A forklift load cell is a sensor that measures the weight of a load on the forks. It converts force into an electrical signal, displaying the weight on an in-cab screen. This allows operators to weigh pallets during loading without stopping at a floor scale.
How They Work
Most forklift load cells use strain gauge technology. A metal element deforms slightly under load; strain gauges bonded to it measure this deformation. The change in electrical resistance is converted into a weight reading.
Accuracy matters. High-quality load cells achieve ±0.1% to ±0.5% accuracy, which means a 5,000 lb load reads within 5 to 25 lb of true weight.
Types of Forklift Load Cells
Onboard/Integrated Systems mount directly on the forklift carriage. Strain gauge pins replace existing pivot pins, measuring force at the lift points. They are factory-installed or retrofitted. Pros: seamless operation, no extra steps for the operator. Cons: higher upfront cost.
Fork-Mounted Systems use a thin load cell cover that sits over the existing forks. The cover contains multiple load cells that measure force as the load presses down. Pros: retrofits older trucks without modifications. Cons: adds height (typically 5-6mm), which may affect pallet entry.
Tension Link Cells hang between the hook and the load. They are portable and can be moved between different forklifts or cranes. Pros: versatile, accurate (±0.1%). Cons: adds length to the lifting chain, requires headroom.
Installation: Retrofit vs. Factory
For new forklifts, integrated load cells are the cleanest option. They are factory-calibrated and require no operator procedure changes.
For existing forklifts, retrofit kits are available. The fork-mounted cover slides over the existing fork. Installation involves:
Removing the existing fork cover
Sliding the load cell cover over the fork
Securing it with set screws or spacers
Routing the signal cable to the cab display
Calibrating the system with known test weights
The fork cover uses thin sheet metal (as thin as 3.5mm) and low-profile load cells (protruding less than 3mm) to minimize added height. Multiple load cells per fork (typically 2-4) ensure even load distribution.
Why Use a Forklift Load Cell
Benefit Description
Efficiency Weigh pallets during loading/unloading, no detour to floor scales
Overload prevention Real-time weight display prevents exceeding forklift capacity
Inventory control Accurate weight data for shipping/receiving documentation
Legal compliance Some industries require weight verification for transport
Cost savings Eliminates separate weighing station and operator
Critical Considerations
Height profile: Fork-mounted covers add 5-8mm to fork height. Verify pallet clearance.
Calibration: All load cells require periodic recalibration using certified test weights. Frequency depends on usage (typically annually).
Shock protection: Load cells are sensitive to impact. Hitting pallets or dropping loads can damage sensors.
Wireless vs. wired: Wireless systems keep the cab cleaner but require battery maintenance. Wired systems are more reliable in high-interference environments.
The Bottom Line
A forklift load cell turns a standard lift truck into a mobile scale. It eliminates separate weighing stops, prevents overloads, and improves inventory accuracy. For high-volume shipping or receiving operations, the productivity gains often pay for the system within months. Choose between integrated systems (new trucks), fork-mounted retrofits (existing fleets), or portable tension links (occasional use). The right choice depends on your accuracy requirements, budget, and how much you value getting the weight right the first time.