Single Ply Eye-Eye Webbing Sling

A single ply eye-eye webbing sling is one flat woven polyester band with a stitched eye at each end – one ply, not two stitched together. It is made in 25 мм да 300 мм web width, reaching 1 т да 12 t на а 6:1 каэфіцыент бяспекі, цягнецца не больш чым 3 % на мяжы працоўнай нагрузкі, is colour coded to У 1492-1, and is supplied with effective working lengths from 0.5 м да 100 м.

The Two Words in the Name

Вока-вока is the end configuration: the band is looped back at each end and closed with rows of stitching, so it hangs from two fittings and carries between them. Single ply з'яўляецца будаваць: one layer of webbing in the load path, where a duplex or multi-ply sling stacks two or more layers and stitches through the set.

The eyes decide how the sling meets the hook and the load; the ply decides how thick the band is, how much bulk sits at the eye, and how far up the tonnage ladder one band can go. That second question is what this page is for, таму што single ply stops at 300 мм, і 300 мм 12 т пры 6:1.

Specifications

What One Ply Actually Decides

The capacity of a flat sling is set by the cross-section of load-bearing yarn, which is width x plies. One ply buys its capacity with width alone, a duplex with a second layer of the same width, a multi-ply build with several – so single ply is the simplest way to a figure, and it runs out where the web runs out, у 300 мм.

• It is the thinnest build at a given width. One layer, so it folds tighter at the eye and passes through a smaller shackle bow or a tighter choke than the same width in duplex.
• It is the lightest. Half the layers of the equivalent duplex, which matters on a long band and on a sling that a rigger carries up a ladder.
• It is the most supple. A single ply drapes over a curved surface and follows a pipe or a rolled coil instead of bridging it, so contact is better on a round load.
• It reaches 12 т пры 300 mm at 6:1. Above that the same fibre is built in multiple plies of 300-400 мм палатна, because a wider single band stops being practical to handle.
• It has one layer to cut. Кампраміс сумленны: a duplex puts a second layer between a sharp edge and the load path. Where the edge is the whole risk, the answer is a sleeve or a duplex, not a wider single ply.

Single Ply Against Duplex

Four of the five differences below are structural consequences of one layer rather than of a different fibre. None of them changes the rule that the label governs.

Ply count is not a multiplier a buyer applies by hand. Order the working load limit and the hitch; the width and the ply that reach it are stated on the drawing, and the figure printed on the band governs the lift.

Width for a Given Figure

The ladder below is the published single-ply range for flat woven polyester at 6:1. Width is not chosen freely – it follows from the figure, and the figure is the one you need per leg in the hitch you are actually using.

Read the ladder with the factor you are building to, not a single factor. At a 7:1 factor the same 300 mm web carries 10 t rather than 12 t, and the narrower widths move up one step each – 1 t needs 30 мм, 2 t needs 60 мм, 3 t needs 90 мм, 5 t needs 150 мм, 8 t needs 240 мм. The 7:1 column is published on the white flat webbing sling старонка; the full mode-factor table is on the webbing sling category page.

Minimum length follows width, not tonnage: 0.5 m from 30 мм, 1.0 m at 60-90 мм, 1.5 m at 100-150 мм, 2.0 m at 200 mm and above. These wide-band minimums are confirmed with the order.

Capacity Is Per Hitch, Not Per Tonnage

Тэг дае адну фігуру, для вертыкальнага ўздыму. Любая іншая дамоўленасць прыніжае яго, and an eye-eye sling is the build where the choke figure is most often forgotten – because both eyes look equally usable, and the simplest way to hang a bundle is to pass one end round and hook it back.

А 5 т слінг дроселі 4 t, так а 4.5 t load choked on a 5 t band is an overload, не маржа. And a choke wears at the bearing point faster than any other part of the band, which is why a sleeved eye is worth fitting there rather than replacing the sling early.

The Eye, and What It Has To Fit

The eye is sized to the fitting it will sit in, not to the load. An eye that will not pass a bow shackle is a sling that gets knotted at the quay, and an eye that is far too large is an eye that walks on the pin. Send the hook or the shackle and the eye is made to sit in it.

Шыццё з'яўляецца стыкам, and it is what makes an eye-eye band different from an endless one: the load goes into shear across the full width of the band instead of into the last row of thread. Where a load has square edges, an eye turned through 90 ступені – a reverse eye – lets the band lie flat against the corner instead of standing on its edge over it.

Даўжыня, and the Convention It Is Measured In

An eye-eye band is quoted either as the effective working length between the bearing points of the two eyes, or as the overall length including both eyes. The gap is two eye lengths – on a short band the difference between a load that hangs level and one that does not.

• Say which convention you are quoting. Effective working length is what the lift geometry needs; overall length is what the stores measure. Both are legitimate; mixing them is not.
• Eye length is part of the figure. А 3 m band with 300 mm eyes is not the same article as a 3 m band with 150 mm eyes, even where both read 3 t.
• Range. 0.5 м да 100 m in this family, with the minimum set by the width rather than by the tonnage.

The Colour Is the Capacity

У 1492-1 assigns a colour to each working load limit, гэта самая хуткая праверка на месцы: калі паласа жоўтая, гэта так 3 t, усё, што кажуць дакументы. Вышэй 10 t колер не прызначаны, because the band is too wide for colour alone to be reliable and the label carries the figure.

ASME B30.9 не выкарыстоўвае каляровую маркіроўку: the tag states the working load limit and the hitch, so never infer capacity from colour on a sling built to B30.9. An undyed white flat webbing sling sits outside the code entirely: it is specified for loads that cannot take a dye transfer.

Where a Single Ply Is the Right Order

A single ply eye-eye webbing sling is not the cheap version of a duplex; it is the right build for a set of jobs. Steel pipe is the one this page is most often bought for: a pipe pack is curved and often coated, and a supple band that follows the bundle beats a stiff one that bridges it.

Разметка, Storage and Retirement

The band of a single ply eye-eye webbing sling carries the working load limit, эфектыўная працоўная даўжыня, the factor it was built to and any reference your system needs. A printed figure and a sewn label that disagree is a contradiction, not a detail – where both exist they come off the same order line. Захоўвайце яго ў чыстым і сухім выглядзе, ад сонечнага святла, off the floor and out of grit. Polyester takes water and most common chemicals well, but strong alkalis and some solvents attack it; the working limit is around 100 °C, and these fibres fail by melting rather than by deforming politely.

Правярайце перад кожным выкарыстаннем, і фармальна з інтэрвалам, устаноўленым правіламі сайта. Любы з іх пакідае гурт на пенсіі, and none of them is repairable.

Часта задаюць пытанні

What is a single ply eye-eye webbing sling?

One flat woven polyester band, with a stitched eye at each end and a single layer of webbing in the load path. Not a duplex: nothing is stacked or stitched through a set of layers. It is the standard build from 25 мм да 300 мм палатна, carrying 1 т да 12 т пры а 6:1 фактар.

Single ply or double ply – which should I order?

Single ply for a load that needs a supple band, a slim eye on a small shackle, or the lightest sling at a given width. Duplex where a cut edge or grit is the real risk, because the second layer stands in front of the load path. Вышэй 12 t there is no single-ply answer at all: the build goes multi-ply.

How much does a single ply webbing sling hold?

Ад 1 т пры 25 мм да 12 т пры 300 mm at a 6:1 фактар, with the minimum breaking load six times the working load limit. У 7:1 тое самае 300 mm web carries 10 t. The figure printed on the band governs, and it is the vertical figure unless the label says otherwise.

Does choking reduce the capacity of an eye-eye sling?

так – каб 0.8 of the vertical figure, так а 5 т слінг дроселі 4 t. An eye-eye sling makes a choke easy to rig by passing one eye through the other, which is exactly why the reduction is so often missed on site.

How is the length measured on an eye-eye webbing sling?

Either eye to eye, which is the effective working length, or overall including both eyes. Say which one you are quoting: the gap is two eye lengths, and on a short band that is enough to make a load hang unevenly.

How big should the eyes be on a webbing sling?

Big enough to pass the shackle bow or the hook it will sit in, and not much bigger. An eye sized to the fitting sits still on the pin; an oversized eye walks along it and wears at the wrong point.

Can a single ply sling be supplied undyed or printed with our own reference?

Yes to both. An undyed band is outside the EN 1492-1 каляровы код, so the printed figure carries the capacity; and the working load limit, the length and your own part or asset number can be printed as a production instruction, in the exact string and case you send.

Request a Quotation

Send the working load per leg, the hitch and the included angle, the effective working length eye to eye, the shackle or hook the eyes must pass, and the surface the band must not mark. We come back with the width, пласт, the eye type and the labelled working load limit – on a drawing, перш чым што-небудзь саткана.

Send your sling specification for a quotation

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Спадарожныя тавары

• Polyester webbing sling – the fibre page, and the multi-ply builds above 12 t
• Heavy duty eye-eye flat web sling – the same build at high tonnage
• White flat webbing sling – the undyed band and the 7:1 ladder
• Nylon synthetic web sling – where the band must absorb a snatch
• Сьлінг з цяжкімі вушкамі – a reinforced eye for a large bow shackle
• Сьлінг з лямкі – the category, and the full mode-factor table
• Пад'ёмныя прылады – the shackles and hooks the eyes must fit
• Строп з дроту – where the environment, не нагрузка, decides
• Круглы сьлінг – for a load that must not be marked at all