When sourcing wall mount brackets, the most critical factor is the Load Capacity (Weight Rating), which must exceed the intended load by at least 20-25% for safety margins. Material choice is equally vital; Cold-Rolled Steel (SPCC) is standard for indoor use, while Stainless Steel (304 or 316 grade) or Hot-Dip Galvanized Steel is mandatory for outdoor or high-humidity environments to prevent corrosion. Additionally, verify the VESA Compliance for monitor mounts or Gauge Thickness (e.g., 2.0mm to 3.5mm) for heavy-duty shelving brackets to ensure structural integrity.