A forklift carriage is the load-bearing steel structure that connects the forks and attachments to the mast, allowing loads to be lifted and moved efficiently. Located between the mast and the forks, the carriage moves vertically along the mast channels via hydraulic cylinders and chains. Understanding carriage types and classes is essential for ensuring fork and attachment compatibility, maintaining safe lifting capacity, and selecting the right equipment for your operation.
ITA Carriage Classes – The Standard Classification System
The Industrial Truck Association (ITA) establishes the standard classification system for forklift carriages, governed by ISO 2328. There are five ITA carriage classes, each defined by carriage height (the distance between the top and bottom carriage bars) and maximum lifting capacity.
Class Carriage Height Lifting Capacity Typical Application
Class I 13 inches Less than 2,200 lbs Light-duty, small electric forklifts
Class II 16 inches 2,200 – 5,500 lbs Standard warehouse forklifts; most common for 3,000–5,000 lb capacity trucks
Class III 20 inches 5,500 – 10,998 lbs Medium to heavy-duty forklifts; 6,000–10,000 lb capacity range
Class IV 25 inches 11,000 – 17,600 lbs Heavy-duty industrial forklifts
Class V 28.66 – 29 inches 17,602 – 24,198 lbs Very heavy-duty forklifts, large-capacity applications
Key Points:
Class II forks are typically 4 inches wide; Class III forks are 5 inches wide
Standard fork length for both Class II and III carriages is 42 inches, suitable for 48-inch pallets
Carriage class must match fork class – forks are rated for specific carriage heights
Hook-Type vs. Shaft-Type Carriages
Beyond ITA classes, carriages are also categorized by their mounting mechanism.
Hook-Type Carriage (ITA / Hook Forks)
The most common carriage type in the material handling industry. Forks feature lugs (hooks) on the shank that hook onto the carriage bars and are secured with a locking pin. Available for standard ITA Class II and III carriages in various widths. Standardized under ANSI B56.11.4.
Shaft-Type Carriage (Pin-Mount Forks)
Forks mount on a pole (shaft) that spans the width of the carriage. Typically found on older forklifts, larger machines, fork positioning attachments, skid steers, and telehandlers. Usually custom-built with no standard dimension requirements. Used when hook-type forks are not compatible.
Specialized Carriage Types
Standard Fork Carriage (Type I)
The smallest carriage with no special features, no wider than the truck's load bed opening. Suitable for transporting pallets, rigid long goods, and cassettes with fork pockets.
Long Goods Fork Carriage (Type II and III)
Designed for transporting goods from 3 meters in length. Extends beyond the load bed opening and features a low height for optimal room height utilization. Prevents rocking or tipping of long, deflectable loads.
Telescopic Fork Carriage
Used for excessively large loads and unstable long goods. Can be telescopically widened to the sides, equipped with 2, 4, or 6 forks. Requires a specially designed forklift and mast to handle the extra weight.
Fork Carriage Extension
An economical alternative to telescopic carriages, mounted on existing standard carriages via a quick-change system. Cost-effective for infrequent handling of long goods or special attachments.
Fork Positioning Carriage
Allows the operator to adjust fork spread hydraulically without leaving the seat, accommodating different pallet and load sizes.
Sideshift Carriage
Enables the load to be shifted sideways, improving maneuverability and reducing loading times. Requires an additional hydraulic unit.
Tilt Carriage
Allows the fork carriage (including load) to be tilted independently of the mast. Reduces load sway and enables horizontal load movement at storage height.
Rotating Fork Carriage
Provides 360° rotation for handling bulky loads in tight spaces, with tilt function available for adjusting load orientation.
Hinged Carriage (Tipping Forks)
Can tilt forward 45 degrees and backward 25 degrees, with loading capacity from 2.5 to 6 tons.
How to Determine Your Forklift Carriage Class
Measure carriage height – Measure the distance between the top edge of the upper fork bar and the bottom edge of the lower fork bar
Compare to the ITA class chart – Match your measurement to the corresponding class
Check the data plate – The forklift's data plate provides the most accurate capacity information based on the entire configuration
Verify fork compatibility – Forks must match the forklift's carriage class and rated capacity
Summary
Forklift carriages are classified by five ITA classes (I–V) based on carriage height (13″ to 28.66″) and lifting capacity (under 2,200 lbs to over 24,000 lbs). The two primary mounting types are hook-type (standard ITA, most common) and shaft-type (pin-mount, custom). Specialized carriages include long goods, telescopic, fork positioning, sideshift, tilt, rotating, and hinged designs for specific applications. Always match fork class to carriage class, consult the forklift data plate for accurate capacity, and verify compatibility before purchasing forks or attachments.