# Fixture for round rod to square or rectangular tube **URL:** \ **Category:** General\ **Created:** [April 14, 2025, 8:00pm UTC](https://fireball.discourse.group/t/fixture-for-round-rod-to-square-or-rectangular-tube/3521 "2025-04-14T20:00:49Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![AlikB](https://avatars.discourse-cdn.com/v4/letter/a/8c91f0/32.png) [@AlikB](https://fireball.discourse.group/u/AlikB)\ **Post date:** [April 14, 2025, 8:00pm UTC](https://fireball.discourse.group/t/fixture-for-round-rod-to-square-or-rectangular-tube/3521/1 "2025-04-14T20:00:49Z")
I send a message on Instagram today about a fixture set up for a round rod or tube 1” or larger into square tube . I’m including a photo . ![IMG_7341](https://canada1.discourse-cdn.com/flex036/uploads/fireball/original/2X/5/529bd64673d59e7200dbea40fb0cf20ef11d20cc.jpeg) ---
**Author:** ![Fireball\_Jason](https://yyz2.discourse-cdn.com/flex036/user_avatar/fireball.discourse.group/fireball_jason/32/52_2.png) [@Fireball\_Jason](https://fireball.discourse.group/u/Fireball_Jason)\ **Post date:** [April 14, 2025, 8:56pm UTC](https://fireball.discourse.group/t/fixture-for-round-rod-to-square-or-rectangular-tube/3521/2 "2025-04-14T20:56:18Z")
Here’s the post. ![IMG_4375](https://canada1.discourse-cdn.com/flex036/uploads/fireball/original/2X/1/15d036bfbd8e061c0af593091e0642032f9e7fdb.jpeg) > **[Fireball™Tool on Instagram: "How to set up a piece of tube vertical into the...](https://www.instagram.com/reel/DIcVILMzQXz/?igsh=MXJ6dXJscWp2MjI3aw==)** > > 15 likes, 0 comments - fireballtool on April 14, 2025: "How to set up a piece of tube vertical into the center of the material. #fireballtool #fixturetable #fixture #welding #metalworking #howtoweld #weldingtable". I would probably use the 3 axis square if the pin needed to sit flush on the back side. > **[3-Axis Square](https://fireballtool.com/products/3-axis-square?_pos=1&_psq=3%2Baxis&_ss=e&_v=1.0&variant=41406076911660)** > > Three axis square is a unique solution to clamping in 3 axis at once. Use the inside or outside faces. 4 machined faces on both the inside and outside of the square. No limit on inside face, large 4” height limit on outside face, Ductile cast iron... ---
**Author:** ![AlikB](https://avatars.discourse-cdn.com/v4/letter/a/8c91f0/32.png) [@AlikB](https://fireball.discourse.group/u/AlikB)\ **Post date:** [April 14, 2025, 9:49pm UTC](https://fireball.discourse.group/t/fixture-for-round-rod-to-square-or-rectangular-tube/3521/3 "2025-04-14T21:49:36Z")
The rod would be in the center of the square or rectangle tube . ---
**Author:** ![Dahoe](https://yyz2.discourse-cdn.com/flex036/user_avatar/fireball.discourse.group/dahoe/32/2836_2.png) [@Dahoe](https://fireball.discourse.group/u/Dahoe)\ **Post date:** [April 18, 2025, 3:37pm UTC](https://fireball.discourse.group/t/fixture-for-round-rod-to-square-or-rectangular-tube/3521/4 "2025-04-18T15:37:44Z")
I would fixture the tube sideways on the table and use the v blocks from Fireball tooling kit to support the round tube. Bring the rectangular tube to proper elevation with the magnetic shims. ---
**Author:** ![Fireball\_Jason](https://yyz2.discourse-cdn.com/flex036/user_avatar/fireball.discourse.group/fireball_jason/32/52_2.png) [@Fireball\_Jason](https://fireball.discourse.group/u/Fireball_Jason)\ **Post date:** [April 18, 2025, 6:00pm UTC](https://fireball.discourse.group/t/fixture-for-round-rod-to-square-or-rectangular-tube/3521/5 "2025-04-18T18:00:14Z")
The problem with that setup is you can’t fully weld it out in the fixture. It would be a tack and remove the part setup. It’s beneficial to limit the number of touches on the part. It speeds the process up. ---
**Author:** ![SHFab](https://avatars.discourse-cdn.com/v4/letter/s/b77776/32.png) [@SHFab](https://fireball.discourse.group/u/SHFab)\ **Post date:** [May 24, 2025, 2:36pm UTC](https://fireball.discourse.group/t/fixture-for-round-rod-to-square-or-rectangular-tube/3521/6 "2025-05-24T14:36:11Z")
I would use the mega square. This gives you 2 reference points on the OD of the round rod. Put it on top of a couple fence blocks to get some extra height.