Direct answer: The hitch configuration decides how much of a polyester lifting sling's rated capacity is usable and how stable the load will be. In a vertical hitch the sling carries its full rated WLL; in a choke hitch it typically carries less, because the webbing presses on itself and the load path bends; in a basket hitch the capacity can exceed the vertical rating because the load is shared across two parts, provided the load is stable and the basket does not slip. The exact factors are set by the applicable standard — EN 1492-1, EN 1492-2 and ASME B30.9 — and must be read from that source, not assumed.

Vertical, Choke and Basket: Three Basic Hitches

Almost every rigging arrangement is built from three hitches. A vertical hitch hangs the sling straight, with the eye or sling end sitting on a fitting and the load directly below. A choke hitch passes the sling around the load and through or over itself so that it grips the load when tensioned; the sling constricts the load like a lasso. A basket hitch passes the sling under the load so both parts of the sling rise to the fitting, supporting the load on a cradle of webbing.

The hitch is not a minor detail of rigging; it changes the physics of how the sling is loaded. Choosing a hitch is therefore part of choosing the sling, because the usable capacity follows from the combination.

How Each Hitch Changes Capacity

Each hitch loads the sling differently, and the resulting capacity relationship is a defining feature of rigging practice. The table below summarises the direction of each effect; the exact factors for a given sling type must be taken from the applicable standard or the manufacturer's verified rating data.

Choke Hitch: Why Capacity Falls

In a choke hitch, the polyester lifting sling grips the load by pressing against itself where the webbing crosses. Two effects reduce the usable capacity: the load path through the choke is not a straight tensile pull but a bent one, which introduces a stress concentration at the crossover, and the webbing bears against itself under high pressure, which adds wear and can cut into the sling. The choke angle — how widely the two legs of the choke open, or how close together they stay — affects the degree of the reduction, so a tight choke and a wide choke are not equivalent.

Choke hitches are valuable because they grip the load and resist slipping, which is useful for items that would otherwise slide out of a straight sling. The trade-off is that the capacity rating must reflect the choke reduction; a polyester lifting sling chosen at its vertical WLL and then used in a choke can be overloaded even if the load mass never changed. Choke hitches should also be avoided on sharp-cornered or easily damaged loads unless protected, because the gripping pressure concentrates at the choke point.

Basket Hitch: Why Capacity Rises, and Its Limits

A basket hitch supports the load on two risers of the sling, so the load is shared between them and the effective capacity is higher than the single-leg vertical rating. This makes the basket a common way to gain capacity from a given sling. The gain is real, but conditional. The load must be stable enough to sit in the cradle without tipping, and the two parts of the sling must not be able to spread or slide away from each other; if they can, the basket becomes a vertical hitch on one leg and the capacity gain disappears. Where the legs of the basket are at an angle rather than vertical, the leg angle factor applies to each part, reducing the simple capacity gain.

For round slings, which are well suited to basket and choke work because they present a soft, broad contact surface, the relevant standard is EN 1492-2. An EN 1492-2 endless-type polyester round sling rated to 10 t with a 7:1 safety factor illustrates the kind of sling that is commonly used in these configurations, and a sleeve such as this soft double round sling cover in polyester adds protection where the sling meets an edge.

Load Stability Differences Between Hitches

Capacity is only half the story; each hitch also behaves differently when the load moves. A vertical hitch allows the load to swing freely and gives no grip, so it relies entirely on the load's own stability and on the angle of the legs. A choke hitch grips and resists slipping, which is an advantage for items that might slide, but it can also damage a soft load and its grip can shift as the load settles. A basket hitch cradles the load and provides good stability across the width of the basket, but it offers little restraint along the axis of the cradle, so a load can still slide lengthwise unless restrained.

These differences decide the right hitch for a job. Long, rigid items are often best handled by a basket that cradles them, or by two vertical slings at well-chosen points; items that might slip out of a cradle are better choked; irregular loads may need a combination. The choice should follow the load's shape, its centre of gravity and how it is likely to move during the lift.

Choosing the Hitch for the Load

A workable decision sequence is: define the load's shape and centre of gravity; decide whether it will slip (which favours a choke) or needs cradling and capacity (which favours a basket); check that the chosen hitch is stable against rotation and sliding; then apply the correct capacity factor for that hitch, and the angle factor on top. Only after that should the polyester lifting sling WLL be compared with the demand on the worst-loaded part.

Frequently Asked Questions

Can I gain capacity by using a basket hitch?

Yes, a basket hitch can give more capacity than the single-leg vertical rating because the load is shared over two risers. The gain is conditional on load stability and on preventing the two sling parts from spreading, and it is cancelled if the basket collapses into a single-leg vertical pull.

Why does a choke hitch reduce capacity?

Because the webbing presses on itself at the choke point, introducing a bend and a stress concentration in the load path, and adding self-abrasion. The choke angle and the sling type determine how much capacity is lost.

Is a choke hitch safe on a sharp-edged load?

Only with protection. The gripping pressure at the choke concentrates on the load's edges, so a sharp or rough edge can cut the sling. Use edge protection or choose a different hitch and sling type for such loads.

Which hitch gives the best stability?

It depends on the load. A basket cradles a load across its width for good lateral stability but allows lengthwise movement; a choke grips against slipping; a vertical hitch gives no grip and relies on leg geometry. Match the hitch to the direction in which the load might move.

Practical Guidance for Buyers and Rigging Engineers

• Decide the hitch before the sling, because the hitch sets the usable capacity factor.
• Read the capacity factors for each hitch from the applicable standard and sling type, and apply the angle factor on top.
• Prefer a basket for stable, cradled loads where more capacity helps; use a choke for loads that would otherwise slip, with edge protection as needed.
• Confirm round sling and sleeve options on the Polyester Endless Round Sling category page, and verify their ratings for your configuration.
• Re-check stability against movement in every direction the load could take, and restrain where necessary.

The hitch is where a polyester lifting sling meets a load, and it quietly rewrites the capacity number. Choosing it deliberately, with the right factor and the right stability check, turns a rigging decision into a predictable one — and keeps the sling working inside the limit that its label actually allows.