Lift Sling Rigging Co., Ltd manufactures the endless braided coupling rope, the article this catalogue also names Fully Braided Seamless Endless Nylon Rope. Read the two names together and one word in them is doing something different from every other word. The rest describe the rope: how it is built, what shape it has, what it is made from. That one word describes a job somebody does with it. It is also the only word in either name that this catalogue has never used anywhere else among its more than a hundred product pages, which is why this page spends most of its length on it.

Endless Braided Coupling Rope

1. The Words in the Name, and the One That Is Not a Rope Word

A rope name normally answers four questions at once: what the rope is made from, how it is built, what shape it has, and what it is for. The name on this page answers the first three and then reaches outside the rope trade for the fourth. That is worth noticing before anything else, because the fourth word is the only one in the name that a buyer cannot check against the article in front of him.

Between the two names this product carries there are six words. Five of them describe the rope; one describes a duty.

The five descriptive words are ordinary rope words, and this catalogue uses them on other pages. Coupling is not a rope word at all. It comes from the safety-net trade, and it is worth following it back there, because the trade it comes from attaches figures to the word that a buyer could easily carry across by mistake.

A safety net is held in place by more than one rope, and the net standard names those ropes by the job each one does.

Those figures are clause 7.5 of the safety-net standard EN 1263-1, and they are printed here for one reason only: they are where the word comes from. They are requirements on a net, not properties of the rope on this page. Note what the net trade itself does with its own word: its coupling rope is allowed to be a quarter of its border rope, because a coupling rope carries the seam between two nets rather than the edge of a net. Nothing in this catalogue follows that standard. This catalogue names no rope standard at all, and this page prints no strength figure for this rope. If a strength is what you need, Section 10 lists what has to be on the order before we will put a figure against it.

Outside the net trade the same word is used loosely for any short rope that joins two things, and that looseness is the difficulty with it. A shackle is a coupling. So is a master link, and so is a swivel. Each of those is a connector with a known capacity, while coupling rope as a phrase carries no capacity with it whatever. The reliable action for a buyer is therefore not to lean on the word but to state the duty: what is being joined to what, what the joint has to hold, and what the loop has to pass over on the way. That is the difference between an enquiry we can answer with a figure and an enquiry we can answer only with a shape.

One consequence of the word decides which page of this catalogue is the right page, and it is worth setting down. A sling is arranged around a load: it takes the load at one point and hands it to a hook. A coupling is arranged between two things. This article is the rope form of a connector, which is why the page is named a coupling rope and not a coupling sling, and why the word rather than the rope has taken the first section of this page.

2. What the Article Is, as Far as the Photographs Go

The rope itself is the easy part. It is a braid, it is closed on itself, and there is nothing on it but the braid: no splice, no stitching, no whipping, no ferrule, no thimble, no sleeve and no metal of any kind. Section 7 describes the three photographs on this page one by one. What matters here is what happens at the two turns, because a loop made in any other way would have to show something there.

That last row is what the two words endless and seamless are pointing at, and it is the strongest thing this page can say about the article. It is also the end of what a photograph can establish, and the limit is better stated precisely than left implied.

A photograph can show that nothing has been added to the rope. It cannot show that nothing was done. A loop can also be closed by turning the braid back into itself so that the join is distributed through the pattern instead of being gathered at one place, and from the outside that looks the same as a loop that came off the machine already closed. Both are seamless to the eye. This page does not claim which of the two this rope is, because that is a fact about the machine rather than a fact about the article, and the person who can answer it is the one who will quote the order.

The photograph above is the form in which this article is easiest to recognise and hardest to measure. It is a loop lying flat, which means two parallel legs joined by two turns, and every dimension a buyer might ask for refers to a different part of it. That is the subject of the next section.

3. Technical Parameters: What the Sheet Loses and What It Gains When the Article Has No Ends

The other rope pages in this catalogue describe a length of rope: a coil with two ends, finished at both ends and sold by the metre. This article is not that, and the change of form does more than change the numbers on the sheet. It changes the list. Three things happen to the list at once. Some lines stop applying, because there is nothing left for them to describe. Some lines appear that a length of rope never needs. And some lines pass through untouched, because they are about the rope and not about its shape.

The table below is that movement, line by line. It is the parameter section of this page, and it is written as a comparison because on an endless article the comparison is the parameter: the first question is not what the figure is, but whether the figure exists at all.

Two of the lines that changed are worth more than the others, because they are the two that catch buyers out on an endless article: the length, and the label. The label is the smaller problem and has a simple answer, given in Section 10. The length is the larger one, and it has three answers rather than one, because a closed loop has three different lengths and not one of them is interchangeable with the others.

The first two numbers are not two readings of the same thing, and the gap between them is not a rounding error. On the flat loop in the photograph in Section 2, the overall length exceeds the inside length by about two rope diameters, because the difference between the two measurements is nothing but the thickness of the two turns. A buyer who is given one of those numbers and needs the other can move between them only if he knows the diameter. That is one reason the diameter stays on the sheet even though the article being bought is a shape.

The third number is the one people expect to get by doubling one of the first two, and it cannot be got that way. A loop laid flat has two legs and two turns. The rope in it is longer than twice the distance between the turns, because the rope has to go round each turn as well as along the legs, and it is exactly the length of the rope's own axis. There is no part of the loop that can be laid along a tape to read it. If the length of the rope is what you are buying, it has to be agreed as a figure when the order is placed, and it has to be confirmed by the method in Section 5.

This rather than any single figure is the technical difficulty of an endless article, and it can be said in one line: on a coil, the length of the rope is the length of the coil, and on a loop it is not any dimension of the loop.

4. Fully Braided and Seamless Are Two Claims About Two Different Things

The product line uses two words that are often read as one claim about quality. They are two claims about two different things, and they are made in two different places. Fully braided is a statement about the body of the rope. Seamless is a statement about the making of the loop. A rope can be fully braided and still be spliced into a loop. A loop can be seamless and still be made from a rope with a cover laid over a core. Neither word says anything about the other, and neither of them says anything about how much the rope will hold.

The three words have one thing in common and it is worth naming. Not one of them is a strength word. A rope can satisfy all three and still be a weaker rope than the next one, because strength comes from the filament, the number of strands, the angle of the braid and the amount of material in the section, and not one of those four is fixed by a name or visible in a photograph. That is the reason this page has a section on what photographs settle and a section on what an order has to name, and no section headed load.

5. The Two Figures That Survive the Change of Form: Diameter and Mass per Metre

Of everything on the parameter sheet in Section 3, two lines behave in exactly the same way on a loop as on a coil. They earn a section of their own because between them they carry every check that the buyer of an endless article can actually make.

The diameter is the first. It is read under a stated tension, for the reason that applies to every rope: a rope that is not under tension is not round, and a diameter read on a loose rope is a larger number than the same rope gives under tension. It is written as a tolerance band rather than as a single figure, for the same reason: a rope is built to a construction and not turned to a size, and a figure with no tolerance around it cannot be used to accept or to reject anything. On a loop the diameter has a second job, which a length of rope does not give it. The diameter is the whole of the difference between the overall length and the inside length of the loop, as Section 3 sets out, and it is also what decides how much of the opening the two turns consume. A loop that is comfortably large by overall length can still be too small by inside length to go over what you have in mind, and the number that reconciles the two is the diameter.

Mass per metre is the second, and it is the more useful of the two, because it is the only figure on the whole sheet that can be checked on a closed loop with nothing but a scale and without taking the article apart. Weigh the loop, divide by the length that was agreed when the order was placed, and compare the answer with the figure the order was placed against.

That check works on this article for a reason that is easy to miss, and it is the reason the check is worth having. Nothing has been taken off the rope since the figure was quoted. On a length that is cut to size and spliced, the rope that arrives is shorter than the rope that was weighed, because the splicing consumed some of it, so the same division gives an answer that has to be corrected before it means anything. On an endless article nothing is cut, so there is nothing to correct. A loop is the one form in which this check is exact.

Neither of these two figures needs the loop to be understood before it can be used, and that is what makes them the two to keep. Every other figure on the sheet is a figure about a shape, and a figure about a shape can only be checked by measuring that shape.

6. Where a Rope Like This Is Used, and Where the Name Stops Being Useful

The trade the word comes from uses a rope of this kind for one thing: joining two nets. A net is made in sizes, a large working area needs several of them, and each neighbouring pair is joined along its edges by threading a coupling rope through the edge meshes of both, so that the separate nets become one working surface with a seam across it. Two conditions belong to that job, and both of them are geometric rather than metallurgical. The seam has to be closed, because the requirement the net trade sets on a connection is a limit on the gap it may leave, and the coupling rope is what closes it. And the rope has to follow the mesh the whole way, which means the loop it forms is not a fixed oval at all but a running series of loops along the seam.

That second condition explains the endless form better than any general argument about loops. A coupling rope is threaded through the edge mesh of one net and then the edge mesh of the next, along the seam, and a long seam is a great many repetitions of that. An article with an eye at each end would have to be introduced end first and worked along the whole seam from one end to the other, and it could not be taken off again without being unthreaded the same way. A closed loop can be started anywhere and finished anywhere, because it has no end that has to be passed through anything first. The seam is also opened and closed every time the net is rigged and struck, so the article is one that is made and unmade repeatedly rather than installed once and left.

The same property is what makes the form useful outside the net trade. Wherever a loop has to go round something and hold, and wherever there is no room to introduce an end or to fit a termination, a seamless loop is the article that will do the job. The ordinary uses are the ones that follow from that: a link between two eyes that has to be made and released often, a traveller running along a rail or a wire, a loop dropped over a bollard or a cleat, and a lashing that is left in place while the thing it holds is replaced. In every one of those the article is chosen for its shape, and its shape is the one thing the photographs on this page can prove.

Where the name stops being useful is the moment a figure is wanted. Coupling says what the article does. It does not say how much, it does not say from what, and it does not say what it was tested against. That is not a defect in the word; it is what the word is for. A buyer who has a figure in front of him has already left the word behind and is asking about a rope, which is the question Section 10 is written for.

7. What the Photographs on This Page Settle, and What They Cannot

Three photographs of this product were taken by the maker. They are worth describing in order, because each one is evidence of a different kind, and the set of things they prove is smaller than it looks.

The first is the rope laid out in a serpentine on a dark speckled stone floor, four passes visible, photographed from above. It is the only one of the three that shows a length of braid long enough to read the pattern along: a regular over and under braid with a raised crown at every crossing, and no sign of any layer above the braid. There is no printing, no stencil and no stamp anywhere on the rope in the frame, of the kind that would carry a length, a batch number or a standard number.

The second is a looser coil of the same rope on a plain white background, photographed slightly off square with the coil standing in two overlapping turns. It shows the same surface with less shadow, and shadow matters for one particular reason: a rope with a cover over a core has a seam where the cover closes, and a hard-edged photograph is where such a seam shows. There is none.

The third is the form the article is sold in, and it is the photograph in Section 2: the rope closed into a long flat loop, photographed on a paved surface, the braid running through both turns without a change in the pattern, without a thickening and with nothing attached.

Between them the three settle a short and definite list. That the body of the article is a braid and that the braid is the surface of the rope. That no splice, stitch, sleeve, ferrule, thimble, tape or knot is visible at either turn of the loop or anywhere along the braid. That the rope presents a uniform white surface. And that there is no printed marking on the rope itself, which is what makes the question of the label in Section 8 a real question rather than a formality.

What they cannot settle is a longer list, and it is the more useful one to have written down.

Every line in that table is something a buyer might reasonably want, and every one of them has to come from the order and from the record rather than from the page. That is not a limitation of this particular set of photographs; it is what photographs of rope are, and it is why Section 10 exists.

8. Handling, Storage and the Record for a Loop

On a finished length of rope the inspection points are the ends: the splice, the eye, the ferrule and the sleeve are where use is concentrated and where a fault is found first. This article has none of those, so the inspection points move, and they are worth naming once so that nobody inspects a loop by looking at the middle and calling it done.

Storage follows from the material rather than from the form, and that argument belongs to the fibre pages of this catalogue, which Section 9 links to. Two points are specific to a loop and are worth the space here. A loop kept hanging on a hook holds a bend at one place for as long as it is stored, and that is where it will first go stiff; a loop is better stored flat, or on a drum large enough that the bend is gentle. And a loop that arrives coiled takes a set from the coil: laid out for measuring, it will still be trying to coil up, which is one reason the three lengths in Section 3 are read with the loop laid flat and left to settle rather than read the moment it comes out of the bag.

The record is the last of the three and the easiest to lose, because the article has no end to carry it. Ask what will travel with the delivery: the length of the loop together with the basis on which that length was agreed, the diameter with the tension it was stated at and the tolerance band around it, the mass per metre, the fibre, and whatever test figures the order calls for. On a length of rope the record decorates the delivery. On a loop the record is the only way the loop can be identified at all once the label has gone.

One point belongs with the record rather than with the rope. A label tied through a braid can chafe the rope it is tied to, and a label supplied loose in the bag is attached to nothing. The first is the smaller of the two risks and the second is the smaller of the two conveniences, and Section 10 says which one to ask for on the order.

9. Where the Rest of This Subject Is Argued

A page about a rope with no ends can only be about half of the subject, because the other half is what a rope with ends is. This catalogue covers that half elsewhere, and the pages below are the ones that carry it. Each of them is a page with figures on it, and each is worth reading before an order rather than after a delivery.

Two of those pages are the two ends of this one, and it is worth saying which. The nylon page carries the fibre argument: if what you need to know is what polyamide does under water, heat, alkali or sunlight, that argument is there and this page does not repeat it. The life safety rope page carries the argument about ends: what a finished end is, what an eye is, and what a fitting contributes to an article. This page is the case in which all of that is absent. Read the three together and the catalogue has covered a rope on both sides of the only structural question that changes the specification sheet, which is whether the article has ends.

10. What an Order Has to Name

Everything this page has declined to print is printed by the order instead. The list below is that order, line by line. It is longer than the list for a plain length of rope, and the extra length is the price of the form: three of the lines exist only because the article has no ends.

Three of those eleven lines exist only because the article has no ends: the length with its basis, the label without a tail, and the record without a place to hang. The other eight would be on the order for any rope bought from this catalogue, and they are listed here so that the three do not have to be remembered separately.

11. What This Page Has Deliberately Not Said

A page that declines to print figures owes the reader the list of what it has declined, so that nothing is missing by accident.

Six of those seven have the same cause and it can be stated once rather than six times. This page is built from the name of the product, three photographs taken by the maker, and what the rest of this catalogue already measures. Everything printed on it is either visible in those photographs or consistent with the pages it links to. Where a figure was wanted and no basis for it existed, the figure was left out and the question was moved to Section 10, which is the section that can produce one.

Frequently Asked Questions

Contact Lift Sling Rigging Co., Ltd

Lift Sling Rigging Co., Ltd, Lifute Industrial Park, Taizhou City, Jiangsu Province, China. Telephone and WeChat: 18066002268. E-mail: 702461526@qq.com. HS code 630790. When you write, give us the first three lines of Section 10: which of the three lengths of the loop you mean, the diameter with the tension it is stated at and the tolerance band around it, and whether anything is to be fitted. Add the duty if there is one, and we will put a figure against it.