The horizontal distance from the vertical face of the forks to the center of gravity of the load, typically 24 inches for a uniformly loaded 48 inch deep pallet.
Detailed Definition
Forklift capacity is rated at a stated load center, commonly 24 inches for many counterbalanced trucks in North America. A uniform load 48 inches deep along the forks, such as a 48 x 40 pallet carried along its 48 inch side, has a 24 inch load center; a uniform load 40 inches deep has a 20 inch load center. If the load's center of gravity sits farther out than the rated load center, safe capacity is lower. Uneven loads, long items and attachments all move it forward. See forklift.
How load center changes capacity
A counterbalanced forklift works like a seesaw with the front wheels as the pivot. The load's weight multiplied by its distance from the pivot must be balanced by the truck and its counterweight. Moving the load center outward increases that turning effect, so a truck rated for a given weight at 24 inches can safely carry less at 30 or 36 inches. The exact reduction comes from the manufacturer's capacity chart, not a simple formula, because mast and truck design also matter. Lift height and forward tilt reduce the margin further, so the same load can be safe at floor level and unsafe at the top beam.
Practical load center checks in the warehouse
- Read the nameplate for capacity, load center and lift height together.
- Push loads fully back against the load backrest before lifting.
- Watch for deep pallets, crates or long items that extend past the rated load center.
- Recheck capacity after fitting a forklift attachment, which moves the load forward and adds weight.
- For top-heavy or uneven loads, estimate where the center of gravity really is, not just the pallet midpoint.
Related Glossary Terms
Frequently Asked Questions
How do I find the load center of a pallet?
For an evenly distributed load, the load center is half the depth of the load measured along the forks from their vertical face. A uniform load on a 48 x 40 pallet carried along the 48 inch side has a 24 inch load center. If weight is concentrated toward the front or the load is stacked unevenly, the center of gravity moves and must be estimated or measured. When in doubt, treat it as farther out.
What happens if I exceed the rated load center?
The truck's actual capacity drops below the nameplate figure, and the rear wheels can lift, causing loss of steering or a forward tip-over, especially with the mast raised or tilted forward. OSHA's powered industrial truck rules require that only loads within the truck's rated capacity be handled. Check the capacity chart for the real load center, or use a truck rated for longer loads.