A dock board is a heavy-duty portable ramp that bridges the gap between a loading dock and the bed of a truck, trailer, or rail car. Built from steel or reinforced aluminum and equipped with raised side rails, dock boards are designed to support forklifts and other motorized equipment as they move loads between the dock and the vehicle. They’re a standard piece of equipment at warehouses, distribution centers, and manufacturing facilities where freight moves in and out daily.
How Dock Boards Work
The basic concept is simple. A loading dock sits at a fixed height, but the trucks backing up to it vary in bed height. Standard trailers typically sit around 55 inches, while refrigerated and container trailers come in closer to 59 inches. That height difference, combined with the physical gap between the dock edge and the truck bed, creates a space that wheeled equipment can’t safely cross without a bridge.
A dock board spans that gap. One end rests on the dock surface and the other end rests on the truck bed, creating a smooth, load-bearing ramp. The raised edges along both sides, called side rails or curbs, keep forklifts and loaded pallets from rolling off the edge during transit. Those rails also add structural rigidity, allowing the board to handle significantly heavier loads than a flat ramp without bending or breaking.
Dock Boards vs. Dock Plates
The terms get used interchangeably, but they refer to different equipment. A dock plate is a lightweight, flat piece of aluminum with no side rails. It’s meant for hand carts, dollies, and manual pallet jacks. Dock plates are not rated for forklifts, and driving a heavy forklift over one risks bending or breaking it.
A dock board is the heavier, reinforced version built specifically for forklift traffic. The side rails are the most visible difference, but the construction is fundamentally stronger. Dock boards use steel or reinforced aluminum and are rated for much higher weight capacities. If motorized equipment is crossing the bridge, you need a dock board, not a dock plate.
Materials and Types
Dock boards come in several configurations depending on the load requirements and the environment they’ll be used in.
- Aluminum dock boards are built from high-strength aluminum tread plate. They’re lighter than steel, which makes them easier to reposition, and they resist corrosion well. These suit medium-duty applications where the dock board needs to be moved frequently.
- Steel dock boards handle the heaviest loads and highest traffic volumes. They’re the standard choice for busy docks running multiple shifts with large forklifts. Economy steel options exist for moderate-use docks that still need more capacity than aluminum provides.
- Shipping container dock boards are designed for facilities using containers for storage rather than standard trailers. The geometry differs because container openings and heights don’t match a typical trailer dock setup.
- Rail dock boards are built for rail applications like box cars and refrigerated rail cars, where the height differentials and loading conditions differ from truck-based docking.
How to Size a Dock Board
Getting the right dock board means matching three variables: width, length, and weight capacity.
For width, the board should be at least 12 to 18 inches wider than the widest forklift or pallet that will cross it. That margin gives the operator room to drive straight across without clipping the side rails. If forklifts are loading from the end rather than the side, going even wider improves efficiency.
Length depends on the height differential between your dock and the truck bed. You calculate this by subtracting your dock height from the height of the tallest truck that will use it. A larger height differential requires a longer board to keep the ramp angle gentle enough for safe forklift travel. Manufacturer selection charts match specific height differentials to recommended board lengths.
Weight capacity is determined by the forklift that will cross the board, not just the load it carries. You match your forklift’s rated capacity to the corresponding dock board capacity on the manufacturer’s chart. Specialty operations like paper roll clamp handling or multi-shift loading typically require adding 5,000 pounds to the board’s rated capacity. Standard capacity ratings assume single-shift operation at a maximum travel speed of 3 miles per hour.
OSHA Safety Requirements
Federal workplace safety rules under OSHA standard 29 CFR 1910.26 set specific requirements for dock board use. These aren’t suggestions; employers are required to follow them.
Every dock board must be rated to support the maximum intended load. For boards put into service after January 17, 2017, the design must include run-off protection, meaning features that prevent a forklift or other transfer vehicle from driving off the edge of the board. The only exception is when an employer can demonstrate there’s no hazard of a vehicle running off the edge.
Portable dock boards must be anchored in place or secured with equipment that prevents the board from shifting during use. If anchoring isn’t feasible, there must be enough contact between the board and the surfaces it rests on to keep it stable.
The truck or trailer itself also needs to be secured. Wheel chocks, sand shoes, or similar measures must prevent the vehicle from rolling away while workers are on the dock board. A truck that pulls forward even a few inches while a forklift is crossing the board creates an extremely dangerous gap.
Finally, any portable dock board needs handholds or another means of safe handling so workers can position it without injury. Steel dock boards in particular can weigh several hundred pounds, so many facilities use forklifts or lifting chains to move them into place.
When You Need One
If your operation involves forklifts moving between a loading dock and truck beds, a dock board is the appropriate equipment. Facilities that only use hand trucks or manual pallet jacks can get by with the lighter, less expensive dock plate. But the moment powered equipment enters the picture, the combination of higher weight capacity and side-rail protection makes a dock board necessary for both safety compliance and practical durability. Choosing between aluminum and steel comes down to how heavy your loads are, how many hours a day the board sees traffic, and how often it needs to be repositioned.