Bullet hinges
Bullet hinges are a two part steel hinge system that are usually used on heavy duty, high security gates, and they are usually welded in place, although there may be some bolt on or screw on options available.
There are various types and sizes of bullet hinges that can be used, and various designs that may increase security or ease of use.Bullet hinges also come in different metals. Some bullet hinges also have a built in greasing system, so you can lubricate them in place.