These are of 2 types as shown in the diagram below.
Shipping container corner post.
Each corner of a container is fitted with a corner post.
These openings serve to lift the containers or to secure them onboard a vessel truck railway wagon or to connect the container to another container.
This is a steel cube fitted with an oval opening on the outside.
The floor consists of 28 mm laminated marine plywood.
Bottom left bottom right and top left and top right.
There are 2 each of 4 different marine shipping container corner castings per set.
Weaknesses here would be improper sections on the flooring not covering 3 cross members in other words a too short a piece of plywood flooring fitted this can lead to sagging and cracking.
The top countries of supplier is china from which the percentage of container corner post supply is 100 respectively.
Sold in sets of 8 container corner castings or individually 200 lbs weight per set 25 lbs.
The eight corner castings of a container or a corresponding ctu have to be particularly strong since they work with the corner posts and the other basic components of the container frame to absorb the forces which lock units or lashings exert on containers when they are stacked on top of one another during handling and during transport.
An illustrative post outlining the anatomy of a shipping container.
Meets the iso standard iso 1161 for container corner castings.