C joint
From MediaWiki

The C joint is an accessory mounting system using a rather simple 3mm bar and c-shaped clip. First used in the Revenge of the Fallen/N.E.S.T. Global Alliance series on a few items in 2009, by the time of 2010's gold-packaging Transformers line and Generations, the C joint has seen much more widespread use.
The system has been given the internal nickname "Miyake joint" by TakaraTomy employees, named after its designer Miyake Tomoya[1], who first used it on the Revenge of the Fallen Recon Ironhide toy.
Toys with C joints
Revenge of the Fallen/N.E.S.T. Global Alliance
- Brawn (bars only)
- Brakedown (bars only)
- Recon Ironhide
- Skystalker
Transformers (2010)
- Breacher
- Fallback (bars only)
- Solar Storm Grappel (bars only)
- Hailstorm / Mindset (bars only)
- Hubcap (bars only)
- Special Ops Jazz
- Lugnut (bars only)
- Perceptor (bars only, disabled due to chrome)
- Optimus Prime (bars only)
- Demolitions Rumble
- Sidearm Sideswipe (bars only)
- Sunspot
- Terradive
- Tomahawk
- Turbo Tracks
- Windcharger (bars only)
- Wreck-Gar
Generations
United
Notes
- LEGO has long made use of an identical clip system. As such, LEGO minifigures can cling to 3mm-bar-equipped Transformers.

