600mm vs 1200mm Load Center: What Is the Difference?

A specification such as:

16 tons at 600 mm load center

looks very similar to:

16 tons at 1200 mm load center.

Both say 16 tons.

From a forklift design point of view, however, they are very different working conditions.

This is especially important when comparing heavy duty forklifts.

For an evenly distributed load, the load center is approximately half the load length measured in the direction of the forks.

A load that is 1,200 mm deep therefore has an approximate load center of:

1,200 ÷ 2 = 600 mm

If the forklift is rated:

16,000 kg @ 600 mm

the stated capacity applies under that specified condition.

Now consider a load that is 2,400 mm deep.

Its approximate center becomes:

2,400 ÷ 2 = 1,200 mm

This immediately changes the load moment.

A useful simplified calculation is:

Load moment = Load weight × Load center

Consider the same 16-ton load.

At 600 mm:

16,000 × 600 = 9,600,000 kg·mm

At 1,200 mm:

16,000 × 1,200 = 19,200,000 kg·mm

The cargo still weighs 16 tons.

But the load moment has doubled.

This does not mean you can use this simple formula by itself to determine the final safe forklift capacity. The manufacturer's capacity data must still be used.

It does explain why two forklifts advertised as "16 ton" may be built for very different applications.

OSHA's guidance likewise explains that large trucks are commonly rated at larger load centers because they handle physically larger loads, and operators must check the stated capacity at the rated load center.

Small warehouse forklifts mostly handle standard pallets.

Heavy duty forklifts often handle:

• Steel
• Machinery
• Concrete products
• Large molds
• Timber
• Project cargo
• Oversized industrial components

These loads can extend much farther along the forks.

For this reason, heavy duty forklift specifications are often based on larger load centers such as 600, 900, 1,200 or 1,220 mm depending on the truck and application.

Imagine two customers.

Customer A

Load weight: 16 tons
Load depth: approximately 1,200 mm
Center of gravity: approximately 600 mm

Customer B

Load weight: 16 tons
Load depth: approximately 2,400 mm
Center of gravity: approximately 1,200 mm

If both customers simply request:

"16 ton forklift"

they may receive quotations that appear similar.

But Customer B requires the forklift to handle a much larger load moment.

This can affect:

• Counterweight
• Wheelbase
• Mast
• Fork carriage
• Axles
• Overall truck weight

That difference should be reflected in the forklift configuration.

This is an important purchasing point.

Suppose a 16T @ 600mm forklift has standard 1,500 mm forks.

Installing 2,400 mm forks does not automatically make it a:

16T @ 1200mm forklift.

Longer forks allow the truck to physically reach farther under the cargo.

They do not automatically increase the truck's rated lifting capacity at the longer load center.

The actual capacity still needs to be checked.

The "load length ÷ 2" method only works as a simple approximation when weight distribution is reasonably uniform.

Industrial machinery may contain:

Heavy motors

Gearboxes

Hydraulic systems

Counterweights

at one end.

The actual center of gravity may therefore sit far away from the geometric center.

For these loads, we prefer to receive an engineering drawing showing the center-of-gravity position.

When comparing quotations, never look at tonnage alone.

Instead of:

16 Ton Forklift

compare:

16T @ 600mm

with:

16T @ 1200mm

The second part of the specification can be just as important as the first.

The difference between 600 mm and 1,200 mm is not simply another number on the specification sheet.

For the same load weight, doubling the load-center distance creates a much larger load moment.

That is why we always ask for load dimensions, even when the customer already knows the exact weight.

For heavy and oversized cargo, knowing where the load sits can be just as important as knowing how much it weighs.

References

OSHA - Powered Industrial Truck Operator Training, Load Moment and Load Center.
OSHA - Powered Industrial Trucks: Nameplate and Capacity.