OSHA classifies forklifts, also known as powered industrial trucks (PITs), into seven distinct classes based on their power source, design, and primary application. Understanding these classifications is essential for selecting the right equipment, ensuring safety, and meeting training requirements.
Class I: Electric Motor Rider Trucks
Class I forklifts are battery-powered trucks where the operator rides on the machine, either seated or standing. The battery also serves as a counterweight, making these forklifts highly stable. They are zero-emission and operate quietly, making them ideal for indoor environments.
Common Types: 3-wheel and 4-wheel counterbalanced forklifts, sit-down and stand-up riders.
Best For: Indoor warehouses, food storage, loading docks, and general material handling.
Class II: Electric Motor Narrow Aisle Trucks
Class II forklifts are battery-powered trucks designed specifically to operate in tight warehouse aisles. They prioritize maneuverability and vertical reach over travel speed, making them essential for high-density storage.
Common Types: Reach trucks, order pickers, turret trucks, and side loaders.
Best For: High-density storage, narrow aisles, and tall racking.
Class III: Electric Motor Hand or Hand/Rider Trucks
Class III forklifts are compact, battery-powered equipment operated by a walking or standing operator. Designed for short moves, close-quarters work, and lighter loads, they are often hand-controlled machines.
Common Types: Electric pallet jacks, walkie stackers, and tow tractors.
Best For: Short-distance pallet transport, loading docks, and retail stockrooms.
Class IV: Internal Combustion Engine Trucks (Cushion Tires)
Class IV forklifts are powered by internal combustion engines (diesel, LPG, or gasoline) and have solid rubber cushion tires. They are designed for indoor use on smooth, flat surfaces.
Common Types: Counterbalanced cushion-tire forklifts.
Best For: Indoor warehouses, manufacturing facilities, and low-clearance aisles with smooth floors.
Class V: Internal Combustion Engine Trucks (Pneumatic Tires)
Class V forklifts are similar to Class IV but are equipped with air-filled pneumatic tires. These tires provide better traction and shock absorption on uneven surfaces, making them effective both indoors and outdoors.
Common Types: Counterbalanced pneumatic-tire forklifts.
Best For: Outdoor yards, shipping yards, recycling centers, and mixed indoor/outdoor applications.
Class VI: Electric and Internal Combustion Engine Tractors
Class VI vehicles are not designed for lifting but for towing loads. They are commonly known as tuggers and are used to pull materials rather than lift them.
Common Types: Tow tractors and sit-down riders.
Best For: Airports, assembly lines, and manufacturing plants for towing carts or trailers.
Class VII: Rough Terrain Forklift Trucks
Class VII forklifts are designed for outdoor use on unimproved natural and disturbed terrain, such as construction sites. 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), and truck-mounted (piggyback) forklifts.
Best For: Construction sites, lumber yards, and any application requiring lifting on uneven or unpaved surfaces.
The bottom line: OSHA classifies forklifts into seven classes based on power source, tire type, and application. Class I covers electric riders; Class II covers narrow aisle trucks; Class III covers pallet jacks and stackers; Class IV covers IC cushion-tire trucks; Class V covers IC pneumatic-tire trucks; Class VI covers tow tractors; and Class VII covers rough-terrain trucks. Choose based on your operating environment, load requirements, and aisle width.