1. Understanding Rack Pricing Differences
Unlike standardized products, pallet racking systems are structural storage equipment. Their pricing depends on several technical factors, including upright specifications, beam configuration, material thickness, and structural design.
Although steel prices are relatively transparent in the market, different suppliers may adopt different design approaches when preparing a quotation. As a result, two situations may occur:
Underspecified materials – Some suppliers may choose smaller material sizes to reduce the quoted price, which may affect structural capacity if the rack operates close to its design limits.
Overspecified designs – In other cases, racks may be designed with larger sections than necessary, which increases material usage and overall project cost.
For this reason, it is helpful to review the technical specifications of the rack components, rather than comparing quotations based only on total price.
A typical pallet racking system includes three main components: upright frames, beams, and decking. In U.S. warehouses, wire mesh decks are commonly used.
This article focuses on upright frames, which play a key role in determining rack load capacity.
2. Upright Load Capacity Selection
Upright frames are assembled components consisting of two columns, horizontal and diagonal braces, and base plates. Although they are usually quoted as a complete unit, they are typically shipped in separate parts and assembled during installation.
Several factors influence upright load capacity.
Column Dimensions
Column size is one of the main structural parameters. Common column sizes in teardrop pallet racks include 3″ × 3″ columns, while larger profiles such as 100 × 67 mm columns may be used for higher load requirements.
Larger column sections generally provide greater stiffness and may support higher loads when properly engineered.
Material Thickness
Column thickness also affects structural performance. Typical specifications include:
14 gauge (about 1.9 mm)
13 gauge (about 2.3 mm)
12 gauge (about 2.5 mm)
Thicker materials may increase structural strength, although actual capacity depends on the overall rack design and configuration.
Steel Grade
Steel grade can also influence load performance. For example, Q355B steel typically has higher yield strength than Q235B, which may contribute to higher load capacity when used in an appropriate design.
Bracing Design
The number and arrangement of braces within the upright frame also affect stability. Adjustments to brace quantity or layout may improve frame rigidity.
Actual load capacity should always be verified through structural calculation based on the specific warehouse layout and operational requirements.
3. Additional Factors Affecting Load Capacity
Besides upright specifications, several installation factors may influence rack performance.
First Beam Height
The height of the first beam from the floor affects the effective unsupported length of the upright column. A higher first beam position may reduce the overall load capacity.
Base Plate Design
Upright frames may use assembled base plates or welded base plates.
Assembled bases offer greater flexibility and reduce shipping volume, while welded bases may simplify installation. Although base plates generally have limited impact on load capacity, larger base plates may improve stability in certain installations.
4. RMI Standards
For warehouse projects in the United States, pallet racking systems are commonly designed in accordance with Rack Manufacturers Institute (RMI) standards, which provide guidance for structural design and safety requirements.
Understanding whether a racking system aligns with applicable standards can help support compliance during installation.
Jracking’s U.S. standard teardrop pallet racks are manufactured in accordance with RMI standards, supporting customers in meeting relevant project requirements.
Conclusion
Upright frames are one of the key structural components in a pallet racking system. Specifications such as column size, material thickness, steel grade, and bracing configuration directly influence rack load capacity.
When evaluating rack quotations, reviewing the technical specifications behind the design can provide a clearer understanding of whether the proposed configuration matches the warehouse requirements.
In the next article, we will discuss how beam selection and decking options further affect pallet rack load capacity.