# Pylon design and Material selection

**URL:** <https://opensourceleg.discourse.group/t/pylon-design-and-material-selection/213>\
**Category:** General\
**Created:** [May 14, 2026, 12:30pm UTC](https://opensourceleg.discourse.group/t/pylon-design-and-material-selection/213 "2026-05-14T12:30:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![seasea](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@seasea](https://opensourceleg.discourse.group/u/seasea)\
**Post date:** [May 14, 2026, 12:30pm UTC](https://opensourceleg.discourse.group/t/pylon-design-and-material-selection/213/1 "2026-05-14T12:30:05Z")

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Hi OSL Community,

I am trying to better understand the “pylon” design in this project.

Could you explain how the pylon is atteched to the adjacent components (such as the socket, actuator, or foot structure) ? I would also like to ask which materials are recommended for the pylon to achieve a good balance between mechanical strength, stiffness, and lightweight performance. Thank you for your time. 🙂

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**Author:** ![elissacimino](https://avatars.discourse-cdn.com/v4/letter/e/e9bcb4/32.png) [@elissacimino](https://opensourceleg.discourse.group/u/elissacimino)\
**Post date:** [May 15, 2026, 6:28pm UTC](https://opensourceleg.discourse.group/t/pylon-design-and-material-selection/213/2 "2026-05-15T18:28:00Z")

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Hello!

The knee and ankle modules are mounted to the pylon via tube clamp adapters. These attachments connect the prosthetic pyramid (_[p0002\_pyramid](https://cad.onshape.com/documents/29f3e974441e78dfcd79ed3b/w/102a12c1d3dd5671a650b7a6/e/28363691885a5745d336ff67?renderMode=0&uiState=6a063695aaa33af09d09fea6)_ on the OnShape document) to the pylon. They are not currently shown in the OSL OnShape document, but look similar to [this example](https://www.bulldogtools.com/prosthetic/stainless-steel-40-mm-tube-clamp-adapter_p_6733.html?osCsid=7c1728c647278b7390809d0e7e910e74). These are outsourced components that we do not design ourselves, and we typically source them from suppliers such as [Bulldog Tools](https://www.bulldogtools.com/prosthetic/). Hope this helps!