OSHA classifies forklifts into seven distinct classes based on power source, design, and primary application. Understanding these classifications is essential for selecting the right equipment and ensuring proper operator training.
Class I: Electric Motor Rider Trucks
Battery-powered trucks where the operator rides on the machine, either seated or standing. The battery itself serves as a counterweight, making them highly stable.
Examples: 3-wheel and 4-wheel counterbalanced forklifts, sit-down and stand-up riders.
Best For: Indoor warehouses, loading docks, and general material handling.
Class II: Electric Motor Narrow Aisle Trucks
Battery-powered trucks designed specifically to operate in tight warehouse aisles. They prioritize maneuverability and vertical reach over travel speed.
Examples: 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
Compact, battery-powered equipment operated by a walking or standing operator. Designed for short moves, close-quarters work, and lighter loads.
Examples: 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)
Powered by diesel, LPG, or gasoline engines with solid rubber cushion tires. Designed for indoor use on smooth, flat surfaces.
Examples: Counterbalanced cushion-tire forklifts.
Best For: Indoor warehouses and manufacturing facilities with smooth floors.
Class V: Internal Combustion Engine Trucks (Pneumatic Tires)
Similar to Class IV but equipped with air-filled pneumatic tires, providing better traction and shock absorption on uneven surfaces.
Examples: Counterbalanced pneumatic-tire forklifts.
Best For: Outdoor applications, lumber yards, construction sites, and mixed indoor/outdoor use.
Class VI: Electric and Internal Combustion Engine Tractors
Trucks designed for towing rather than lifting loads.
Examples: Tow tractors and sit-down riders.
Best For: Airports, assembly lines, and towing multiple trailers.
Class VII: Rough Terrain Forklift Trucks
Designed for outdoor use on unimproved natural and disturbed terrain. Feature large, tractor-style tires and are powered almost exclusively by diesel engines.
Examples: Vertical-masted rough terrain forklifts, telescoping boom forklifts (telehandlers), and truck-mounted (piggyback) forklifts.
Best For: Construction sites, lumber yards, and 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.