A forklift fork is a load-bearing component rather than an accessory, and three things decide whether the pair on your truck is adequate. Length has to suit the pallet, thickness and class have to suit the truck and the load, and the heel has to still have enough metal left to carry what the rating claims. Each of the three can be checked, which is the useful part.

Start from the pallet rather than from the truck. Measure the pallet depth, then look at how far the tines enter: common industry practice is for the forks to reach roughly two-thirds to the full depth of the load, so a short fork under a deep pallet leaves the load where the fork has least support. Pallet width then sets the spacing and the width of each tine. These proportions are public reference points, and the specific requirement depends on the load and the racking.

A longer fork does not add capacity; it usually removes it. The rating assumes a load centre measured from the fork face, so extending the tines moves the centre of gravity further out and reduces what the truck can lift at that distance, the relationship explained in our answer on what load centre means on a forklift. Buying long forks to reach two pallets deep and then loading them to the original rating is one of the most common and least noticed overloads.

Thickness and class are what the fork hangs from, and they are matched rather than chosen freely. Fork classes correspond to the carriage bar and the slot, and the class fitted to a truck is set by its capacity and its carriage. Within a class, a thicker section resists bending more, which is why a fork of the correct class but a lighter section is not interchangeable with the original. Section dimensions are public reference data, and the class on your carriage decides what will fit.

The heel wears first because the bending moment is highest there and the load is concentrated. Every time a fork is dragged across a floor, the transition from the vertical shank to the horizontal tine loses a little steel, and the loss accelerates on abrasive concrete, on uneven floors, and where grit is present. A worn heel is thinner, so the remaining section carries the same load with less material, and the effect compounds quietly over years. It is also the part an operator never sees.

Rejection criteria exist so the decision is not a matter of opinion.

• Thickness loss at the heel, measured against the original section and the applicable wear limit.
• Wear at the tip, which changes how the load is picked up and can hide a bent tine.
• A change in heel angle, which indicates the fork has been overloaded.
• Cracks, particularly at the heel and around welds, which end the conversation immediately.
• Markings that can no longer be read, since an unidentified fork cannot be rated.

These are industry conventions rather than a verdict, and the final judgement belongs to a competent inspector working to the applicable standard.

Replacement is a pair decision, not a single-part purchase. Two forks that have worn differently carry differently, so the load sits unevenly and the stronger tine takes more than half. Replacing one fork of a worn pair reproduces that imbalance in a new form. Straightening a bent fork, or welding a cracked one, restores the appearance and removes nothing of the risk, which is why both are refused by anyone who understands what the fork does.

Ordering a replacement is simple if five details are given. Length, width and thickness or class, the carriage slot type and spacing, the surface treatment if the application calls for it, and the truck model the forks will hang on. A quotation for a fork described only as suitable for a three-tonne truck is a quotation for a guess. Where the original markings are gone, class and section can be established from the carriage and the truck specification.

Checks belong in the routine rather than in an annual event. The daily, weekly and monthly forklift maintenance checklist is the place to record heel thickness over time, because one measurement proves nothing and a trend proves a lot. Forks and attachments are also different things, as the forklift attachments guide sets out: a fork is the load-bearing tine, while a clamp, rotator or push-pull device changes how the load is handled. Confusing the two leads to specifying the wrong item.

The rating on the truck is only achievable with forks that match it. If capacity is the wider question, our answer on how much an electric forklift can hold explains where the limit comes from, and a published example such as the 2.5 ton electric forklift CPD25 shows the standard fork arrangement for that class. Matching the pair to the machine is the whole exercise. Send pallet dimensions through the contact page and we will check the specification against them. A fork is cheap to replace and expensive to get wrong.