Answers.Body: <p>Liftarms are 1 stud wide (8 mm) and 7 mm high so they have a 7:8 aspect ratio. (width is the direction parallel to they axis of rotation of the peg holes).</p>
  
  <p>As pictured in the link, the 1x9 liftarm has the hole orientated vertically. So the height is 8mm. The width is 7mm and the length is 9 x 8 mm = 72mm.</p>
  
  <p>Similarly, the 5x7 open center thick has 
  height=8mm
  width=5 x 8mm=40mm
  length = 7 x 8mm= 56mm
  opening width=3x8mm=24mm
  opening length= 5x8mm=40mm</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-28T14:49:43.037Z
Answers.Text: That sounds reasonable. I'm just curios: Where did you find this?
Answers.UserDisplayName: BetaRide
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-28T15:17:05.347Z
Answers.Text: Sorry, should have included a reference:
  Chapter 1 of
  THE UNOFFICIAL LEGO® TECHNIC BUILDER’S GUIDE
  Paweł “Sariel” Kmiec
  
  This is a great technic reference and doubles as a primer on mechanical engineering. Available as a free ebook in pdf form.
Answers.UserDisplayName: mostlyWright
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-28T15:23:24.140Z
Answers.Text: PS For fun, you can also look at CAD representations of the pieces. For example, Google Sketchup, free version. You can download technic pieces into it from the marketplace and measure in the app. Assuming you trust these to be authentic and faithful renderings. You get the same dimensions I quoted above. The stud proportions are actually quite important to keep in mind when designing models.
Answers.UserDisplayName: mostlyWright
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-28T03:25:14.197Z
Answers.LastActivityDate: 2012-12-28T03:25:14.197Z
Answers.UserDisplayName: mostlyWright
Answers.Body: <p><strong>Technic, Liftarm 5 x 7 Open Center Thick</strong></p>
  
  <ul>
  <li>Height = 7.86mm</li>
  <li>Width = 39.80mm</li>
  <li>Length = 55.85mm</li>
  <li>Opening width = 24.08mm</li>
  <li>Opening length = 40.20mm</li>
  </ul>
  
  <p><strong>Technic, Liftarm 1 x 9 Thick</strong> (oriented as shown on Bricklink image):</p>
  
  <ul>
  <li>Height = 7.86mm</li>
  <li>Width = 7.44mm</li>
  <li>Length = 71.36mm</li>
  </ul>
  
  <p>(measured with digital caliper, precision +/-0.05mm)</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-22T19:19:55.153Z
Answers.Text: Thanks for doing the measuring! Since I don't have an approriate tool, that's already helpfull. Actually I was hoping someone does now the exact values as they are weill known (and alredas answered in this forum).
Answers.UserDisplayName: BetaRide
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-05-15T09:52:37.420Z
Answers.Text: Thx for the dimensions, Philo did you measure other parts?
Answers.UserDisplayName: Brookline
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-03-03T16:12:27.213Z
Answers.Text: To increase precision, you can stack multiple beams
Answers.UserDisplayName: bb1950328
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-22T17:10:56.283Z
Answers.LastActivityDate: 2012-12-22T17:10:56.283Z
Answers.UserDisplayName: Philo
Body: <p>I'm looking for the exact dimensions of the studless Technic beams. I found a number of answers for studded beams but there are some more aspects for the studless beams which are not covered.</p>
  
  <p>I'm especially interested in these parts:</p>
  
  <ul>
  <li><a href="http://www.bricklink.com/catalogItem.asp?P=64179">Technic, Liftarm 5 x 7 Open Center Thick</a></li>
  <li><a href="http://www.bricklink.com/catalogItem.asp?P=40490">Technic, Liftarm 1 x 9 Thick</a> (or any other length)</li>
  </ul>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2012-12-22T16:10:21.177Z
Comments.Text: What level of precision do you need?
Comments.UserDisplayName: pcantin
Tags: <technic>
Title: Exact dimensions of studless Technic beams
UserDisplayName: BetaRide
ThreadText: # Exact dimensions of studless Technic beams
  
  (Asked by: username_0 on 2012-12-22)
  
  I'm looking for the exact dimensions of the studless Technic beams. I found a number of answers for studded beams but there are some more aspects for the studless beams which are not covered.
  
  I'm especially interested in these parts:
  
  * [Technic, Liftarm 5 x 7 Open Center Thick](http://www.bricklink.com/catalogItem.asp?P=64179)
  * [Technic, Liftarm 1 x 9 Thick](http://www.bricklink.com/catalogItem.asp?P=40490) (or any other length)
  
  **Tags:** technic
  > **Comments:**
  > **username_1**: What level of precision do you need?  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_2 on 2012-12-28. Score: 6 | Accepted answer
  
  Liftarms are 1 stud wide (8 mm) and 7 mm high so they have a 7:8 aspect ratio. (width is the direction parallel to they axis of rotation of the peg holes).
  
  As pictured in the link, the 1x9 liftarm has the hole orientated vertically. So the height is 8mm. The width is 7mm and the length is 9 x 8 mm = 72mm.
  
  Similarly, the 5x7 open center thick has
  height=8mm
  width=5 x 8mm=40mm
  length = 7 x 8mm= 56mm
  opening width=3x8mm=24mm
  opening length= 5x8mm=40mm
  
  > **Comments:**
  > **username_0**: That sounds reasonable. I'm just curios: Where did you find this?  
  > **username_2**: Sorry, should have included a reference: Chapter 1 of THE UNOFFICIAL LEGO® TECHNIC BUILDER’S GUIDE Paweł “Sariel” Kmiec  This is a great technic reference and doubles as a primer on mechanical engineering. Available as a free ebook in pdf form.  
  > **username_2**: PS For fun, you can also look at CAD representations of the pieces. For example, Google Sketchup, free version. You can download technic pieces into it from the marketplace and measure in the app. Assuming you trust these to be authentic and faithful renderings. You get the same dimensions I quoted above. The stud proportions are actually quite important to keep in mind when designing models.  
  
  ---
  
  ### Answer by username_3 on 2012-12-22. Score: 6
  
  **Technic, Liftarm 5 x 7 Open Center Thick**
  
  * Height = 7.86mm
  * Width = 39.80mm
  * Length = 55.85mm
  * Opening width = 24.08mm
  * Opening length = 40.20mm
  
  **Technic, Liftarm 1 x 9 Thick** (oriented as shown on Bricklink image):
  
  * Height = 7.86mm
  * Width = 7.44mm
  * Length = 71.36mm
  
  (measured with digital caliper, precision +/-0.05mm)
  
  > **Comments:**
  > **username_0**: Thanks for doing the measuring! Since I don't have an approriate tool, that's already helpfull. Actually I was hoping someone does now the exact values as they are weill known (and alredas answered in this forum).  
  > **username_4**: Thx for the dimensions, Philo did you measure other parts?  
  > **username_5**: To increase precision, you can stack multiple beams  
  
  ---
  
  