Forklift & Stacker Specifications Explained Simply

There are many specifications to consider when purchasing forklifts and stackers beyond rated load. It is common to see different 2-ton stackers sold at very different prices. Procurement managers need to consider whether machines will fit in narrow warehouse aisles, lifting height, and more.
You can select suitable equipment confidently once you master core specification rules.
We use datasheets of our QSLIFT SES15 self-lifting stacker as an example for this guide.
After reading, you will learn:
- What common technical parameters mean
- Key data to check before buying forklifts or stackers
- Efficient methods for reading specification datasheets.

These selection tips also work for pallet trucks and standard warehouse forklifts.

1. Rated Load Capacity Rated load stands for a stacker’s standard maximum carrying weight, such as 1.0t or 1.5t.A 2-ton stacker cannot lift a full 2 tons at maximum height; you must check the load capacity chart to see how much weight it can safely handle as the mast rises.

2. Maximum Lift Height (h3) Maximum lift height means the highest lifting position of fork stackers.Common heights include 3000mm, 4500mm and 6000mm.Match lift height according to your warehouse rack height for safe stacking.

3. Lowered Mast Height (h1) Lowered mast height refers to the machine’s overall height when the mast system is fully retracted. This value determines if the machine can pass doors, containers or warehouse elevators smoothly.

4. Free Lift Height (h2) Free lift height (or free lift) describes the fork’s maximum possible height before the mast channel rises above the lowered mast height. Free lift height must be understood for maneuvering in tight spaces like low-ceiling warehouses or shipping containers.

5. Aisle Width Requirement (Ast) Ast stands for the minimum aisle width needed for 90-degree turns. To calculate the aisle width requirement, add together the equipment’s right-angle stacking width (turning radius), the load length, and the standard safe maneuvering clearance.

6. Turning Radius Turning radius controls a stacker’s flexibility in tight storage areas. A smaller turning radius allows better performance for narrow-aisle warehouses.

7. Fork Length and Width Fork size must match your regular pallet dimension. Forks that are undersized or oversized will lower safety and handling efficiency.

8. Battery Type and Capacity Choose between lithium or lead-acid batteries based on your usage frequency.Marks on the battery like 48V/560Ah show voltage and runtime capacity.

Quick Selection Checklist for Buyers
Focus on four questions before ordering your stacker:
1. Required rated load capacity
2. Required maximum lifting height
3. Aisle width & turning radius to match the warehouse layout
4. Suitable battery type (Lithium / Lead-acid)

One important reminder: rated load drops when lifting height rises. Check the exact specifications of equipment before purchasing, but common parameters are: for lift heights of 2 to 3 meters: -15% to 20% rated load reduction, fot 4 to 5 meters: -30% to 40% rated load reduction, 6+ meters: 50%+ rated load reduction.

Need further help on equipment selection or distributor cooperation? Feel free to reach out to our team.
Keep reading our other buying guides to pick ideal pallet trucks and stackers: Electric Pallet Truck vs Manual Pallet Jack: Which Is Better?