Hi,
I want to make a hex and was wondering whether this motor will fit in this frame: 
Motor:
HobbyKing Donkey ST3511-810kv Brushless Motor(Actually a combo)
http://hobbysea.com/products.php?416&cPath=134&sid=0a9373fee1782fe579bcb564fc8f7a8e

Frame:
http://www.hobbyking.com/hobbyking/store/__49726__H550_V3_Glass_Fiber_Hexcopter_Frame_550mm_Integrated_PCB_Version.html.

Thanks in advance.
Regards

No they wont you need to choose a motor which has motor mount separate from motor so that motor can be directly mounted on to the frame.
2826 type motor seems to be perfect fit.

That motor is worth nothing, let alone a multicopter.

the mount bend on first contact with earth. kinda cheap stuff. Magnets rust after few days!.

check motor for this frame , they will fit your frame

http://hobbysea.com/index.php?cPath=23&sid=f838e2d1d12b2eebafb60c2cf55f0bf4