What Class Forklift Fork Do I Need?

Quick answer: measure the height of your forklift's carriage — the vertical plate the forks hang on — from the top edge of the upper bar to the bottom edge of the lower bar. 16" means Class 2, 20" means Class 3, 25" means Class 4. That single measurement tells you which forks will fit. Truck capacity confirms it: most forklifts rated up to 5,500 lb are Class 2, 5,500–11,000 lb are Class 3, and 11,000–17,600 lb are Class 4.

The ITA fork class chart

Fork classes are set by the Industrial Truck Association (ITA) under ISO 2328, so a Class 3 fork from any manufacturer fits a Class 3 carriage from any truck brand — Toyota, Hyster, Yale, CAT, Clark, and everyone else.

Class Carriage height Typical truck capacity Common truck examples
Class 1 13" Under 2,200 lb Small electric walkies
Class 2 16" 2,200 – 5,500 lb 3,000–5,000 lb warehouse trucks (the most common size in North America)
Class 3 20" 5,500 – 10,998 lb 6,000–10,000 lb cushion and pneumatic trucks
Class 4 25" 11,000 – 17,600 lb Heavy lumber, steel, and concrete yard trucks
Class 5 28.66" 17,602 – 24,198 lb Container handlers, very heavy industrial

Next Lift stocks Class 2, 3, and 4 — the three classes that cover the overwhelming majority of hook-type forklifts.

When capacity misleads you: two real-world exceptions

The capacity ranges in the chart are guidelines, and two common truck configurations break them:

  • Newer Hyster and Yale forklifts rated 10,000–11,000 lb often have a Class 4 carriage — a capacity that would normally point to Class 3. Measure before ordering.
  • 4-stage (quad) mast trucks generally run one class smaller than their capacity suggests. A 6,500–7,000 lb quad-mast forklift typically has a Class 2 carriage, not Class 3.

In both cases the carriage measurement is the truth — capacity only gets you a first guess.

How to measure your carriage in 3 steps

  1. Lower the mast fully and shut the truck off.
  2. Find the two horizontal bars on the carriage — the forks hook over the top bar and clip behind the bottom bar.
  3. Measure from the top edge of the top bar to the bottom edge of the bottom bar. That outside-to-outside distance is your carriage height: 16", 20", or 25" (small variation is normal — round to the nearest standard size).

No tape measure handy? Check the data plate (capacity plate) on the truck. A rated capacity of 5,000 lb almost always means Class 2; 8,000 lb means Class 3; 15,500 lb means Class 4 — then confirm with the tape, especially on the exception trucks above.

Full walkthrough: How to Measure Forklift Forks.

Two more things that trip people up

Fork capacity ≠ truck capacity. Forks are rated per pair at a 24" load center, and a heavy fork section can be rated above what your truck can lift. The lower number always governs — a 6,800 lb-rated pair of forks on a 5,000 lb truck still lifts 5,000 lb, per the manufacturer's data plate.

Hook mount vs. shaft mount. Everything above applies to ITA hook-type carriages. If your forks slide onto a round bar and are held by a pin instead of hanging on hooks, you have a shaft mount (pin type) setup — class doesn't apply. Measure the shaft diameter and fork spread instead, and see our shaft mount forks.

Once you know your class, pick length and section

  • Length: forks should reach at least two-thirds of the way under your longest load. 42" and 48" cover standard pallets; 60"–96" for lumber, sheet goods, and doubled pallets; we stock through 120" in standard taper.
  • Width × thickness: determined by capacity needs — thicker sections carry more. Every product page lists the pair capacity at 24" load center.
  • Taper: standard taper for general pallet work; full taper & polish when you need to slide under thin or fragile loads like plywood and lumber.

Shop by class

Every pair ships free to the lower 48 with a 1-year warranty, typically in 3–5 days. Still unsure which class you have? Email a photo of your carriage to forks@next-lift.com or call 937-387-8140 and we'll identify it same-day.

Frequently asked questions

How do I tell what class my forklift forks are?
Measure the vertical height of the carriage — from the top edge of the upper bar to the bottom edge of the lower bar. 16" is Class 2, 20" is Class 3, 25" is Class 4. You can also check your existing forks: measure the distance between the top hook and bottom hook.

Are Class 2 and Class 3 forks interchangeable?
No. The hook spacing is different, so a Class 2 fork will not mount securely on a Class 3 carriage or vice versa. Forks must match the carriage class exactly.

What class forks does a 5,000 lb forklift use?
Almost always Class 2 — trucks rated 2,200–5,500 lb typically use a 16" Class 2 carriage. Always confirm by measuring the carriage height, since mast configuration and some newer truck models can shift the class from what capacity suggests.

Do fork classes vary by forklift brand?
No. ITA classes follow ISO 2328, so they're identical across Toyota, Hyster, Yale, CAT, Clark, Crown, Komatsu, and every other major brand. Any Class 3 fork fits any Class 3 carriage.

What if my forks mount on a round shaft with a pin?
That's a shaft mount (pin type) system, and ITA classes don't apply. Measure the shaft diameter, fork spread, and drop instead — see our shaft mount fork guide.

Can I put higher-capacity forks on my forklift to lift more?
No. Fork capacity never increases truck capacity. The forklift's data plate rating always governs the maximum safe load.