Three materials are common for outdoor AC unit brackets: cold-rolled steel (low cost, high strength — suitable for indoor or dry environments), galvanized steel (zinc-layer rust protection, best cost-performance — the mainstream choice for residential outdoor units), and stainless steel (first choice for coastal, high-humidity environments — longest service life).

Qingyun Lubin Metal stocks all three materials; per-bracket load ranges from 100 to 250kg, all passing salt-spray testing and whole-bracket load tests, with 100% out-of-box inspection.

Buying advice: ordinary residential use — galvanized steel is enough; coastal or chemical-industry areas — 201/304 stainless steel; limited budget with a sheltered installation location — cold-rolled steel powder-coated.