While the dimensions of the rack components certainly contribute to a rack’s capacity rating, many factors can adversely affect its performance and long-term cost.
The dimensions and gauge of steel are not the only measures of rack quality. When comparing two seemingly identical rack systems, for example 3-inch columns of the same gauge of steel, there can be profound capacity differences that can lead to frequent repair/replace situations.
Rack Structure considerations:
1)How much bracing is designed into the system? Inadequate bracing will affect both capacity and impact resistance.
2)How much weld surface connects your uprights and braces? Frames are only as impact resistant as the welds that hold them.
3)Are upright columns a fully closed tube design or the common open-back configuration? A closed tubular column can withstand far more impact.
Besides,a obvious factor on the total cot is :Quality of steel
Not all steel is alike, and there can be considerable differences in strength. Steel is an alloy of iron and carbon, with the flexibility of having other elements “alloyed” into it. Steel provided by Sunnyrack is carefully regulated and will have mill certification that it’s been manufactured using the correct mix of metals for optimal performance. Imported steel does not carry that same certification and assurance, and can often contain other elements or contaminants that diminish strength.