I build things. I need mechanical parts from time to time, and I always have trouble finding the parts I need because I don't have a vocabulary from the mechanical engineering world - I hope to acquire the language by living in the forum for a while (and thinks in advance to anyone who can help). This week I am looking for a hinge. The purpose of the hinge is to allow a stiff piece to flex without breaking. I drew a picture of the hinge in sketchup: http://i.imgur.com/WRTq4uv.png Googling around, I found this piece: http://www.hardwaresource.com/hinge...Heavy+Duty+Gate+Hinges/4"+Bolt-On+Pivot+Hinge which seems to fit the bill. But it's too costly because it supports weight limits I don't need (I only need about 50 lbs. per hinge) Can anyone suggest what this kind of hinge is called? I need to buy one for a relatively cheap price - does anyone have a good source for mechanical pieces I can buy off the internet?