net/8jGQB.jpg" alt="enter image description here"></a></p>
  
  <p><em>Orientation of the bushing <strong>does</strong> matter when you run a rotating axle through a technic plate. Have the round side of the bushing pointing towards the studs. Otherwise the axle might lock up.</em> </p>
  
  <hr>
  
  <p>Here's an example from set 852 where this technique is used to attach the helicopter's rotor and propeller to an axle. </p>
  
  <p><a href="https://i.sstatic.net/PgKd7.jpg" rel="noreferrer"><img src="https://i.sstatic.net/PgKd7.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://i.sstatic.net/gMqlv.jpg" rel="noreferrer"><img src="https://i.sstatic.net/gMqlv.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://i.sstatic.net/S5TsD.jpg" rel="noreferrer"><img src="https://i.sstatic.net/S5TsD.jpg" alt="enter image description here"></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-09-19T10:40:51.457Z
Answers.Text: I would also add that initially, when Technic was released there were no studless beams. This required for new system to adapt to existing building approach - building studs up. In the end it required new (Technic) plates and adapted bushes to interlock assembly vertically. Later parts (like connectors in the photo) just followed new system.
Answers.UserDisplayName: Alex
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-09-19T10:47:43.413Z
Answers.Text: @Alex Good point! I've added an example...
Answers.UserDisplayName: Uli
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-09-19T21:37:33.783Z
Answers.Text: Makes perfect sense, thanks.
Answers.UserDisplayName: Raystafarian
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-09-19T08:24:52.370Z
Answers.LastActivityDate: 2019-09-19T11:49:48.630Z
Answers.LastEditDate: 2019-09-19T11:49:48.630Z
Answers.UserDisplayName: Uli
Answers.Body: <p>The wavy side allows you to wedge the bush between 4 studs on a plate or brick.</p>
  
  <p>In my experience, placing the bush differently orientated never affects the build.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-09-19T08:20:35.810Z
Answers.LastActivityDate: 2019-09-19T08:20:35.810Z
Answers.UserDisplayName: Michael Verschaeve
Body: <p>Exhibit <s>A</s> 3713:</p>
  
  <p><a href="https://i.sstatic.net/uFx7O.png" rel="noreferrer"><img src="https://i.sstatic.net/uFx7O.png" alt="enter image description here"></a></p>
  
  <p>The near side is smooth on the circumference, but the far side has a wavy pattern. In Lego directions, the photos usually show the "orientation" of the bushing, but if I put it on the incorrect way, will it affect the build?</p>
  
Tags: <technic>
Title: Why do technic bushings have a flat side and a wavy side?
UserDisplayName: Raystafarian
ThreadText: # Why do technic bushings have a flat side and a wavy side?
  
  (Asked by: username_0 on 2019-09-19)
  
  Exhibit ~~A~~ 3713:
  
  [![enter image description here](https://i.sstatic.net/uFx7O.png)](https://i.sstatic.net/uFx7O.png)
  
  The near side is smooth on the circumference, but the far side has a wavy pattern. In Lego directions, the photos usually show the "orientation" of the bushing, but if I put it on the incorrect way, will it affect the build?
  
  **Tags:** technic
  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_1 on 2019-09-19. Score: 12 | Accepted answer
  
  [![enter image description here](https://i.sstatic.net/DcON4.jpg)](https://i.sstatic.net/DcON4.jpg)
  
  The answer is **studs**. Note that there are more pieces with the same ability.
  
  [![enter image description here](https://i.sstatic.net/8jGQB.jpg)](https://i.sstatic.net/8jGQB.jpg)
  
  *Orientation of the bushing **does** matter when you run a rotating axle through a technic plate. Have the round side of the bushing pointing towards the studs. Otherwise the axle might lock up.*
  
  ---
  
  Here's an example from set 852 where this technique is used to attach the helicopter's rotor and propeller to an axle.
  
  [![enter image description here](https://i.sstatic.net/PgKd7.jpg)](https://i.sstatic.net/PgKd7.jpg)
  
  [![enter image description here](https://i.sstatic.net/gMqlv.jpg)](https://i.sstatic.net/gMqlv.jpg)
  
  [![enter image description here](https://i.sstatic.net/S5TsD.jpg)](https://i.sstatic.net/S5TsD.jpg)
  
  > **Comments:**
  > **username_2**: I would also add that initially, when Technic was released there were no studless beams. This required for new system to adapt to existing building approach - building studs up. In the end it required new (Technic) plates and adapted bushes to interlock assembly vertically. Later parts (like connectors in the photo) just followed new system.  
  > **username_1**: @username_2 Good point! I've added an example...  
  > **username_0**: Makes perfect sense, thanks.  
  
  ---
  
  ### Answer by username_3 on 2019-09-19. Score: 3
  
  The wavy side allows you to wedge the bush between 4 studs on a plate or brick.
  
  In my experience, placing the bush differently orientated never affects the build.
  
  
  ---
  
  