The forklift carriage plate, often simply called the carriage, is the vertical steel plate at the front of a forklift that holds the forks and attachments. It serves as the structural interface between the forklift's mast and whatever tool you are using to lift loads. All forks, clamps, sideshifters, and other attachments mount directly onto this plate .
Imagine the mast as the vertical elevator. The carriage plate is the moving platform that rides up and down on that elevator. The forks are the tools that hook onto the platform. Without the carriage plate, there is no way to attach the forks to the lifting mechanism .
The "Hook-Type" Mounting System
The vast majority of forklifts use a hook-type carriage system. This simple but robust design consists of horizontal steel bars across the face of the carriage plate, one at the top and one at the bottom. The forks have matching hooks on their back that slide over these bars .
The top hook on the fork bears the full weight of the load, hanging onto the upper carriage bar. The bottom hook keeps the fork vertical and prevents it from kicking out when the load shifts. A spring-loaded locking pin secures the fork in place laterally, preventing it from sliding off the carriage during operation .
This design allows the operator to adjust the spacing between forks to fit different pallet sizes. Simply slide the forks sideways along the carriage bars and lock them into the new position. The standard position on most warehouse forklifts is 42 inches between forks, matching a standard GMA pallet.
Carriage Classes: Sizing and Capacity
Carriage plates are standardized by the Industrial Truck Association (ITA) into five mounting classes . You cannot put a Class 3 fork on a Class 2 carriage. The hooks will not align, and the capacity will be dangerously mismatched.
Class 1: 13 inches tall, for capacities under 2,200 lbs. Found on small electric pallet jacks and light-duty walkies.
Class 2: 16 inches tall, for capacities from 2,200 to 5,500 lbs. The most common size for standard 3-4k lb warehouse forklifts .
Class 3: 20 inches tall, for capacities from 5,500 to 11,000 lbs. Found on larger "industrial" forklifts used in manufacturing and heavy logistics.
Class 4: 25 inches tall, for capacities from 11,000 to 17,600 lbs.
Class 5: 28.66 inches tall, for capacities from 17,600 to 24,200 lbs .
To determine your carriage class, measure the height of the carriage plate from the top edge of the upper bar to the bottom edge of the lower bar. This measurement tells you exactly which class you need for replacement forks or attachments.
Side Plates: Connecting Carriage to Mast
On the back of the carriage plate are the side plates (sometimes called sideplate assemblies). These vertical steel plates extend rearward and connect the carriage to the mast channels via rollers.
The side plates serve a critical structural function. The side plates hold the rollers that ride inside the mast channels, allowing the carriage to move up and down smoothly . Some advanced designs shape the side plates so that the intermediate portion sits inside the mast channel, improving operator visibility by hiding the lower portion of the plate from view .
Hyster-Yale has patented side plate designs that optimize this balance between strength and visibility. The shaped side plates maintain load-bearing capacity while removing excess steel that would otherwise block the operator's sightline .
Specialized Carriage Plates
Not all carriage plates are the standard type. Different applications demand different designs .
Long Goods Fork Carriage (Type II/III): Designed for handling materials over 3 meters long, such as lumber, pipes, or steel beams. These carriages extend beyond the width of the forklift to provide stability for long loads. Their low height allows optimal use of overhead space.
Telescopic Fork Carriage: For handling excessively large or unstable long goods. These carriages can be widened telescopically to the sides and can be equipped with 2, 4, or 6 forks. The forklift must be specially designed for the high weight of this attachment.
Fork Carriage Extension: An economical alternative for infrequent long load handling. Mounts on an existing standard carriage using a quick-change system.
Floating Fork Carriage: A patented design used for handling concrete blocks. This carriage allows the forks to float laterally and vertically relative to each other, making it easier to insert forks into the irregular core holes of concrete blocks .
The Carriage Plate in Modern Forklifts
The carriage plate is the single point of contact between the forklift and its load. Every pound you lift, every attachment you use, and every bump in the warehouse floor transmits through this steel plate.
Carriage height should be measured from the top edge of the upper bar to the bottom edge of the lower bar. This measurement determines your class.
The number of carriage bars varies by class, but all classes use at least two horizontal bars, one at the top and one at the bottom, to engage the fork hooks. When replacing forks or adding attachments, match the class, verify the fork spread, and check the weight rating.
The carriage plate is the workhorse of material handling. It rides up and down the mast thousands of times per year, holds millions of pounds of cumulative load, and never gets the credit it deserves. But without it, the forks would have nothing to hang onto, and the forklift would be just a slow, heavy cart.