Forklift trucks come in many shapes and sizes, each designed for specific tasks, environments, and load types. The Occupational Safety and Health Administration (OSHA) organizes all powered industrial trucks into seven distinct classes based on power source, tire type, and application. Understanding these classifications is essential for selecting the right machine for your operation.
The 7 OSHA Forklift Classes
Class Name Power Source Tire Type Key Examples Primary Application
I Electric Motor Rider Trucks Battery (Electric) Cushion or Pneumatic 3‑wheel and 4‑wheel counterbalance, stand‑up riders Indoor warehouses, loading docks, general material handling
II Electric Motor Narrow Aisle Trucks Battery (Electric) Cushion Reach trucks, order pickers, turret trucks, side loaders High‑density storage, tight aisles, tall racking
III Electric Motor Hand or Hand/Rider Trucks Battery (Electric) Cushion Pallet jacks, walkie stackers, tow tractors Short‑distance pallet transport, loading docks, retail stockrooms
IV Internal Combustion Trucks (Cushion Tires) Diesel, LPG, Gasoline Cushion (Solid) Counterbalance cushion‑tire forklifts Indoor use on smooth, flat surfaces
V Internal Combustion Trucks (Pneumatic Tires) Diesel, LPG, Gasoline Pneumatic (Air‑filled) Counterbalance pneumatic‑tire forklifts Outdoor and indoor/outdoor use on uneven surfaces
VI Electric and IC Engine Tractors Battery or IC Engine Varies Tow tractors, sit‑down riders Towing loads in airports, assembly lines
VII Rough‑Terrain Forklift Trucks Diesel (primarily) Large Pneumatic Telescoping boom forklifts, vertical‑mast rough terrain Construction sites, lumber yards, uneven terrain
Class I: Electric Motor Rider Trucks
Class I forklifts are battery‑powered trucks where the operator rides on the machine, either seated or standing. They produce zero emissions and operate quietly, making them ideal for indoor environments. The battery also serves as part of the counterweight, contributing to stability.
Common Types:
Electric counterbalance forklifts (3‑wheel and 4‑wheel)
Stand‑up and sit‑down electric riders
3‑wheel electric forklifts
Typical Capacity: 3,000 – 40,000 lbs
Best For: Warehouses, distribution centers, manufacturing plants, and cold storage facilities.
Class II: Electric Motor Narrow Aisle Trucks
Class II forklifts are electric‑powered trucks specifically designed to operate in tight warehouse aisles. They prioritize maneuverability and vertical reach over travel speed, making them essential for high‑density storage environments.
Common Types:
Reach Trucks: Forks extend forward to reach into racking; ideal for tall racking systems
Order Pickers: Operator elevates with the forks to pick individual items from high shelves
Turret Trucks: Very narrow aisle (VNA) forklifts with rotating forks
Side Loaders: Lift and carry long loads (timber, pipes) parallel to the truck
Best For: High‑density warehouses with tall racking and defined aisle paths.
Class III: Electric Motor Hand or Hand/Rider Trucks
Class III forklifts are compact, electric‑powered equipment operated by a walking or standing operator. They are designed for short moves, close‑quarters work, and lighter loads.
Common Types:
Pallet Jacks (Pallet Trucks): Manual or electric; move pallets horizontally at ground level
Walkie Stackers: Electric pallet jacks with a mast for low‑level stacking
Tow Tractors: Electric or IC engine tractors for towing loads
Best For: Loading docks, retail stockrooms, production floors, and inside delivery trailers.
Class IV: Internal Combustion Trucks (Cushion Tires)
Class IV forklifts are powered by internal combustion engines (LPG, gasoline, or diesel) and use solid rubber cushion tires. They are designed for indoor use on smooth, flat surfaces.
Common Types:
Counterbalance cushion‑tire forklifts
Best For: Warehouses, manufacturing facilities, and indoor loading areas where ventilation supports engine‑powered equipment.
Class V: Internal Combustion Trucks (Pneumatic Tires)
Class V forklifts are similar to Class IV but equipped with air‑filled pneumatic tires, providing better traction and shock absorption on uneven surfaces.
Common Types:
Counterbalance pneumatic‑tire forklifts
Best For: Outdoor applications, lumber yards, construction sites, and mixed indoor/outdoor use.
Class VI: Electric and IC Engine Tractors
Class VI equipment includes electric and internal combustion engine tow tractors. These machines are primarily used for towing loads rather than lifting.
Common Types:
Tow tractors (electric and IC)
Sit‑down riders
Best For: Airports, assembly lines, and any application requiring towing of multiple trailers.
Class VII: Rough‑Terrain Forklift Trucks
Class VII forklifts are designed for outdoor use on unimproved natural and disturbed terrain. They feature large, tractor‑style tires and are powered almost exclusively by diesel engines.
Common Types:
Vertical‑masted rough terrain forklifts
Telescoping boom forklifts (telehandlers)
Truck/trailer mounted (piggyback) forklifts
Best For: Construction sites, lumber yards, and any application requiring lifting on uneven or unpaved surfaces.
How to Choose the Right Forklift
Indoor, smooth floors, light to medium loads: Consider Class I (Electric) or Class III (Pallet Jacks/Stackers).
Indoor, narrow aisles, high stacking: Choose Class II (Reach Trucks, Order Pickers, Turret Trucks).
Indoor, heavy loads, smooth floors: Consider Class IV (IC Cushion Tire).
Outdoor or mixed indoor/outdoor use: Choose Class V (IC Pneumatic Tire).
Rough terrain, construction, lumber yards: Select Class VII (Rough Terrain).
Towing applications: Use Class VI (Tow Tractors).
The bottom line: Forklift trucks are classified into seven OSHA classes based on power source, tire type, and application. Class I covers electric riders for general indoor use; Class II covers narrow aisle trucks for high-density storage; Class III covers pallet jacks and stackers; Class IV covers IC cushion-tire trucks for indoor smooth surfaces; Class V covers IC pneumatic-tire trucks for outdoor/mixed use; Class VI covers tow tractors; and Class VII covers rough-terrain trucks for construction and uneven ground. Choose based on your operating environment, load requirements, and aisle width.