Here is a list of all the components of a Modern Fence Technologies stainless steel hinge that are not stainless steel:

Engineered material bearing.

 That's it, all other parts are 100% stainless steel.

Here is a list of all the components of a Modern Fence Technologies mild steel hinge that are not stainless steel:

Gate bracket, post bracket, engineered material bearing.

 All other parts are 100% stainless steel.

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